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  • Why is this unwanted ">" character being displayed when displaying this PHP document in a browser?

    - by CT
    This page takes an asset id from $_GET of the url and displays some info about the asset after querying a mysql database. When I view the page in my browser there is an unwanted "" character within the page and I have no idea why. I've commented where it appears. It appears before the < table create tag right afterward. The < table tag was originally outside the php script section but I threw it in to see if it made a difference. It did not. Thank you all. I am viewing the page in Firefox. The web server is running on an Ubuntu Server 10.04 virtual machine on my laptop. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <link rel="stylesheet" type="text/css" href="style.css" /> <title>Wagman IT Asset</title> </head> <body> <div id="page"> <div id="header"> <img src="images/logo.png" /> </div> </div> <div id="content"> <div id="container"> <div id="main"> <div id="menu"> <ul> <table width="100%" border="0"> <tr> <td><li><a href="index.php">Search Assets</a></li></td> <td><li><a href="browse.php">Browse Assets</a></li></td> <td><li><a href="add_asset.php">Add Asset</a></li></td> <td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td> </tr> </table> </ul> </div> <div id="text"> <ul> <li> <h1>View Asset</h1> </li> </ul> //UNWANTED > CHARACTER APPEARS HERE <?php echo "<table width='100%' border='0' cellpadding='2'>"; //make database connect mysql_connect("localhost", "asset_db", "asset_db") or die(mysql_error()); mysql_select_db("asset_db") or die(mysql_error()); //get asset $id = $_GET["id"]; //get type of asset $sql = "SELECT asset.type From asset WHERE asset.id = $id"; $result = mysql_query($sql) or die(mysql_error()); $row = mysql_fetch_assoc($result); $type = $row['type']; switch ($type){ case "Server": $sql = " SELECT asset.id ,asset.company ,asset.location ,asset.purchase_date ,asset.purchase_order ,asset.value ,asset.type ,asset.notes ,server.manufacturer ,server.model ,server.serial_number ,server.esc ,server.user ,server.prev_user ,server.warranty FROM asset LEFT JOIN server ON server.id = asset.id WHERE asset.id = $id "; $result = mysql_query($sql); while($row = mysql_fetch_assoc($result)) { echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Asset ID:</td><td>"; $id = $row['id']; setcookie('id', $id); echo "$id</td></tr>"; echo "<tr<td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td>><td>Company:</td><td>"; $company = $row['company']; setcookie('company', $company); echo "$company</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Location:</td><td>"; $company = $row['location']; setcookie('location', $location); echo "$location</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Purchase Date:</td><td>"; $purchase_date = $row['purchase_date']; setcookie('purchase_date', $purchase_date); echo "$purchase_date</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Purchase Order:</td><td>"; $purchase_order = $row['purchase_order']; setcookie('purchase_order', $purchase_order); echo "$purchase_order</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Value:</td><td>"; $value = $row['value']; setcookie('value', $value); echo "$value</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Type:</td><td>"; $type = $row['type']; setcookie('type', $type); echo "$type</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Notes:</td><td>"; $notes = $row['notes']; setcookie('notes', $notes); echo "$notes</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Manufacturer:</td><td>"; $manufacturer = $row['manufacturer']; setcookie('manufacturer', $manufacturer); echo "$manufacturer</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Model / Description:</td><td>"; $model = $row['model']; setcookie('model', $model); echo "$model</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Serial Number / Service Tag:</td><td>"; $serial_number = $row['serial_number']; setcookie('serial_number', $serial_number); echo "$serial_number</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Express Service Code:</td><td>"; $escy = $row['esc']; setcookie('esc', $esc); echo "$esc</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>User:</td><td>"; $user = $row['user']; setcookie('user', $user); echo "$user</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Previous User:</td><td>"; $prev_user = $row['prev_user']; setcookie('prev_user', $prev_user); echo "$prev_user</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Warranty:</td><td>"; $warranty = $row['warranty']; setcookie('warranty', $warranty); echo "$warranty</td></tr></table>"; } break; case "Laptop": $sql = " SELECT asset.id ,asset.company ,asset.location ,asset.purchase_date ,asset.purchase_order ,asset.value ,asset.type ,asset.notes ,laptop.manufacturer ,laptop.model ,laptop.serial_number ,laptop.esc ,laptop.user ,laptop.prev_user ,laptop.warranty FROM asset LEFT JOIN laptop ON laptop.id = asset.id WHERE asset.id = $id "; $result = mysql_query($sql); while($row = mysql_fetch_assoc($result)) { echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Asset ID:</td><td>"; $id = $row['id']; setcookie('id', $id); echo "$id</td></tr>"; echo "<tr<td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td>><td>Company:</td><td>"; $company = $row['company']; setcookie('company', $company); echo "$company</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Location:</td><td>"; $company = $row['location']; setcookie('location', $location); echo "$location</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Purchase Date:</td><td>"; $purchase_date = $row['purchase_date']; setcookie('purchase_date', $purchase_date); echo "$purchase_date</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Purchase Order:</td><td>"; $purchase_order = $row['purchase_order']; setcookie('purchase_order', $purchase_order); echo "$purchase_order</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Value:</td><td>"; $value = $row['value']; setcookie('value', $value); echo "$value</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Type:</td><td>"; $type = $row['type']; setcookie('type', $type); echo "$type</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Notes:</td><td>"; $notes = $row['notes']; setcookie('notes', $notes); echo "$notes</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Manufacturer:</td><td>"; $manufacturer = $row['manufacturer']; setcookie('manufacturer', $manufacturer); echo "$manufacturer</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Model / Description:</td><td>"; $model = $row['model']; setcookie('model', $model); echo "$model</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Serial Number / Service Tag:</td><td>"; $serial_number = $row['serial_number']; setcookie('serial_number', $serial_number); echo "$serial_number</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Express Service Code:</td><td>"; $escy = $row['esc']; setcookie('esc', $esc); echo "$esc</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>User:</td><td>"; $user = $row['user']; setcookie('user', $user); echo "$user</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Previous User:</td><td>"; $prev_user = $row['prev_user']; setcookie('prev_user', $prev_user); echo "$prev_user</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Warranty:</td><td>"; $warranty = $row['warranty']; setcookie('warranty', $warranty); echo "$warranty</td></tr></table>"; } break; case "Desktop": $sql = " SELECT asset.id ,asset.company ,asset.location ,asset.purchase_date ,asset.purchase_order ,asset.value ,asset.type ,asset.notes ,desktop.manufacturer ,desktop.model ,desktop.serial_number ,desktop.esc ,desktop.user ,desktop.prev_user ,desktop.warranty FROM asset LEFT JOIN desktop ON desktop.id = asset.id WHERE asset.id = $id "; $result = mysql_query($sql); while($row = mysql_fetch_assoc($result)) { echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Asset ID:</td><td>"; $id = $row['id']; setcookie('id', $id); echo "$id</td></tr>"; echo "<tr<td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td>><td>Company:</td><td>"; $company = $row['company']; setcookie('company', $company); echo "$company</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Location:</td><td>"; $company = $row['location']; setcookie('location', $location); echo "$location</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Purchase Date:</td><td>"; $purchase_date = $row['purchase_date']; setcookie('purchase_date', $purchase_date); echo "$purchase_date</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Purchase Order:</td><td>"; $purchase_order = $row['purchase_order']; setcookie('purchase_order', $purchase_order); echo "$purchase_order</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Value:</td><td>"; $value = $row['value']; setcookie('value', $value); echo "$value</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Type:</td><td>"; $type = $row['type']; setcookie('type', $type); echo "$type</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Notes:</td><td>"; $notes = $row['notes']; setcookie('notes', $notes); echo "$notes</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Manufacturer:</td><td>"; $manufacturer = $row['manufacturer']; setcookie('manufacturer', $manufacturer); echo "$manufacturer</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Model / Description:</td><td>"; $model = $row['model']; setcookie('model', $model); echo "$model</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Serial Number / Service Tag:</td><td>"; $serial_number = $row['serial_number']; setcookie('serial_number', $serial_number); echo "$serial_number</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Express Service Code:</td><td>"; $escy = $row['esc']; setcookie('esc', $esc); echo "$esc</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>User:</td><td>"; $user = $row['user']; setcookie('user', $user); echo "$user</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Previous User:</td><td>"; $prev_user = $row['prev_user']; setcookie('prev_user', $prev_user); echo "$prev_user</td></tr>"; echo "<tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td>Warranty:</td><td>"; $warranty = $row['warranty']; setcookie('warranty', $warranty); echo "$warranty</td></tr></table>"; } break; } ?> </div> </div> </div> <div class="clear"></div> <div id="footer" align="center"> <p>&nbsp;</p> </div> </div> <div id="tagline"> Wagman Construction - Bridging Generations since 1902 </div> </body> </html>

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  • has_many association, nested models and callbacks

    - by fl00r
    Hi! I've got model A and model Attach. I'm editing my A form with nested attributes for :attaches. And when I am deleting all attaches from A via accepts_nested_attributes_for how can I get after_update/after_save callbacks for all of my nested models? Problem is that when I am executing callbacks in model A they are executed right AFTER model A is updated and BEFORE model Attach is updated, so I can't, for example, know if there is NO ANY attaches after I delete them all :). Look for example: my callback after_save :update_status won't work properly after I delete all of my attaches. model A after_save :update_status has_many :attaches accepts_nested_attributes_for :attaches, :reject_if => proc { |attributes| attributes['file'].blank? }, :allow_destroy => true def update_status print "\n\nOUPS! bag is empty!\n\n" if self.attaches.empty? end end model Attach belongs_to A end I am using rails 3 beta

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  • Overriding fetch in multiple spine models

    - by Adam Charnock
    I need to override Spine's @fetch() method in all of my Spine models. Currently I have code duplication as follows: TastypieEndpointMixin = fromJSON: (data) -> return unless data return Spine.Model.fromJSON(data.objects) class App.models.Position extends Spine.Model @configure 'Position', 'code', 'name' @extend Spine.Model.Ajax @extend TastypieEndpointMixin @url: '/api/v1/position/?format=json' validate: -> 'code is required' unless @code @fetch: -> defer = $.Deferred() @one "refresh", -> defer.resolve() super return defer class App.models.Player extends Spine.Model @configure 'Player', 'first_name', 'last_name', ... @extend Spine.Model.Ajax @extend TastypieEndpointMixin @url: '/api/v1/player/?format=json' @fetch: -> defer = $.Deferred() @one "refresh", -> defer.resolve() super return defer My question is: How can I create some form of parent class which contains @fetch()? I know this should be a simple problem to solve. I have tried many options (including extending Spine.Model and Spine.Model.Ajax), but nothing works and I cannot seem to get my head around it.

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  • MVC design pattern - who loads view initially

    - by enableDeepak
    This query is about MVC design pattern in general and not ASP.net MVC framework I understand in MVC (desktop application): 1. User clicks something in view 2. this is passed on to controller to manage 3. controller makes some changes in Model 4. Model calls method on view which has the logic to refresh UI Questions around these: Q1) Can controller also modify View or Model only updates View? Q2) When screen loads for the first time, there is no Model change. Then, who fetches data from model and populates view? View directly calls Model and populates itself OR controller gets data and passes to view method OR some dummy event is raised at Model which updates View?

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  • UITableView animations for a "lazy" UI design?

    - by donuts
    I have a UITableViewController that allows the user to perform editing tasks. Now, once a user has committed his change, the table view doesn't directly change the model and updates the table, rather "informs" the model what the user wants to do. The model in turn updates accordingly and then posts a notification that it has been changed. As far as I've seen, I need to begin/end updates on the tableview and in between change the model to its' final form. My changes though, are asynchronous and cannot guarantee to update the model before 'tableview endupdates' is called. Currently, each time I receive a 'model did change' notificaiton, I reload the entire table. So, how can I really make cell animations (delete/insert) work? Should the model fire a notification for each little change instead of the entire table?

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  • Cross-referencing UML models in VS 2010

    - by cheaster
    I am just starting to explore/use the UML modeling support in Visual Studio 2010 Umltimate. I have created two model projects within a single solution. Let's call them Model A and Model B. I have some data types (classes) defined in Model B. I want to use them as return types for operations in Model A. However, I cannot figure out how to make the types defined in Model B show up in Model A when attempting to set return type on an operation. Any help/suggestions would be greatly appreciated! Thanks!

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  • using ‘using’ and scope. Not try finally!

    - by Edward Boyle
    An object that implements IDisposable has, you guessed it, a Dispose() method. In the code you write you should both declare and instantiate any object that implements IDisposable with the using statement. The using statement allows you to set the scope of an object and when your code exits that scope, the object will be disposed of. Note that when an exception occurs, this will pull your code out of scope, so it still forces a Dispose() using (mObject o = new mObject()) { // do stuff } //<- out of Scope, object is disposed. // Note that you can also use multiple objects using // the using statement if of the same type: using (mObject o = new mObject(), o2 = new mObject(), o3 = new mObject()) { // do stuff } //<- out of Scope, objects are disposed. What about try{ }finally{}? It is not needed when you use the using statement. Additionally, using is preferred, Microsoft’s own documents put it this way: As a rule, when you use an IDisposable object, you should declare and instantiate it in a using statement. When I started out in .NET I had a very bad habit of not using the using statement. As a result I ran into what many developers do: #region BAD CODE - DO NOT DO try { mObject o = new mObject(); //do stuff } finally { o.Dispose(); // error - o is out of scope, no such object. } // and here is what I find on blogs all over the place as a solution // pox upon them for creating bad habits. mObject o = new mObject(); try { //do stuff } finally { o.Dispose(); } #endregion So when should I use the using statement? Very simple rule, if an object implements IDisposable, use it. This of course does not apply if the object is going to be used as a global object outside of a method. If that is the case, don’t forget to dispose of the object in code somewhere. It should be made clear that using the try{}finally{} code block is not going to break your code, nor cause memory leaks. It is perfectly acceptable coding practice, just not best coding practice in C#. This is how VB.NET developers must code, as there is no using equivalent for them to use.

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  • MVC 3 AdditionalMetadata Attribute with ViewBag to Render Dynamic UI

    - by Steve Michelotti
    A few months ago I blogged about using Model metadata to render a dynamic UI in MVC 2. The scenario in the post was that we might have a view model where the questions are conditionally displayed and therefore a dynamic UI is needed. To recap the previous post, the solution was to use a custom attribute called [QuestionId] in conjunction with an “ApplicableQuestions” collection to identify whether each question should be displayed. This allowed me to have a view model that looked like this: 1: [UIHint("ScalarQuestion")] 2: [DisplayName("First Name")] 3: [QuestionId("NB0021")] 4: public string FirstName { get; set; } 5: 6: [UIHint("ScalarQuestion")] 7: [DisplayName("Last Name")] 8: [QuestionId("NB0022")] 9: public string LastName { get; set; } 10: 11: [UIHint("ScalarQuestion")] 12: [QuestionId("NB0023")] 13: public int Age { get; set; } 14: 15: public IEnumerable<string> ApplicableQuestions { get; set; } At the same time, I was able to avoid repetitive IF statements for every single question in my view: 1: <%: Html.EditorFor(m => m.FirstName, new { applicableQuestions = Model.ApplicableQuestions })%> 2: <%: Html.EditorFor(m => m.LastName, new { applicableQuestions = Model.ApplicableQuestions })%> 3: <%: Html.EditorFor(m => m.Age, new { applicableQuestions = Model.ApplicableQuestions })%> by creating an Editor Template called “ScalarQuestion” that encapsulated the IF statement: 1: <%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl" %> 2: <%@ Import Namespace="DynamicQuestions.Models" %> 3: <%@ Import Namespace="System.Linq" %> 4: <% 5: var applicableQuestions = this.ViewData["applicableQuestions"] as IEnumerable<string>; 6: var questionAttr = this.ViewData.ModelMetadata.ContainerType.GetProperty(this.ViewData.ModelMetadata.PropertyName).GetCustomAttributes(typeof(QuestionIdAttribute), true) as QuestionIdAttribute[]; 7: string questionId = null; 8: if (questionAttr.Length > 0) 9: { 10: questionId = questionAttr[0].Id; 11: } 12: if (questionId != null && applicableQuestions.Contains(questionId)) { %> 13: <div> 14: <%: Html.Label("") %> 15: <%: Html.TextBox("", this.Model)%> 16: </div> 17: <% } %> You might want to go back and read the full post in order to get the full context. MVC 3 offers a couple of new features that make this scenario more elegant to implement. The first step is to use the new [AdditionalMetadata] attribute which, so far, appears to be an under appreciated new feature of MVC 3. With this attribute, I don’t need my custom [QuestionId] attribute anymore - now I can just write my view model like this: 1: [UIHint("ScalarQuestion")] 2: [DisplayName("First Name")] 3: [AdditionalMetadata("QuestionId", "NB0021")] 4: public string FirstName { get; set; } 5:   6: [UIHint("ScalarQuestion")] 7: [DisplayName("Last Name")] 8: [AdditionalMetadata("QuestionId", "NB0022")] 9: public string LastName { get; set; } 10:   11: [UIHint("ScalarQuestion")] 12: [AdditionalMetadata("QuestionId", "NB0023")] 13: public int Age { get; set; } Thus far, the documentation seems to be pretty sparse on the AdditionalMetadata attribute. It’s buried in the Other New Features section of the MVC 3 home page and, after showing the attribute on a view model property, it just says, “This metadata is made available to any display or editor template when a product view model is rendered. It is up to you to interpret the metadata information.” But what exactly does it look like for me to “interpret the metadata information”? Well, it turns out it makes the view much easier to work with. Here is the re-implemented ScalarQuestion template updated for MVC 3 and Razor: 1: @{ 2: object questionId; 3: ViewData.ModelMetadata.AdditionalValues.TryGetValue("QuestionId", out questionId); 4: if (ViewBag.applicableQuestions.Contains((string)questionId)) { 5: <div> 6: @Html.LabelFor(m => m) 7: @Html.TextBoxFor(m => m) 8: </div> 9: } 10: } So we’ve gone from 17 lines of code (in the MVC 2 version) to about 7-8 lines of code here. The first thing to notice is that in MVC 3 we now have a property called “AdditionalValues” that hangs off of the ModelMetadata property. This is automatically populated by any [AdditionalMetadata] attributes on the property. There is no more need for me to explicitly write Reflection code to GetCustomAttributes() and then check to see if those attributes were present. I can just call TryGetValue() on the dictionary to see if they were present. Secondly, the “applicableQuestions” anonymous type that I passed in from the calling view – in MVC 3 I now have a dynamic ViewBag property where I can just “dot into” the applicableQuestions with a nicer syntax than dictionary square bracket syntax. And there’s no problems calling the Contains() method on this dynamic object because at runtime the DLR has resolved that it is a generic List<string>. At this point you might be saying that, yes the view got much nicer than the MVC 2 version, but my view model got slightly worse.  In the previous version I had a nice [QuestionId] attribute but now, with the [AdditionalMetadata] attribute, I have to type the string “QuestionId” for every single property and hope that I don’t make a typo. Well, the good news is that it’s easy to create your own attributes that can participate in the metadata’s additional values. The key is that the attribute must implement that IMetadataAware interface and populate the AdditionalValues dictionary in the OnMetadataCreated() method: 1: public class QuestionIdAttribute : Attribute, IMetadataAware 2: { 3: public string Id { get; set; } 4:   5: public QuestionIdAttribute(string id) 6: { 7: this.Id = id; 8: } 9:   10: public void OnMetadataCreated(ModelMetadata metadata) 11: { 12: metadata.AdditionalValues["QuestionId"] = this.Id; 13: } 14: } This now allows me to encapuslate my “QuestionId” string in just one place and get back to my original attribute which can be used like this: [QuestionId(“NB0021”)]. The [AdditionalMetadata] attribute is a powerful and under-appreciated new feature of MVC 3. Combined with the dynamic ViewBag property, you can do some really interesting things with your applications with less code and ceremony.

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  • Database design and performance impact

    - by Craige
    I have a database design issue that I'm not quite sure how to approach, nor if the benefits out weigh the costs. I'm hoping some P.SE members can give some feedback on my suggested design, as well as any similar experiences they may have came across. As it goes, I am building an application that has large reporting demands. Speed is an important issue, as there will be peak usages throughout the year. This application/database has a multiple-level, many-to-many relationship. eg object a object b object c object d object b has relationship to object a object c has relationship to object b, a object d has relationship to object c, b, a Theoretically, this could go on for unlimited levels, though logic dictates it could only go so far. My idea here, to speed up reporting, would be to create a syndicate table that acts as a global many-to-many join table. In this table (with the given example), one might see: +----------+-----------+---------+ | child_id | parent_id | type_id | +----------+-----------+---------+ | b | a | 1 | | c | b | 2 | | c | a | 3 | | d | c | 4 | | d | b | 5 | | d | a | 6 | +----------+-----------+---------+ Where a, b, c and d would translate to their respective ID's in their respective tables. So, for ease of reporting all of a which exist on object d, one could query SELECT * FROM `syndicates` ... JOINS TO child and parent tables ... WHERE parent_id=a and type_id=6; rather than having a query with a join to each level up the chain. The Problem This table grows exponentially, and in a given year, could easily grow past 20,000 records for one client. Given multiple clients over multiple years, this table will VERY quickly explode to millions of records and beyond. Now, the database will, in time, be partitioned across multiple servers, but I would like (as most would) to keep the number of servers as low as possible while still offering flexibility. Also writes and updates would be exponentially longer (though possibly not noticeable to the end user) as there would be multiple inserts/updates/scans on this table to keep it in sync. Am I going in the right direction here, or am I way off track. What would you do in a similar situation? This solution seems overly complex, but allows the greatest flexibility and fastest read-operations. Sidenote 1 - This structure allows me to add new levels to the tree easily. Sidenote 2 - The database querying for this database is done through an ORM framework.

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  • SharePoint 2010 Data Retrival Techinques

    - by Jayant Sharma
    In SharePoint, we have two options to perform CRUD operation.1. using server side code2. using client side codeusing server side code, we have 1. CAML2. LINQusing client side code, we have 1. Client Object Model    1.1.      Managed Client Object Model     1.2.     Silverlight Client Object Model    1.3.     ECMA Client Object Model2. SharePoint Web Services3. ADO Data Service (based on REST Web Services)4. Using RPC Call (owssvr.dll)Which and when these options are used depend upon requirements. Every options are certain advantages and disadvantages. So, before start development of any new sharepoint project, it is important to understand the limitations of different methods.Server Object Model is used when our application is host on the same server on which sharepoint is installed. while Client Side code is used to access sharepoint from client system. In SharePoint 2010 specially Client Object Model (COM) are introduced to perform the sharepoint operations from client system. Advantage of CAML:    -  It is fast.    -  Can be use it from all kind of technology like Silverlight, or Jquery    -  You can use U2U CAML Query builder to generate CAML Query.Disadvantage Of CAML:    - Error Prone, as we can detect the error only at runtimeAdvantage of LINQ:    -  Object Oriented technique (Object Relation Model)    -  LINQ  to SharePoint provider are working with Strongly Type List Item Objects, So intellisence are present at runtime    -  No need of knowledge of CAML    -  Less Error Prone as it as it uses C# syntex.    -  You can compare two Fields of SharePoint ListDisadvantage Of LINQ:    -  List Attachment is not supported in SPMetal Tool    -  Created By, Created, Modified and Modified By Fields are not created by SPMetal Tool.    -  Custom fields are not created by SPMetal Tools    -  External Lists are not supported    -  Though at backend LINQ genenates CAML Query so it is slower than directly using CAML in Code.  Advantage of Client Object Model    -  Used to access sharepoint from client system    -  No WebServer is required at Client End    - Can use Silverlight and JavaScripts to make better and fast User experienceDisadvantage of Client Object Model    -  You cannot use RunwithEleveatedPrivilege    - Cross Site Collection query are not possible    - Lesser API's are availableADO.Net Data Services:    -  Only List based operations are possible, other type of operations are not possible.SharePoint Web Services and RPC Call:    - Previously it was used in SharePoint 2007 but after the introduction  of Client Object Model,  Microsoft recommends not to use Web Services to fetch data from SharePoint. In SharePoint 2010 it is avaliable only for backward compatibility.Ref: http://msdn.microsoft.com/en-us/library/ee539764Jayant Sharma

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  • Creating a Yes/No MessageBox in a NuGet install/uninstall script

    - by ParadigmShift
    Sometimes getting a little feedback during the install/uninstall process of a NuGet package could be really useful. Instead of accounting for all possible ways to install your NuGet package for every user, you can simplify the installation by clarifying with the user what they want. This example shows how to generate a windows yes/no message box to get input from the user in the PowerShell install or uninstall script. We’ll use the prompt on the uninstall to confirm if the user wants to delete a custom setting that the initial install placed in their configuration.  Obviously you could use the prompt in any way you want. The objects of the message box are generated similar to the controls in the code behind of a WinForm. At the beginning of your script enter this: param($installPath, $toolsPath, $package, $project)   # Set up path variables $solutionDir = Get-SolutionDir $projectName = (Get-Project).ProjectName $projectPath = Join-Path $solutionDir $projectName   ################################################################################################ # WinForm generation for prompt ################################################################################################ function Ask-Delete-Custom-Settings { [void][reflection.assembly]::loadwithpartialname("System.Windows.Forms") [Void][reflection.assembly]::loadwithpartialname("System.Drawing")   $title = "Package Uninstall" $message = "Delete the customized settings?" #Create form and controls $form1 = New-Object System.Windows.Forms.Form $label1 = New-Object System.Windows.Forms.Label $btnYes = New-Object System.Windows.Forms.Button $btnNo = New-Object System.Windows.Forms.Button   #Set properties of controls and form ############ # label1 # ############ $label1.Location = New-Object System.Drawing.Point(12,9) $label1.Name = "label1" $label1.Size = New-Object System.Drawing.Size(254,17) $label1.TabIndex = 0 $label1.Text = $message   ############# # btnYes # ############# $btnYes.Location = New-Object System.Drawing.Point(156,45) $btnYes.Name = "btnYes" $btnYes.Size = New-Object System.Drawing.Size(48,25) $btnYes.TabIndex = 1 $btnYes.Text = "Yes"   ########### # btnNo # ########### $btnNo.Location = New-Object System.Drawing.Point(210,45) $btnNo.Name = "btnNo" $btnNo.Size = New-Object System.Drawing.Size(48,25) $btnNo.TabIndex = 2 $btnNo.Text = "No"   ########### # form1 # ########### $form1.ClientSize = New-Object System.Drawing.Size(281,86) $form1.Controls.Add($label1) $form1.Controls.Add($btnYes) $form1.Controls.Add($btnNo) $form1.Name = "Form1" $form1.Text = $title #Event Handler $btnYes.add_Click({btnYes_Click}) $btnNo.add_Click({btnNo_Click}) return $form1.ShowDialog() } function btnYes_Click { #6 = Yes $form1.DialogResult = 6 } function btnNo_Click { #7 = No $form1.DialogResult = 7 } ################################################################################################ This has also wired up the click events to the form.  This is all it takes to create the message box. Now we have to actually use the message box and get the user’s response or this is all pointless.  We’ll then delete the section of the application/web configuration called <Custom.Settings> [xml] $configXmlContent = Get-Content $configFile   Write-Host "Please respond to the question in the Dialog Box." $dialogResult = Ask-Delete-Custom-Settings #6 = Yes #7 = No Write-Host "dialogResult = $dialogResult" if ($dialogResult.ToString() -eq "Yes") { Write-Host "Deleting customized settings" $customSettingsNode = $configXmlContent.configuration.Item("Custom.Settings") $configXmlContent.configuration.RemoveChild($customSettingsNode) $configXmlContent.Save($configFile) } if ($dialogResult.ToString() -eq "No") { Write-Host "Do not delete customized settings" } The part where I check if ($dialog.Result.ToString() –eq “Yes”) could just as easily check the value for either 6 or 7 (Yes or No).  I just personally decided I liked this way better.   Shahzad Qureshi is a Software Engineer and Consultant in Salt Lake City, Utah, USA His certifications include: Microsoft Certified System Engineer 3CX Certified Partner Global Information Assurance Certification – Secure Software Programmer – .NET He is the owner of Utah VoIP Store at http://www.utahvoipstore.com/ and SWS Development at http://www.swsdev.com/ and publishes windows apps under the name Blue Voice.

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  • Validate MVC 2 form using Data annotations and Linq-to-SQL, before the model binder kicks in (with D

    - by Stefanvds
    I'm using linq to SQL and MVC2 with data annotations and I'm having some problems on validation of some types. For example: [DisplayName("Geplande sessies")] [PositiefGeheelGetal(ErrorMessage = "Ongeldige ingave. Positief geheel getal verwacht")] public string Proj_GeplandeSessies { get; set; } This is an integer, and I'm validating to get a positive number from the form. public class PositiefGeheelGetalAttribute : RegularExpressionAttribute { public PositiefGeheelGetalAttribute() : base(@"\d{1,7}") { } } Now the problem is that when I write text in the input, I don't get to see THIS error, but I get the errormessage from the modelbinder saying "The value 'Tomorrow' is not valid for Geplande sessies." The code in the controller: [HttpPost] public ActionResult Create(Projecten p) { if (ModelState.IsValid) { _db.Projectens.InsertOnSubmit(p); _db.SubmitChanges(); return RedirectToAction("Index"); } else { SelectList s = new SelectList(_db.Verbonds, "Verb_ID", "Verb_Naam"); ViewData["Verbonden"] = s; } return View(); } What I want is being able to run the Data Annotations before the Model binder, but that sounds pretty much impossible. What I really want is that my self-written error messages show up on the screen. I have the same problem with a DateTime, which i want the users to write in the specific form 'dd/MM/yyyy' and i have a regex for that. but again, by the time the data-annotations do their job, all i get is a DateTime Object, and not the original string. So if the input is not a date, the regex does not even run, cos the data annotations just get a null, cos the model binder couldn't make it to a DateTime. Does anyone have an idea how to make this work?

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  • How to use NInject (or other DI / IoC container) with the model binder in ASP.NET MVC 2 ?

    - by Andrei Rinea
    Let's say I have an User entity and I would want to set it's CreationTime property in the constructor to DateTime.Now. But being a unit test adopter I don't want to access DateTime.Now directly but use an ITimeProvider : public class User { public User(ITimeProvider timeProvider) { // ... this.CreationTime = timeProvider.Now; } // ..... } public interface ITimeProvider { public DateTime Now { get; } } public class TimeProvider : ITimeProvider { public DateTime Now { get { return DateTime.Now; } } } I am using NInject 2 in my ASP.NET MVC 2.0 application. I have a UserController and two Create methods (one for GET and one for POST). The one for GET is straight forward but the one for POST is not so straight and not so forward :P because I need to mess with the model binder to tell it to get a reference of an implementation of ITimeProvider in order to be able to construct an user instance. public class UserController : Controller { [HttpGet] public ViewResult Create() { return View(); } [HttpPost] public ActionResult Create(User user) { // ... } } I would also like to be able to keep all the features of the default model binder. Any chance to solve this simple/elegant/etc? :D

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  • Combine 3 select fields and validate as one in my User model in ruby on rails 3

    - by Psychonetics
    Ok I have 3 select boxes for selecting date of birth. I have constants setup in my User model to provide months, years etc.. Anyway I can successfully validate these select boxes separately. What I want to do is combine the :day, :month and :year and store in :birthday and validate the whole date as one so I can return 1 error rather than 3 separate ones. Also doing this will make it easier to store the validated date in my birthday field in my database. Part of my form <td> <%= f.input :day, :required => false, :label => "Birthday: " , :prompt => "Day", :collection => User::DAYS %></td> <td> <%= f.input :month, :label => false, :prompt => "Month", :collection => User::MONTHS %> </td> <td> <%= f.input :year, :label => false, :prompt => "Year", :collection => User::YEAR_RANGE %> </td> Part of User model MONTHS = ["January", 1], ["February", 2], ["March", 3], ["April", 4], ["May", 5], ["June", 6], ["July", 7], ["August", 8], ["September", 9], ["October", 10], ["November", 11], ["December", 12] # finish this DAYS = 1..31 # finish this START_YEAR = Time.now.year - 106 END_YEAR = Time.now.year YEAR_RANGE = START_YEAR..END_YEAR class User < ActiveRecord::Base attr_accessor :day, :month, :year validates_presence_of :day, :message = 'What day in a month was you born?' validates_presence_of :month, :message = 'What month was you born?' validates_presence_of :year, :message = 'What is your year of birth?' end

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  • How to tell what name RIA Services/EF Model uses for Associations?

    - by Nick Gotch
    Hi, I'm working on a C#.NET 3.5 WCF RIA Services app and having an issue with my Entity Framework model. My entity Foo is mapped to a DB table and has a primary key called FooId. My Bar is mapped to a DB view. I've selectively designed this view to generate a composite key in the EF using two of the columns (by making sure they were non-nullable and the others are all nullable. This was done using NULLIF and ISNULL in the view design.) I'm able to add this view to the model with no problem but I keep running into an issue when I try to map an association between the two. Foo should contain many Bars but I keep getting the following error when I add the association: Unable to retrieve AssociationType for association 'FK_Bar_Foo' According to this page, it looks like this might work if I can properly name the association (since RIA Services looks for specific names.) I've tried several variants of names that match the pattern of other associations with no success. Does anyone know if there's a place I can look to find out what name it's looking for? Thanks,

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  • WPF Designer has bug with parsing generic control with overrided property

    - by Ivan Laktyunkin
    I've created a generic lookless control with virtual property: public abstract class TestControlBase<TValue> : Control { public static readonly DependencyProperty ValueProperty; static TestControlBase() { ValueProperty = DependencyProperty.Register("Value", typeof(TValue), typeof(TestControlBase<TValue>)); } protected TestControlBase() { Focusable = false; Value = default(TValue); } public virtual TValue Value { get { return (TValue)GetValue(ValueProperty); } set { SetValue(ValueProperty, value); } } } Then I've made a control derived from it and overrided Value property: public class TestControl : TestControlBase<int> { public override int Value { get { return base.Value; } set { base.Value = value; } } } So I use it in a Window XAML: <TestControls:TestControl /> When I open window in designer all is OK, but when I put mouse cursor to this line, or to this control in designer I receive exception: Exception has been thrown by the target of an invocation. at System.RuntimeMethodHandle._InvokeMethodFast(Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner) at System.RuntimeMethodHandle.InvokeMethodFast(Object target, Object[] arguments, Signature sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner) at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks) at System.Delegate.DynamicInvokeImpl(Object[] args) at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter) at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler) Ambiguous match found. at System.RuntimeType.GetPropertyImpl(String name, BindingFlags bindingAttr, Binder binder, Type returnType, Type[] types, ParameterModifier[] modifiers) at System.Type.GetProperty(String name) at MS.Internal.ComponentModel.DependencyPropertyKind.get_IsDirect() at MS.Internal.ComponentModel.DependencyPropertyKind.get_IsAttached() at MS.Internal.ComponentModel.APCustomTypeDescriptor.GetProperties(Attribute[] attributes) at MS.Internal.ComponentModel.APCustomTypeDescriptor.GetProperties() at System.ComponentModel.TypeDescriptor.TypeDescriptionNode.DefaultExtendedTypeDescriptor.System.ComponentModel.ICustomTypeDescriptor.GetProperties() at System.ComponentModel.TypeDescriptor.GetPropertiesImpl(Object component, Attribute[] attributes, Boolean noCustomTypeDesc, Boolean noAttributes) at System.ComponentModel.TypeDescriptor.GetProperties(Object component) at MS.Internal.Model.ModelPropertyCollectionImpl.GetProperties(String propertyNameHint) at MS.Internal.Model.ModelPropertyCollectionImpl.<GetEnumerator>d__0.MoveNext() at MS.Internal.Designer.PropertyEditing.Model.ModelPropertyMerger.<GetFirstProperties>d__0.MoveNext() at MS.Internal.Designer.PropertyEditing.PropertyInspector.UpdateCategories(Selection selection) at MS.Internal.Designer.PropertyEditing.PropertyInspector.OnSelectionChangedIdle() Who know this problem? Please explain :) I have no ideas except that WPF Designer doesn't like generics. If I replace generics by Object all is OK.

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  • Why is my code returning a Null Object Refrence error when using WatIn?

    - by Fuzz Evans
    I keep getting a Null Object Refrence Error, but can't tell why. I have a CSV file that contains 100 urls. The file is read into an array called "lines". public partial class Form1 : System.Windows.Forms.Form { string[] lines; public Form1() ... private void ReadLinksIntoMemory() { //this reads the chosen csv file into our "lines" array //and splits on comma's and new lines to create new objects within the array using (StreamReader sr = new StreamReader(@"C:\temp.csv")) { //reads everything in our csv into 1 long line string fileContents = sr.ReadToEnd(); //splits the 1 long line read in into multiple objects of the lines array lines = fileContents.Split(new string[] { ",", Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries); sr.Dispose(); } } The next part is where I get the null object error. When I try to use WatIn to go to the first item in the lines array it says I'm referencing a null object. private void GoToEditLinks() { for (int i = 0; i < lines.Length; i++) { //go to each link sequentially myIE.GoTo(lines[i].ToString()); //sleep so we can make sure the page loads System.Threading.Thread.Sleep(5000); } } When I debug the code it says that the GoTo request calls lines which is null. It seems like I need to declare the array, but don't I need to tell it an exact size to do that? Example: lines = new string[10] I thought I could use the lines.Length to tell it how big to make the array but that didn't work. What is weird to me is I can use the following code without problem: //returns the accurate number of urls that were in the CSV we read in earlier txtbx1.text = lines.Length; //or //this returns the last entry in the csv, as well as the last entry in the array TextBox2.Text = lines[lines.Length - 1]; I am confused why the array clearly has items in it, they can be called to fill a text box, but when I try to call them in my for loop it says its a null reference? UPDATE: By placing my cursor on both calls to lines and pressing f12 I find they both go to the same instance. The thought next is that I am not calling ReadLinksIntoMemory in time, below is my code: private void button1_Click(object sender, EventArgs e) { button1.Enabled = false; ReadLinksIntoMemory(); GoToEditLinks(); button1.Enabled = true; } Unless I'm mistaken the code says that the ReadLinksIntoMemory method must complete before GoToEditLinks can be called? If ReadLinksIntoMemory didn't finish in time I shouldn't be able to fill my text boxes with the lines array length and/or last entry. UPDATE: Stepping into the method GoToEditLinks() I see that lines is null before it calls: myIE.GoTo(lines[i]); but when it hits the goto command the value changes from null to the url it is suppose to go to, but at that same time it gives me the null object error? UPDATE: I added a IsNullOrEmpty check method and lines array passes it without any issue. I'm beginning to think it is an issue with WatIn and the myIE.GoTo command. I think this is the stack trace/call stack? Program.exe!Program.Form1.GoToEditLinks() Line 284 C# Program.exe!Program.Form1.button1_Click(object sender, System.EventArgs e) Line 191 + 0x8 bytes C# [External Code] Program.exe!Program.Program.Main() Line 18 + 0x1d bytes C# [External Code]

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  • How do I get the collection of Model State Errors in ASP.NET MVC?

    - by Ryan Montgomery
    How do I get the collection of errors in a view? I don't want to use the Html Helper Validation Summary or Validation Message. Instead I want to check for errors and if any display them in specific format. Also on the input controls I want to check for a specific property error and add a class to the input. P.S. I'm using the Spark View Engine but the idea should be the same. So I figured I could do something like... <if condition="${ModelState.Errors.Count > 0}"> DispalyErrorSummary() </if> ....and also... <input type="text" value="${Model.Name}" class="?{ModelState.Errors["Name"] != string.empty} error" /> .... Or something like that. UPDATE My final solution looked like this: <input type="text" value="${ViewData.Model.Name}" class="text error?{!ViewData.ModelState.IsValid && ViewData.ModelState["Name"].Errors.Count() > 0}" id="Name" name="Name" /> This only adds the error css class if this property has an error.

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  • Need some help to determine the amount of recursive calls in PHP

    - by Ben Fransen
    Hi all, I've got a, I think fairly easy question, but this is bugging me for a while now. So I figured, maybe I can get some help here. Since recursive functions are always a bit tricky, and sometimes a bit unclear to me, I keep struggling to create a nice working solution to get my menudata. In one of my classes I have this function, which gives me all menu-items recursivly. The thing I want is to determine at which recursionlevel a certain object was retrieved so I can create a nicely looking HTML output with indents for the levels of nesting. public function GetObjectList($parentID = 0, $objectlist = null) { if(is_null($objectlist)) { $objectlist = new ObjectList("Model_Navigation"); } $query = MySQL::Query("SELECT * FROM `Navigation` WHERE `WebsiteID` = ".SITE_ID. " AND `LanguageID` = ".LANG_ID." AND `ParentID` = ".$parentID); while($result = MySQL::FetchAssoc($query)) { $object = new Model_Navigation(); $object->ID = $result["ID"]; $object->WebsiteID = $result["WebsiteID"]; $object->LanguageID = $result["LanguageID"]; $object->ParentID = $result["ParentID"]; $object->Name = $result["Name"]; $object->Page = Model_Page::GetObjectByID($result["PageID"]); $object->ExternalURL = $result["ExternalURL"]; $object->Index = $result["Index"]; $object->Level = [here lies my problem]; $objectlist->Add($object); self::GetObjectList($object->ID, $objectlist); } return $objectlist; } Hope to hear from you! Greetings from Holland, Ben Fransen

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  • How do I so a select input for a STI column in a Rails model?

    - by James A. Rosen
    I have a model with single-table inheritance on the type column: class Pet < ActiveRecord::Base TYPES = [Dog, Cat, Hamster] validates_presence_of :name end I want to offer a <select> dropdown on the new and edit pages: <% form_for @model do |f| %> <%= f.label :name %> <%= f.text_input :name %> <%= f.label :type %> <%= f.select :type, Pet::TYPES.map { |t| [t.human_name, t.to_s] } %> <% end %> That gives me the following error: ActionView::TemplateError (wrong argument type String (expected Module)) I read a suggestion to use an alias for the field #type since Ruby considers that a reserved word that's the same as #class. I tried both class Pet < ActiveRecord::Base ... alias_attribute :klass, :type end and class Pet < ActiveRecord::Base ... def klass self.type end def klass=(k) self.type = k end end Neither worked. Any suggestions? Oddly, it works fine on my machine (MRI 1.8.6 on RVM), but fails on the staging server (MRI 1.8.7 not on RVM).

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  • Should I remove all inheritance from my model in order to work with ria services?

    - by TimothyP
    I've posted some questions on this before, but it's different. So consider a small portion of our model: Person Customer Employee Spouse Person is the base class which has 3 classes that inherit from it. These 4 are very central in our design and link to many other entities. I could solve all the problems I'm experiencing with ria-services by removing the inheritance but that would really increase the complexety of the model. The first problem I experienced was that I couldn't query for Customers, Employees or Spouses, but someone gave me a solution, which was to add something like this to the DomainService: public IQueryable<Employee> GetEmployees() { return this.ObjectContext.People.OfType<Employee>(); } public IQueryable<Customer> GetCustomers() { return this.ObjectContext.People.OfType<Customer>(); } public IQueryable<Spouse> GetSpouses() { return this.ObjectContext.People.OfType<Spouse>(); } Next I tried something that seemed very normal to me: var employee = new Employee() { //.... left out to reduce the length of this question }; var spouse = new Spouse() { //.... left out to reduce the length of this questions }; employee.Spouse = spouse; context.People.Add(spouse); context.People.Add(employee); context.SubmitChanges(); Then I get the following exception: Cannot retrieve an entity set for the derived entity type 'Spouse'. Use EntityContainer.GetEntitySet(Type) to get the entity set for the base entity type 'Person'. Even when the spouse is already in the database, and I retreive it first I get similar exceptions. Also note that for some reason in some places "Persons" is used instead of "People"... So how do I solve this problem, what am I doing wrong and will I keep running into walls when using ria services with inheritance? I found some references on the web, all saying it works and then some DomainService code in which they suposedly changed something but no details... I'm using VS2010 RC1 + Silveright 4

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  • Can I give a different id to define Cakephp model associations?

    - by gacrux
    I have an one to many association in which a Thing can have many Statuses defined as below: Status Model: class Status extends AppModel { var $name = 'Status'; var $belongsTo = array( 'Thing' => array( 'className' => 'Thing', 'foreignKey' => 'thing_id', ); } Thing Model: class Thing extends AppModel { var $name = 'Thing'; var $belongsTo = array( // other associations ); var $hasMany = array( 'Status' => array( 'className' => 'Status', 'foreignKey' => 'thing_id', 'dependent' => false, 'order' => 'datetime DESC', 'limit' => '10', ), // other associations ); } This works OK, but I would like Thing to use a different id to connect to Status. E.g. Thing would use 'id' for all of it's other associations but use 'thing_status_id' for it's Status association. How can I best do this?

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  • How can I use a different id field for one of my CakePHP model associations?

    - by gacrux
    I have an one to many association in which a Thing can have many Statuses defined as below: Status Model: class Status extends AppModel { var $name = 'Status'; var $belongsTo = array( 'Thing' => array( 'className' => 'Thing', 'foreignKey' => 'thing_id', ); } Thing Model: class Thing extends AppModel { var $name = 'Thing'; var $belongsTo = array( // other associations ); var $hasMany = array( 'Status' => array( 'className' => 'Status', 'foreignKey' => 'thing_id', 'dependent' => false, 'order' => 'datetime DESC', 'limit' => '10', ), // other associations ); } This works OK, but I would like Thing to use a different id to connect to Status. E.g. Thing would use 'id' for all of it's other associations but use 'thing_status_id' for it's Status association. How can I best do this?

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  • Do you use Styrofoam balls to model your systems?

    - by Nick D
    [Objective-C] Do you still use Styrofoam balls to model your systems, where each ball represents a class? Tom Love: We do, actually. We've also done a 3D animation version of it, which we found to be nowhere near as useful as the Styrofoam balls. There's something about a physical, conspicuous structure hanging from the ceiling right in the middle of a development project that's regularly updated to provide not only the structure of the system that you're building, but also the current status of each one of the classes. We've done it on 19 projects the last time I've counted. One of them was 1,856 classes, which is big - actually, probably bigger than it should be. It was a big commercial project, so it needed to be somewhat big. Masterminds of Programming It is the first time I've read or heard about using styrofoam balls to model classes. Is that a commonly used technique? And, how does that sort of modeling help us to design better the system? If you have any photos to share which can show us how the classes are represented it'd be great!

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  • How do I make a grouped select box grouped by a column for a given model in Formtastic for Rails?

    - by jklina
    In my Rails project I'm using Formtastic to manage my forms. I have a model, Tags, with a column, "group". The group column is just a simple hardcoded way to organize my tags. I will post my Tag model class so you can see how it's organized class Tag < ActiveRecord::Base class Group BRAND = 1 SEASON = 2 OCCASION = 3 CONDITION = 4 SUBCATEGORY = 5 end has_many :taggings, :dependent => :destroy has_many :plaggs, :through => :taggings has_many :monitorings, :as => :monitorizable validates_presence_of :name, :group validates_uniqueness_of :name, :case_sensitive => false def self.brands(options = {}) self.all({ :conditions => { :group => Group::BRAND } }.merge(options)) end def self.seasons(options = {}) self.all({ :conditions => { :group => Group::SEASON } }.merge(options)) end def self.occasions(options = {}) self.all({ :conditions => { :group => Group::OCCASION } }.merge(options)) end def self.conditions(options = {}) self.all({ :conditions => { :group => Group::CONDITION } }.merge(options)) end def self.subcategories(options = {}) self.all({ :conditions => { :group => Group::SUBCATEGORY } }.merge(options)) end def self.non_brands(options = {}) self.all({ :conditions => [ "`group` != ? AND `group` != ?", Tag::Group::SUBCATEGORY, Tag::Group::BRAND] }.merge(options)) end end My goal is to use Formtastic to provide a grouped multiselect box, grouped by the column, "group" with the tags that are returned from the non_brands method. I have tried the following: = f.input :tags, :required => false, :as => :select, :input_html => { :multiple => true }, :collection => tags, :selected => sel_tags, :group_by => :group, :prompt => false But I receive the following error: (undefined method `klass' for nil:NilClass) Any ideas where I'm going wrong? Thanks for looking :]

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