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  • Mapping composite foreign keys in a many-many relationship, with overlapping components.

    - by Kirk Broadhurst
    I have a Page table and a View table. There is a many-many relationship between these two via a PageView table. Unfortunately all of these tables need to have composite keys (for business reasons). Page has a primary key of (PageCode, Version), View has a primary key of (ViewCode, Version). PageView obviously enough has PageCode, ViewCode, and Version. The FK to Page is (PageCode, Version) and the FK to View is (ViewCode, Version) Makes sense and works, but when I try to map this in Entity framework I get Error 3021: Problem in mapping fragments...: Each of the following columns in table PageView is mapped to multiple conceptual side properties: PageView.Version is mapped to (PageView_Association.View.Version, PageView_Association.Page.Version) So clearly enough, EF is having a complain about the Version column being a common component of the two foreign keys. Obviously I could create a PageVersion and ViewVersion column in the join table, but that kind of defeats the point of the constraint, i.e. the Page and View must have the same Version value. Has anyone encountered this, and is there anything I can do get around it? Thanks!

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  • Do entity collections and object sets implement IQueryable<T>?

    - by Chevex
    I am using Entity Framework for the first time and noticed that the entities object returns entity collections. DBEntities db = new DBEntities(); db.Users; //Users is an ObjectSet<User> User user = db.Users.Where(x => x.Username == "test").First(); //Is this getting executed in the SQL or in memory? user.Posts; //Posts is an EntityCollection<Post> Post post = user.Posts.Where(x => x.PostID == "123").First(); //Is this getting executed in the SQL or in memory? Do both ObjectSet and EntityCollection implement IQueryable? I am hoping they do so that I know the queries are getting executed at the data source and not in memory. EDIT: So apparently EntityCollection does not while ObjectSet does. Does that mean I would be better off using this code? DBEntities db = new DBEntities(); User user = db.Users.Where(x => x.Username == "test").First(); //Is this getting executed in the SQL or in memory? Post post = db.Posts.Where(x => (x.PostID == "123")&&(x.Username == user.Username)).First(); // Querying the object set instead of the entity collection. Also, what is the difference between ObjectSet and EntityCollection? Shouldn't they be the same? Thanks in advance!

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  • Is it possible to auto update only selected properties on an existent entity object without touching the others

    - by LaserBeak
    Say I have a bunch of boolean properties on my entity class public bool isActive etc. Values which will be manipulated by setting check boxes in a web application. I will ONLY be posting back the one changed name/value pair and the primary key at a time, say { isActive : true , NewsPageID: 34 } and the default model binder will create a NewsPage object with only those two properties set. Now if I run the below code it will not only update the values for the properties that have been set on the NewsPage object created by the model binder but of course also attempt to null all the other non set values for the existent entity object because they are not set on NewsPage object created by the model binder. Is it possible to somehow tell entity framework not to look at the properties that are set to null and attempt to persist those changes back to the retrieved entity object and hence database ? Perhaps there's some code I can write that will only utilize the non-null values and their property names on the NewsPage object created by model binder and only attempt to update those particular properties ? [HttpPost] public PartialViewResult SaveNews(NewsPage Np) { Np.ModifyDate = DateTime.Now; _db.NewsPages.Attach(Np); _db.ObjectStateManager.ChangeObjectState(Np, System.Data.EntityState.Modified); _db.SaveChanges(); _db.Dispose(); return PartialView("MonthNewsData"); } I can of course do something like below, but I have a feeling it's not the optimal solution. Especially considering that I have like 6 boolean properties that I need to set. [HttpPost] public PartialViewResult SaveNews(int NewsPageID, bool isActive, bool isOnFrontPage) { if (isActive != null) { //Get entity and update this property } if (isOnFontPage != null) { //Get entity and update this property } }

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  • How can I return json from my WCF rest service (.NET 4), using Json.Net, without it being a string,

    - by Samuel Meacham
    The DataContractJsonSerializer is unable to handle many scenarios that Json.Net handles just fine when properly configured (specifically, cycles). A service method can either return a specific object type (in this case a DTO), in which case the DataContractJsonSerializer will be used, or I can have the method return a string, and do the serialization myself with Json.Net. The problem is that when I return a json string as opposed to an object, the json that is sent to the client is wrapped in quotes. Using DataContractJsonSerializer, returning a specific object type, the response is: {"Message":"Hello World"} Using Json.Net to return a json string, the response is: "{\"Message\":\"Hello World\"}" I do not want to have to eval() or JSON.parse() the result on the client, which is what I would have to do if the json comes back as a string, wrapped in quotes. I realize that the behavior is correct; it's just not what I want/need. I need the raw json; the behavior when the service method's return type is an object, not a string. So, how can I have my method return an object type, but not use the DataContractJsonSerializer? How can I tell it to use the Json.Net serializer instead? Or, is there someway to directly write to the response stream? So I can just return the raw json myself? Without the wrapping quotes? Here is my contrived example, for reference: [DataContract] public class SimpleMessage { [DataMember] public string Message { get; set; } } [ServiceContract] [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)] [ServiceBehavior(InstanceContextMode = InstanceContextMode.Single)] public class PersonService { // uses DataContractJsonSerializer // returns {"Message":"Hello World"} [WebGet(UriTemplate = "helloObject")] public SimpleMessage SayHelloObject() { return new SimpleMessage("Hello World"); } // uses Json.Net serialization, to return a json string // returns "{\"Message\":\"Hello World\"}" [WebGet(UriTemplate = "helloString")] public string SayHelloString() { SimpleMessage message = new SimpleMessage() { Message = "Hello World" }; string json = JsonConvert.Serialize(message); return json; } // I need a mix of the two. Return an object type, but use the Json.Net serializer. }

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  • I am wondering how the Plural-Field generic is to be rendered in the REST OpenSocial 1.0 API specifi

    - by DaveGrahamOrg
    In the OpenSocial Data specificaiton 1.0 for a Person object (social profile data) it includes the use of a generic called Plural-Field. The spec can be found at: http://opensocial-resources.googlecode.com/svn/spec/1.0/Social-Data.xml#Person In the 1.0 data specification there is no XSD and no examples showing the use of this generic Plural-Field. After puzzeling the spec for some time I think I might understand the user of this generic. I was hoping that someone could confirm or correct my understanding. For example the accounts field is a generic Plural-Field<Account> while the activities field is Plural-Field <string>. Am I right in assuming that the result XML would look like: <accounts> <Plural-Field> <primary>true</primary> <type>ntlm</type> <value> <Account> <domain>MYDOMAIN</domain> <userid>MYDOMAIN\davegraham</userid> <username>davegraham</username> </Account> </value> </Plural-Field> <Plural-Field> <primary>false</primary> <type>claims</type> <value> <Account> <domain>i:0#.f|claimsDomain</domain> <userid>i:0#.f|claimsDomain|davegraham</userid> <username>davegraham</username> </Account> </value> </Plural-Field> </accounts> <activities> <Plural-Field> <primary>true</primary> <type>ntlm</type> <value>cycling</value> </Plural-Field> <Plural-Field> <primary>false</primary> <type>claims</type> <value>swiming</value> </Plural-Field> </activities> Am I right in my interpretation of the spec?

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  • Streaming binary data to WCF rest service gives Bad Request (400) when content length is greater than 64k

    - by Mikey Cee
    I have a WCF service that takes a stream: [ServiceContract] public class UploadService : BaseService { [OperationContract] [WebInvoke(BodyStyle=WebMessageBodyStyle.Bare, Method=WebRequestMethods.Http.Post)] public void Upload(Stream data) { // etc. } } This method is to allow my Silverlight application to upload large binary files, the easiest way being to craft the HTTP request by hand from the client. Here is the code in the Silverlight client that does this: const int contentLength = 64 * 1024; // 64 Kb var request = (HttpWebRequest)WebRequest.Create("http://localhost:8732/UploadService/"); request.AllowWriteStreamBuffering = false; request.Method = WebRequestMethods.Http.Post; request.ContentType = "application/octet-stream"; request.ContentLength = contentLength; using (var outputStream = request.GetRequestStream()) { outputStream.Write(new byte[contentLength], 0, contentLength); outputStream.Flush(); using (var response = request.GetResponse()); } Now, in the case above, where I am streaming 64 kB of data (or less), this works OK and if I set a breakpoint in my WCF method, and I can examine the stream and see 64 kB worth of zeros - yay! The problem arises if I send anything more than 64 kB of data, for instance by changing the first line of my client code to the following: const int contentLength = 64 * 1024 + 1; // 64 kB + 1 B This now throws an exception when I call request.GetResponse(): The remote server returned an error: (400) Bad Request. In my WCF configuration I have set maxReceivedMessageSize, maxBufferSize and maxBufferPoolSize to 2147483647, but to no avail. Here are the relevant sections from my service's app.config: <service name="UploadService"> <endpoint address="" binding="webHttpBinding" bindingName="StreamedRequestWebBinding" contract="UploadService" behaviorConfiguration="webBehavior"> <identity> <dns value="localhost" /> </identity> </endpoint> <host> <baseAddresses> <add baseAddress="http://localhost:8732/UploadService/" /> </baseAddresses> </host> </service> <bindings> <webHttpBinding> <binding name="StreamedRequestWebBinding" bypassProxyOnLocal="true" useDefaultWebProxy="false" hostNameComparisonMode="WeakWildcard" sendTimeout="00:05:00" openTimeout="00:05:00" receiveTimeout="00:05:00" maxReceivedMessageSize="2147483647" maxBufferSize="2147483647" maxBufferPoolSize="2147483647" transferMode="StreamedRequest"> <readerQuotas maxArrayLength="2147483647" maxStringContentLength="2147483647" /> </binding> </webHttpBinding> </bindings> <behaviors> <endpointBehaviors> <behavior name="webBehavior"> <webHttp /> </behavior> <endpointBehaviors> </behaviors> How do I make my service accept more than 64 kB of streamed post data?

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  • How to call a service operation at a REST style WCF endpoint uri?

    - by Dieter Domanski
    Hi, is it possible to call a service operation at a wcf endpoint uri with a self hosted service? I want to call some default service operation when the client enters the endpoint uri of the service. In the following sample these uris correctly call the declared operations (SayHello, SayHi): - http://localhost:4711/clerk/hello - http://localhost:4711/clerk/hi But the uri - http://localhost:4711/clerk does not call the declared SayWelcome operation. Instead it leads to the well known 'Metadata publishing disabled' page. Enabling mex does not help, in this case the mex page is shown at the endpoint uri. private void StartSampleServiceHost() { ServiceHost serviceHost = new ServiceHost(typeof(Clerk), new Uri( "http://localhost:4711/clerk/")); ServiceEndpoint endpoint = serviceHost.AddServiceEndpoint(typeof(IClerk), new WebHttpBinding(), ""); endpoint.Behaviors.Add(new WebHttpBehavior()); serviceHost.Open(); } [ServiceContract] public interface IClerk { [OperationContract, WebGet(UriTemplate = "")] Stream SayWelcome(); [OperationContract, WebGet(UriTemplate = "/hello/")] Stream SayHello(); [OperationContract, WebGet(UriTemplate = "/hi/")] Stream SayHi(); } public class Clerk : IClerk { public Stream SayWelcome() { return Say("welcome"); } public Stream SayHello() { return Say("hello"); } public Stream SayHi() { return Say("hi"); } private Stream Say(string what) { string page = @"<html><body>" + what + "</body></html>"; return new MemoryStream(Encoding.UTF8.GetBytes(page)); } } Is there any way to disable the mex handling and to enable a declared operation instead? Thanks in advance, Dieter

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  • How to overcome an apparent REST vs. DRY dilemma in rails?

    - by Chris
    A rails app I'm working on features examples of quadratic equations. Obviously, these are all of a common structure: ax^2 + bx + c = 0. I don't want to store every single example of these. I'd rather generate them from a template. Storing hundreds of possible versions of this structure seems highly wasteful and un-DRY. On the other hand, if I generate them, I can't access them again reliably as I could if they were simply multiple database objects. I'm sure there must be a way to overcome this, but I'm still learning rails and I'm obviously not grasping something here. Thanks.

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  • For REST, how do I receive posted data using PHP?

    - by netrox
    I want to set up a tiny RESTful interface for my web services using PHP. The problem is that I looked at frameworks and I cannot figure out how do I recieve the posted data without field names? For example, if a server posts data to my server, I cannot figure out how do I get it without needing the postfield (POST variables). Traditionally, with forms, people send post data with field names such as this: curl_setopt($ch, CURLOPT_POSTFIELDS, postfield=postvalue); and I would use PHP code like this: $postvalue=$_POST[postfield]; to get value of postfield but since the server posting data is not using postfield and is just sending XML, how do I get it without fields? How do I capture the XML? That's where I am lost.

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  • What is the current standard for authenticating Http requests (REST, Xml over Http)?

    - by CodeToGlory
    The standard should solve the following Authentication challenges like- Replay attacks Man in the Middle Plaintext attacks Dictionary attacks Brute force attacks Spoofing by counterfeit servers I have already looked at Amazon Web Services and that is one possibility. More importantly there seems to be two most common approaches: Use apiKey which is encoded in a similar fashion like AWS but is a post parameter to a request Use Http AuthenticationHeader and use a similar signature like AWS. Signature is typically obtained by signing a date stamp with an encrypted shared secret. This signature is therefore passed either as an apiKey or in the Http AuthenticationHeader. I would like to know weigh both the options from the community, who may have used one or more and would also like to explore other options that I am not considering. I would also use HTTPS to secure my services.

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  • REST authentication S3 like hmac sha1 signature vs symetric data encryption.

    - by coulix
    Hello stackers, I was arguing about an S3 like aproach using authorization hash with a secret key as the seed and some data on the request as the message signed with hmac sha1 (Amazon S3 way) vs an other developer supporting symetric encryption of the data with a secret key known by the emiter and the server. What are the advantage of using signed data with hmac sha1 vs symetric key other than the fact that with the former, we do not need to encrypt the username or password. What would be the hardest to break ? symetric encryption or sha1 hashing at la S3 ? If all big players are using oauth and similar without symetric key it is sure that there are obvious advantages, what are those ?

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  • Oracle Utilities Application Framework V4.1 Group Fix 4 available

    - by ACShorten
    Oracle Utilities Application Framework V4.1 Group Fix 4 is available from My Oracle Support as Patch 13523301. This Group Fix contains a number of enhancements and keeps fixes up to date to the latest patch level. The enhancements included in this Group Fix include: UI Hints - In previous group fixes of the Oracle Utilities Application Framework the infrastructure to support UI Hints was introduced. This group fix completes the release of this functionality. Prior to this enhancement, products and implementers typically would build at least one UI Map per Business Object to display and/or maintain the object. Whilst, this can be generated using the UI Map maintenance function and stored, this enhancement allows additional tags and elements to be added to the Business Object directly to allow dynamic generation of the UI Map for maintenance and viewing the object. This reduces the need to generate and build a UI Map at all for that object. This will reduce maintenance effort of maintaining the product and implementation by eliminating the need to maintain the HTML for the UI Map. This also allows lower skilled personnel to maintain the system. Help and working examples are available from the View schema attributes and node names option from the Schema Tips dashboard zone. For example: Note: For examples of the hints, refer to an of the following Business Objects F1_OutcomeStyleLookup, F1-TodoSumEmailType, F1-BOStatusReason or F1-BIGeneralMasterConfig. Setting batch log file names -  By default the batch infrastructure supplied with the Oracle Utilities Application Framework sets the name and location of the log files to set values. In Group Fix 4 a set of user exits have been added to allow implementers and partners to set their own filename and location.  Refer to the Release Notes in the download for more details.

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  • CoffeeScript Test Framework

    - by Liam McLennan
    Tonight the Brisbane Alt.NET group is doing a coding dojo. I am hoping to talk someone into pairing with me to solve the kata in CoffeeScript. CoffeeScript is an awesome language, half javascript, half ruby, that compiles to javascript. To assist with tonight’s dojo I wrote the following micro test framework for CoffeeScript: <html> <body> <div> <h2>Test Results:</h2> <p class='results' /> </div> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js" type="text/javascript"></script> <script type="text/coffeescript"> # super simple test framework test: { write: (s) -> $('.results').append(s + '<br/>') assert: (b, message...) -> test.write(if b then "pass" else "fail: " + message) tests: [] exec: () -> for t in test.tests test.write("<br/><b>$t.name</b>") t.func() } # add some tests test.tests.push { name: "First Test" func: () -> test.assert(true) } test.tests.push { name: "Another Test" func: () -> test.assert(false, "You loose") } # run them test.exec(test.tests) </script> <script type="text/javascript" src="coffee-script.js"></script> </body> </html> It’s not the prettiest, but as far as I know it is the only CoffeeScript test framework in existence. Of course, I could just use one of the javascript test frameworks but that would be no fun. To get this example to run you need the coffeescript compiler in the same directory as the page.

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  • Could Not Load Type Microsoft.Build.Framework.BuildEventContext

    Setting up a TeamCity build and got this error: C:\Program Files\MSBuild\Microsoft\VisualStudio\v9.0\TeamData\Microsoft.Data.Schema.SqlTasks.targets(80, 5): error MSB4018: The "SqlSetupDeployTask" task failed unexpectedly. System.TypeLoadException: Could not load type 'Microsoft.Build.Framework.BuildEventContext' from assembly 'Microsoft.Build.Framework, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. at Microsoft.Build.BuildEngine.TaskExecutionModule.SetBatchRequestSize() at Microsoft.Build.BuildEngine.TaskExecutionModule..ctor(EngineCallback engineCallback, TaskExecutionModuleMode moduleMode, Boolean profileExecution) at Microsoft.Build.BuildEngine.NodeManager..ctor(Int32 cpuCount, Boolean childMode, Engine parentEngine) at Microsoft.Build.BuildEngine.Engine..ctor(Int32 numberOfCpus, Boolean isChildNode, Int32 parentNodeId, String localNodeProviderParameters, BuildPropertyGroup globalProperties, ToolsetDefinitionLocations locations) at Microsoft.Build.BuildEngine.Engine.get_GlobalEngine() at Microsoft.Data.Schema.Build.DeploymentProjectBuilder.CreateDeploymentProject() at Microsoft.Data.Schema.Tasks.DBSetupDeployTask.BuildDeploymentProject(ErrorManager errors, ExtensionManager em) at Microsoft.Data.Schema.Tasks.DBSetupDeployTask.Execute() at Microsoft.Build.BuildEngine.TaskEngine.ExecuteTask(ExecutionMode howToExecuteTask, Hashtable projectItemsAvailableToTask, BuildPropertyGroup projectPropertiesAvailableToTask, Boolean& taskClassWasFound)   The usual searching didnt bring back anything useful, but I figured out that Id missed a dropdownlist in the TeamCity project setup: Originally I was using Microsoft .NET Framework 2.0 for my MSBuild task.  Changing it to 3.5 (as shown above) got me past this error (and on to the next one). Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Microsoft Sync Framework

    - by kaleidoscope
    Introduction It is a platform that enables collaboration and offline access for applications, services and devices. Sync framework features technologies and tools that enable roaming, data sharing and taking data offline. Moreover, developers can build synchronization ecosystems that integrate any application with data from any store, by using any protocol over any network. Highlights * Add sync support to new and existing applications, services and devices * Enable collaboration and offline capabilities for any application * Roam and share information form any data store, over any protocol and over any network configuration * Leverage sync capabilities exposed in Microsoft technologies to create sync ecosystems * Extend the architecture to support custom data types including files Benefits of using Sync Framework * An extensible model that lets you integrate multiple data sources into a synchronization ecosystems. * A managed API for all components and a native API for select components. * Conflict handling for automatic and custom resolution schemes. * Filters that let you synchronize a subset of data, such as only those files that contain images. * A compact and efficient metadata model that enables synchronization for virtually any participant, without significant changes to the data store: - Any data store     Add synchronization to a wide range of applications, services and devices. - Any data type     Introduce new data types to synchronize. - Any protocol     Use existing architectures and protocols to synchronize data. The transport – agnostic architecture allows integration of synchronization into a variety of protocols, including over-the-air and embedded devices. - Any network configuration     Enable synchronization for your applications, devices and services in true peer-to-peer or hub-and-spoke configurations. Easily recover from network interruptions. Reduce network traffic by efficiently selecting changes to synchronize. Technorati Tags: Anish Sharma,Microsoft Sync Framework

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  • Creating a Website Without a Framework [closed]

    - by James Jeffery
    I've been using PHP Frameworks for so long that I've actually forgot the "best practices" for create websites without one. Usually I will use Symfony, or more recently I've been using Laravel. A client wants a very simple website, but with certain parts of it dynamic. Due to the nature of the site using Wordpress, or a Framework, is out of the question. I'm a sucker for priding myself on my code, but I feel like I'm asking such a basic question that it's killing me to ask. But, what are the best practices for creating websites without a Framework? I like to live by the K.I.S.S (Keep It Simple Stupid!) method of thinking. So, my idea was to just create the .php pages that are required, do any page processing or database interaction on that page, then have the HTML below the closing PHP tag. I would have any helpers/functions in a functions.php file. This is what I remember doing way before I was using Frameworks, and to me it seems like a very old school way of doing things. I've not created a site without a Framework for literally 2+ years, so I've lost my way with the basics. Any advice would be greatly appreciated.

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  • Introducing the New Boot Framework in CE 7

    - by Kate Moss' Open Space
    CE 7 introduces a new boot loader framework, BLDR (platform\common\src\common\bldr\). Some people like its powerful and flexbility, others may feel its too complicate as a boot loader framework. Despite to the favor, it is already there; so let's take a look at its features. Unlike the previous BL framwork (CE7 still provides it in platform\common\src\common\boot\) is a monolithic library, the new framework has more architecture structure. It not only defines main body but also provides rich components, such as filesystem (BinFS/FAT), download transportations, display, logging and block devices: bios INT13, FAL, IDE, Flash ( and etc. Note that in the block device category, the FAL is for legacy FMD/FAL, Flash is for latest MSFlash. Some of you may have encountered MSFlash MDD/PDD compatible partition is hard to created in bootloader and now it provides a clean solution! (Since this is a big topic, I will introduce it in future post) Today, I am going to show you some basic helper components - Image Loading functions. When OS image stored in the block device, it can be a file format, says your NK.BIN in the FAT volume or a RAW format, says the image is programmed to a BINFS partition. For the first one you can use BootFileSystemReadBinFile (platform\common\src\common\bldr\fileSystem\utils\fileSystemReadBinFile.c) and use BootBlockLoadBinFsImage (platform\common\src\common\bldr\block\utils\loadBinFs.c) to load from a partition. Need a sample code? No problem, the BootLoaderLoadOs in platform\cepc\src\boot\bldr\loados.c just provide a perfect example.

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  • Django: How can I identify the calling view from a template?

    - by bryan
    Short version: Is there a simple, built-in way to identify the calling view in a Django template, without passing extra context variables? Long (original) version: One of my Django apps has several different views, each with its own named URL pattern, that all render the same template. There's a very small amount of template code that needs to change depending on the called view, too small to be worth the overhead of setting up separate templates for each view, so ideally I need to find a way to identify the calling view in the template. I've tried setting up the views to pass in extra context variables (e.g. "view_name") to identify the calling view, and I've also tried using {% ifequal request.path "/some/path/" %} comparisons, but neither of these solutions seems particularly elegant. Is there a better way to identify the calling view from the template? Is there a way to access to the view's name, or the name of the URL pattern? Update 1: Regarding the comment that this is simply a case of me misunderstanding MVC, I understand MVC, but Django's not really an MVC framework. I believe the way my app is set up is consistent with Django's take on MVC: the views describe which data is presented, and the templates describe how the data is presented. It just happens that I have a number of views that prepare different data, but that all use the same template because the data is presented the same way for all the views. I'm just looking for a simple way to identify the calling view from the template, if this exists. Update 2: Thanks for all the answers. I think the question is being overthought -- as mentioned in my original question, I've already considered and tried all of the suggested solutions -- so I've distilled it down to a "short version" now at the top of the question. And right now it seems that if someone were to simply post "No", it'd be the most correct answer :) Update 3: Carl Meyer posted "No" :) Thanks again, everyone.

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  • What's the next steps for moving from appengine to full django?

    - by tomcritchlow
    Hey guys, I'm super new to programming and I've been using appengine to help me learn python and general coding. I'm getting better quickly and I'm loving it all the way :) Appengine was awesome for allowing me to just dive into writing my app and getting something live that works (see http://www.7bks.com/). But I'm realising that the longer I continue to learn on appengine the more I'm constraining myself and locking myself into a single system. I'd like to move to developing on full django (since django looks super cool!). What are my next steps? To give you a feel for my level of knowledge: I'm not a unix user I'm not familiar with command line controls (I still use appengine/python completely via the appengine SDK) I've never programmed in anything other than python, anywhere other than appengine I know the word SQL, but don't know what MySQL is really or how to use it. So, specifically: What are the skills I need to learn to get up and running with full django/python? If I'm going to host somewhere else I suppose I'll need to learn some sysadmin type skills (maybe even unix?). Is there anywhere that offers easy hosting (like appengine) but that supports django? I hear such great things about heroku I'm considering switching to RoR and going there I appreciate that I'm likely not quite ready to move away from appengine just yet but I'm a fiercely passionate learner (http://www.7bks.com/blog/179001) and would love it if I knew all the steps I needed to learn so I could set about learning them. At the moment, I don't even know what the steps are I need to learn! Thank you very much. Sorry this isn't a specific programming question but I've looked around and haven't found a good how-to for someone of my level of experience and I think others would appreciate a good roadmap for the things we need to learn to get up and running. Thanks, Tom PS - if anyone is in London and fancies showing me the ropes in person that would be super awesome :)

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  • How to manage feeds with subclassed object in Django 1.2?

    - by Matteo
    Hi, I'm trying to generate a feed rss from a model like this one, selecting all the Entry objects: from django.db import models from django.contrib.sites.models import Site from django.contrib.auth.models import User from imagekit.models import ImageModel import datetime class Entry(ImageModel): date_pub = models.DateTimeField(default=datetime.datetime.now) author = models.ForeignKey(User) via = models.URLField(blank=True) comments_allowed = models.BooleanField(default=True) icon = models.ImageField(upload_to='icon/',blank=True) class IKOptions: spec_module = 'journal.icon_specs' cache_dir = 'icon/resized' image_field = 'icon' class Post(Entry): title = models.CharField(max_length=200) description = models.TextField() slug = models.SlugField(unique=True) def __unicode__(self): return self.title class Photo(Entry): alt = models.CharField(max_length=200) description = models.TextField(blank=True) original = models.ImageField(upload_to='photo/') class IKOptions: spec_module = 'journal.photo_specs' cache_dir = 'photo/resized' image_field = 'original' def __unicode__(self): return self.alt class Quote(Entry): blockquote = models.TextField() cite = models.TextField(blank=True) def __unicode__(self): return self.blockquote When I use the render_to_response in my views I simply call: def get_journal_entries(request): entries = Entry.objects.all().order_by('-date_pub') return render_to_response('journal/entries.html', {'entries':entries}) And then I use a conditional template to render the right snippets of html: {% extends "base.html" %} {% block main %} <hr> {% for entry in entries %} {% if entry.post %}[...]{% endif %}[...] But I cannot do the same with the Feed Framework in django 1.2... Any suggestion, please?

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  • How can I get sessions to work if I'm using Google App Engine + Django 1.1?

    - by user341642
    Is there a way for me to get sessions working? I know Django has built in session management, and GAE has some tools for it if you're using their watered down version of Django 0.96, but is there a way to get sessions to work if you're trying to use GAE w/ Django 1.1 (i.e. use_library() call). I assume using a db-backed session doesn't work, and a file system backed one won't work b/c we don't have access to the filesystem if we deploy to the Google production servers. This kinda worked (as in didn't crap out) when I used SessionMiddleware backed by a local-memory backed cache and a non-persistent cache (i.e. setting SESSION_ENGINE to django.contrib.sessions.backends.cache). But the session never seems to persist in this case, no matter how I set the timeouts. A new session key is generated on every page reload. Maybe this is b/c the GAE assumes complete statelessness with each request and blows away my local cache? Apologies in advance, I'm pretty new to Python. Any suggestions would be greatly appreciated.

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  • Authenticating clients in the new WCF Http stack

    - by cibrax
    About this time last year, I wrote a couple of posts about how to use the “Interceptors” from the REST starker kit for implementing several authentication mechanisms like “SAML”, “Basic Authentication” or “OAuth” in the WCF Web programming model. The things have changed a lot since then, and Glenn finally put on our hands a new version of the Web programming model that deserves some attention and I believe will help us a lot to build more Http oriented services in the .NET stack. What you can get today from wcf.codeplex.com is a preview with some cool features like Http Processors (which I already discussed here), a new and improved version of the HttpClient library, Dependency injection and better TDD support among others. However, the framework still does not support an standard way of doing client authentication on the services (This is something planned for the upcoming releases I believe). For that reason, moving the existing authentication interceptors to this new programming model was one of the things I did in the last few days. In order to make authentication simple and easy to extend,  I first came up with a model based on what I called “Authentication Interceptors”. An authentication interceptor maps to an existing Http authentication mechanism and implements the following interface, public interface IAuthenticationInterceptor{ string Scheme { get; } bool DoAuthentication(HttpRequestMessage request, HttpResponseMessage response, out IPrincipal principal);} An authentication interceptors basically needs to returns the http authentication schema that implements in the property “Scheme”, and implements the authentication mechanism in the method “DoAuthentication”. As you can see, this last method “DoAuthentication” only relies on the HttpRequestMessage and HttpResponseMessage classes, making the testing of this interceptor very simple (There is no need to do some black magic with the WCF context or messages). After this, I implemented a couple of interceptors for supporting basic authentication and brokered authentication with SAML (using WIF) in my services. The following code illustrates how the basic authentication interceptors looks like. public class BasicAuthenticationInterceptor : IAuthenticationInterceptor{ Func<UsernameAndPassword, bool> userValidation; string realm;  public BasicAuthenticationInterceptor(Func<UsernameAndPassword, bool> userValidation, string realm) { if (userValidation == null) throw new ArgumentNullException("userValidation");  if (string.IsNullOrEmpty(realm)) throw new ArgumentNullException("realm");  this.userValidation = userValidation; this.realm = realm; }  public string Scheme { get { return "Basic"; } }  public bool DoAuthentication(HttpRequestMessage request, HttpResponseMessage response, out IPrincipal principal) { string[] credentials = ExtractCredentials(request); if (credentials.Length == 0 || !AuthenticateUser(credentials[0], credentials[1])) { response.StatusCode = HttpStatusCode.Unauthorized; response.Content = new StringContent("Access denied"); response.Headers.WwwAuthenticate.Add(new AuthenticationHeaderValue("Basic", "realm=" + this.realm));  principal = null;  return false; } else { principal = new GenericPrincipal(new GenericIdentity(credentials[0]), new string[] {});  return true; } }  private string[] ExtractCredentials(HttpRequestMessage request) { if (request.Headers.Authorization != null && request.Headers.Authorization.Scheme.StartsWith("Basic")) { string encodedUserPass = request.Headers.Authorization.Parameter.Trim();  Encoding encoding = Encoding.GetEncoding("iso-8859-1"); string userPass = encoding.GetString(Convert.FromBase64String(encodedUserPass)); int separator = userPass.IndexOf(':');  string[] credentials = new string[2]; credentials[0] = userPass.Substring(0, separator); credentials[1] = userPass.Substring(separator + 1);  return credentials; }  return new string[] { }; }  private bool AuthenticateUser(string username, string password) { var usernameAndPassword = new UsernameAndPassword { Username = username, Password = password };  if (this.userValidation(usernameAndPassword)) { return true; }  return false; }} This interceptor receives in the constructor a callback in the form of a Func delegate for authenticating the user and the “realm”, which is required as part of the implementation. The rest is a general implementation of the basic authentication mechanism using standard http request and response messages. I also implemented another interceptor for authenticating a SAML token with WIF. public class SamlAuthenticationInterceptor : IAuthenticationInterceptor{ SecurityTokenHandlerCollection handlers = null;  public SamlAuthenticationInterceptor(SecurityTokenHandlerCollection handlers) { if (handlers == null) throw new ArgumentNullException("handlers");  this.handlers = handlers; }  public string Scheme { get { return "saml"; } }  public bool DoAuthentication(HttpRequestMessage request, HttpResponseMessage response, out IPrincipal principal) { SecurityToken token = ExtractCredentials(request);  if (token != null) { ClaimsIdentityCollection claims = handlers.ValidateToken(token);  principal = new ClaimsPrincipal(claims);  return true; } else { response.StatusCode = HttpStatusCode.Unauthorized; response.Content = new StringContent("Access denied");  principal = null;  return false; } }  private SecurityToken ExtractCredentials(HttpRequestMessage request) { if (request.Headers.Authorization != null && request.Headers.Authorization.Scheme == "saml") { XmlTextReader xmlReader = new XmlTextReader(new StringReader(request.Headers.Authorization.Parameter));  var col = SecurityTokenHandlerCollection.CreateDefaultSecurityTokenHandlerCollection(); SecurityToken token = col.ReadToken(xmlReader);  return token; }  return null; }}This implementation receives a “SecurityTokenHandlerCollection” instance as part of the constructor. This class is part of WIF, and basically represents a collection of token managers to know how to handle specific xml authentication tokens (SAML is one of them). I also created a set of extension methods for injecting these interceptors as part of a service route when the service is initialized. var basicAuthentication = new BasicAuthenticationInterceptor((u) => true, "ContactManager");var samlAuthentication = new SamlAuthenticationInterceptor(serviceConfiguration.SecurityTokenHandlers); // use MEF for providing instancesvar catalog = new AssemblyCatalog(typeof(Global).Assembly);var container = new CompositionContainer(catalog);var configuration = new ContactManagerConfiguration(container); RouteTable.Routes.AddServiceRoute<ContactResource>("contact", configuration, basicAuthentication, samlAuthentication);RouteTable.Routes.AddServiceRoute<ContactsResource>("contacts", configuration, basicAuthentication, samlAuthentication); In the code above, I am injecting the basic authentication and saml authentication interceptors in the “contact” and “contacts” resource implementations that come as samples in the code preview. I will use another post to discuss more in detail how the brokered authentication with SAML model works with this new WCF Http bits. The code is available to download in this location.

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  • Link dos meus melhores artigos

    - by renatohaddad
    Olá pessoal, resolvi agregar os links dos meus melhores artigos.Engenharia Reversa no Entity Framework 5 http://msdn.microsoft.com/pt-br/library/jj856239.aspxDados Geográficos no Entity Framework 5 e SQL Server 2012 http://msdn.microsoft.com/pt-br/library/jj900151.aspxManutenção de Dados no Entity Framework 4 http://msdn.microsoft.com/pt-br/library/jj128160.aspxPOCO no Entity Framework 4 http://msdn.microsoft.com/pt-br/library/ff978717.aspxA importância e o uso do Data Annotation http://msdn.microsoft.com/pt-br/library/jj129537.aspxUso de parâmetros Opcionais no Visual C# 4 http://msdn.microsoft.com/pt-br/library/jj218324.aspxBing Maps no Windows Phone 7.5  http://msdn.microsoft.com/pt-br/library/hh972467.aspxWindows Phone 7 - dados de OData  http://msdn.microsoft.com/pt-br/library/hh972465.aspxReconhecimento de Voz no Windows Phone 8 http://msdn.microsoft.com/pt-br/library/jj856240.aspx Saibam que quase todos estes temas abordados nos artigos eu tenho em detalhes nos treinamentos via download em http://www.renatohaddad.com/loja.Bons estudos e sucesso nos projetos!Renatão

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  • Where should libraries be placed, in windows?

    - by Gabriel Diaconescu
    I have just moved from Linux to Windows, and I have to use the Zend Framework library. Where should the library be placed? Directly on C drive Create a lib folder like C:/lib/ Create a lib folder in my user folder I am wondering if there is a classic folder where these kind of libraries are placed. Update:I am asking about the location on my own standpoint. The Zend Framework library is a PHP framework.

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