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• iPhone Development - Query related records using CoreData

  - by Mustafa

  I have a case where i have three entities with one-to-many and one-to-many relationships: Entity A (Entity B relationhip), Entity B (Entity A relationship, Entity C relationship), Entity C (Entity B relationhip) I have the reference of Entity A, and now i want to fetch all the related Entity C records. How can i do that? (with least amount of code) Edit: Here's another way to put it. Can we perform joins with CoreData. For example, (and this is a very crude example), We have a following entity-relationship: Grand Parent (1)---(m) Parent Parent (1)---(m) Child So, now if i have "Albert" the Grand Parent, and i want to get all his grand children, how can i do that?

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• Dynamically creating a TreeViewin HTML with indent lines in ASP.NET

  - by Ben

  Hi, i'm quite new to HTML, and am trying to create a professional looking TreeView. I can not use the in built TreeView in ASP.NET as i need to point the target of the selection to another frame (I have tried, and this doesn't seem possible). My TreeView is built up as follows: Folder1 ChildOne ChildTwo ChildThree Folder2 ChildOne ChildTwo ChildThree I have the collapsing of the folders working, but would like to know how to format this TreeView so it has dotted lines down to the child nodes (as most TreeViews tend to have). How would i go about this? Cheers.

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• onsubmit() does not work.

  - by the Hampster

  Here is something that I find disturbing. I created a small form, and I'm using AJAX to validate for me. I have a javascript function authenticate() that works sometimes. <form method="post" action="" id="login_form" onsubmit="authenticate()";> // various inputs <input type="button" onclick="authenticate()" value="Log In"> </form> authenticate() works just fine when I click the button. However, if I press enter the form is submitted, and it fails. It also fails if I call onSubmit(). In my debugging, I alert the outgoing texts-- they are identical. However, the Prototype Ajax function calls it the onSuccess, but there is just no response from the server. (The server outputs either "Success" or "Failure"). Why the different behaviors for onClick() vs onSubmit()? The exact same function is called, but the results are different. Any help would be appreciated. --Dave

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• Subclassing UIScrollView for drawing w/o views

  - by David Dunham

  I'm contemplating subclassing UIScrollView (the way UITextView does) to draw a fairly large amount of text (formatted in ways that NSTextView can't). So far the view won't actually scroll. I'm setting contentSize, and when I drag, I see the scroll indicator. But nothing changes (and I don't get a drawRect: message). An alternate approach is to use a child view, and I've done this. The view can be over 5000 pixels high, however, and I'm a bit concerned about performance on an actual device. (The other approach, be like UITableView, would be a huge pain -- I'm "porting" Mac Cocoa code, and a collection of views would be a huge architecture change.) I've done some searching, but haven't found anyone who is using UIScrollView to do the drawing. Has anyone done this and know of any pitfalls?

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• AS3: How to access pixel data efficiently?

  - by JonoRR

  I'm working a game. The game requires entities to analyse an image and head towards pixels with specific properties (high red channel, etc.) I've looked into Pixel Bender, but this only seems useful for writing new colors to the image. At the moment, even at a low resolution (200x200) just one entity scanning the image slows to 1-2 Frames/second. I'm embedding the image and instance it as a Bitmap as a child of the stage. The 1-2 FPS situation is using BitmapData.getPixel() (on each pixel) with a distance calculation beforehand. I'm wondering if there's any way I can do this more efficiently... My first thought was some sort of spatial partioning coupled with splitting the image up into many smaller pieces. I also feel like Pixel Bender should be able to help somehow, however I've had little experience with it. Cheers for any help. Jonathan

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• Recursive TreeView in C# ASP.NET

  - by waqasahmed

  I have an object of type list from which I wish to use to populate a treeview in asp.net c#. Each object item has: id | Name | ParentId so for example: id | Name | ParentId 1 | Alice | 0 2 | Bob | 1 3 | Charlie | 1 4 | David | 2 In the above example, the parent would be Alice having two children Bob and Charlie. David is the child of Bob. I have had many problems trying to dynamically populate the treeview recursively in c# ASP.NET Does any one have a simple solution? Btw: you can use People.Id, People.Name and People.ParentId to access the members since it is an object belonging to list. I can post you my code so far (many attempts made) but not sure how useful it will be.

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• How to add children of an ItemsControl where the children should decide their own position in Wpf?

  - by code-zoop

  Hey all I am using a wpf slider to display the time line in a video player. I need to add an ItemControl of some sort on top of this so that I can add buttons on the time line on certain positions in the time line (the buttons will hold their own position relative to the parent ItemsControl). What ItemsControl container should I use where I can add child elements that know their own position (based on their timecode)? I have looked at the different ItemsControls in Wpf, and it looks like all of them have a certain way to stack their children (Horizontal or vertical one after another)! And to add some more complexity, How can the positioning of the children be relative to the width of the parent ItemsControl? This way scaling up and down the ItemsContol will reposition the children! Thanks

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• ASP.NET Nested masterpages, how to set content in the top page from the aspx file?

  - by David Suarez

  I have some content from a CMS that I need to move to raw asp.net pages. Since the templates are nested I guess I can use nested masterpages to acomplish it, but I'm finding that I can't set values on the top masterpage from the deep child page. Here is a sample. I have several nested masterpages with contentplaceholders: top master (with contentPlaceHolder1) nested master, dependent on top master (with contentPlaceHolder2) aspx page, dependent on nested master, defines content for contentPlaceHolder1 and 2 The problem is that asp.net doesn't allow me to have the value of contentPlaceHolder1 defined in the content page, it should be defined in the nested master. But the point is that the client page knows that value, not the template masters (for instance, the page knows about the graphic it has to display on the the top, but the placeholder for the graphic is the top master). How can I set values in the aspx page to be rendered in the top master?

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• jquery: why a selector returns me an array, but attribute doesnt?

  - by Shlomi.A.

  Hi. I'm trying to understand JQ better. I'm calling an JQ object $(".FamiliesList li li span[class!='']").prev().find('option:selected') this returns back to me an array of all the options that their span parent's brother has a classname. [option, option] Now- I want to return back an array of the option's values $(".FamiliesList li li span[class!='']").prev().find('option:selected').attr('value') this returns back to me only the first child value, and a full array of the values. Why? I would appreciate to receive help and understand jq better :) Thanks.

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• How do I customize the WPF StatusBar layout?

  - by Kent Boogaart

  Adding more than one child to a WPF StatusBar results in poor layout with little option to customize. For example, this code: <StatusBar> <StatusBarItem> <TextBlock>Ready</TextBlock> </StatusBarItem> <StatusBarItem> <TextBlock>Set</TextBlock> </StatusBarItem> </StatusBar> Results in: This is not the ideal layout, since the "Set" is squeezed right up against the "Ready". How do I gain full control over the layout of the WPF StatusBar control?

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• Converting a flat array to a nested array

  - by matte

  Hi, I am trying to convert a flat array to a nested array depending on the 'level' data of each array item. 'level' data shows us if current array item is a child, a parent or a sibling. Here is the flat array: $sequentialArray = array( array('title'=>'Page 1', 'level'=>0), array('title'=>'Page 2', 'level'=>0), array('title'=>'Page 3', 'level'=>1), array('title'=>'Page 4', 'level'=>1), array('title'=>'Page 5', 'level'=>2), array('title'=>'Page 6', 'level'=>0), array('title'=>'Page 7', 'level'=>1), array('title'=>'Page 8', 'level'=>0) ); And here is the expected result: $nestedArray = array( array('title'=>'Page 1', 'children'=>array()), array('title'=>'Page 2', 'children'=>array( array('title'=>'Page 3', 'children'=>array()), array('title'=>'Page 4', 'children'=>array( array('title'=>'Page 5', 'children'=>array()) )), )), array('title'=>'Page 6', 'children'=>array( array('title'=>'Page 7', 'children'=>array()) )), array('title'=>'Page 8', 'children'=>array()), ); I tried using references with array indexes but that didn't work. Any ideas?

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• wpf manually generate TreeViewItem container

  - by viky

  I am creating a TreeView at runtime. It has several nodes(TreeViewItem), each one having a name. Initially it is collapsed. A separate comboBox displays Names of all TreeViewItem. I have to highlight a TreeViewItem based on the Name selected. I am using a recursive function and gets the TreeViewItem container like this: if (parent.ItemContainerGenerator.Status != GeneratorStatus.ContainersGenerated) continue; TreeViewItem container = parent.ItemContainerGenerator.ContainerFromItem(child).As<TreeViewItem>(); but it is parent.ItemContainerGenerator.Status = GeneratorStatus.NotStarted for all the collapsed items. How can I generate containers for them manually(Without expanding them)?

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• When and how should custom hierarchies be used in clojure?

  - by Rob Lachlan

  Clojure's system for creating an ad hoc hierarchy of keywords is familiar to most people who have spent a bit of time with the language. For example, most demos and presentations of the language include examples such as (derive ::child ::parent) and they go on to show how this can be used for multi-method dispatch. In all of the slides and presentations that I've seen, they use the global hierarchy. But it is possible to keyword relationships in custom hierarchies. Some questions, therefore: Are there any guidelines on when this is useful or necessary? Are there any functions for manipulating hierarchies? Merging is particularly useful, so I do this: (defn merge-h [& hierarchies] (apply merge-with (cons #(merge-with clojure.set/union %1 %2) hierarchies)) But I was wondering if such functions already exist somewhere.

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• PropertyChanged doesn't work properly

  - by Karen

  Hello, I have a Silverlight application in which I implemented MVVM pattern. In my application there is a child window on which I have ComboBox. I bound ItemsSource and SelectedItem of my combobox to a property (typeof ObservableCollection) and property of MyType appropriately. MyType is a "MODEL" derived from INotifyPropertyChanged. When my window is loaded I set values to this properties. But my combobox doesn't display selected item. I found that when I set property which is bound to selected item (in ViewModel), the PropertyChanged event is null. Can anyone help me. Thanks.

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• Is WPF Decorator class useful?

  - by darja

  I need to create control to draw border around its child. So, I have created class and derived it from Decorator: class RoundedBoxDecorator : Decorator { protected override Size ArrangeOverride(Size arrangeSize) { //some source } protected override void OnRender(DrawingContext dc) { //some source } } It works fine, but I have some doubts about using Decorator as ancestor. I have found in MSDN that there are no special methods or properties in it, only derived from its ancestors (UIElement or FrameworkElement). ArrangeOverride and OnRender are also derived. So, what for Decorator class was designed and does it makes sense to use it? Or I can derive from FrameworkElement?

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• What does the "ApplicaionDirectory" Membership condition mean in .NET Code Access Security?

  - by smwikipedia

  I am not sure about the semantic of "ApplicationDirectory" membership condition. I am trying to use it in the .NET Framework 2.0 configuration tool. The tool's explanation to it is as below: The Application Directory membership condition is true for all assemblies in the same directory or in a child directory of the running application. Assemblies that meet this membership condition will be granted the permissions associated with this code group. All the other membership conditions such as strong name, hash, need me to input some criterias, only the Application Directory has not. How to use it? Could someone give an explanation by example? Many thanks.

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• Unable to load detached NIB in View

  - by Sheehan Alam

  I have two NIB's ParentViewController.xib ChildViewController.xib ParentViewController.xib contains a UIView and a UIViewController. ChildViewController.xib contains a UIButton I want ChildViewController.xib to load in the ParentViewController.xib's UIView I have done the following: Created @property for UIView in ParentViewController Connected File's Owner to UIView in ParentViewController Set UIViewController in ParentViewController's NIB Name property to ChildViewController in Interface Builder Set ChildViewController view property to UIView in ParentViewController I was hoping this would load ChildViewController into my UIView in ParentViewController but no luck. I did get the following warning, which could be the culprit: 'View Controller (Child View)' has both its 'NIB Name' property set and its 'view' outlet connected. This configuration is not supported. I also have added additional code in ParentViewController's viewDidLoad(): - (void)viewDidLoad { [super viewDidLoad]; ChildViewController *childViewController = [[ChildViewController alloc]initWithNibName:@"ChildViewController" bundle:nil]; childViewController.view = self.myView; } Any thoughts on why ChildViewController does not load in the UIView of ParentViewController?

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• .Net 3.5 Chart Controls Exception

  - by ChrisHDog

  I am using the new free .net chart controls and they appear to work fine when I run the project up in visual studio, but when hitting the same via IIS I get and exception: [HttpException (0x80004005): No http handler was found for request type 'GET'] System.Web.HttpApplication.MapIntegratedHttpHandler(HttpContext context, String requestType, VirtualPath path, String pathTranslated, Boolean useAppConfig, Boolean convertNativeStaticFileModule) +529 System.Web.HttpServerUtility.Execute(String path, TextWriter writer, Boolean preserveForm) +947 [HttpException (0x80004005): Error executing child request for ChartImg.axd.] System.Web.HttpServerUtility.Execute(String path, TextWriter writer, Boolean preserveForm) +4120098 System.Web.UI.DataVisualization.Charting.ChartHttpHandler.EnsureInitialized(Boolean hardCheck) +266 System.Web.UI.DataVisualization.Charting.Chart.GetImageStorageMode() +25 System.Web.UI.DataVisualization.Charting.Chart.Render(HtmlTextWriter writer) +133 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +240 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +240 System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer) +253 System.Web.UI.HtmlControls.HtmlForm.Render(HtmlTextWriter output) +87 System.Web.UI.HtmlControls.HtmlForm.RenderControl(HtmlTextWriter writer) +53 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +240 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +240 System.Web.UI.Page.Render(HtmlTextWriter writer) +38 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4240 Any idea what I'm doing wrong? Thanks!

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• Fixtures and inheritance in Symfony

  - by Tere

  Hi! I have a database schema in Symfony like this: Persona: actAs: { Timestampable: ~ } columns: primer_nombre: { type: string(255), notnull: true } segundo_nombre: { type: string(255) } apellido: { type: string(255), notnull: true } rut: { type: string(255) } email: { type: string(255) } email2: { type: string(255) } direccion: { type: string(400) } ciudad: { type: string(255) } region: { type: string(255) } pais: { type: string(255) } telefono: { type: string(255) } telefono2: { type: string(255) } fecha_nacimiento: { type: date } Alumno: inheritance: type: concrete extends: Persona columns: comentario: { type: string(255) } estado_pago: { type: string(255) } Alumno_Beca: columns: persona_id: { type: integer, primary: true } beca_id: { type: integer, primary: true } relations: Alumno: { onDelete: CASCADE, local: persona_id, foreign: id } Beca: { onDelete: CASCADE, local: beca_id, foreign: id } Beca: columns: nombre: { type: string(255) } monto: { type: double } porcentaje: { type: double } descripcion: { type: string(5000) } As you see, "alumno" has a concrete inheritance from "persona". Now I'm trying to create fixtures for this two tables, and I can't make Doctrine to load them. It gives me this error: SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails (eat/alumno__beca, CONSTRAINT alumno__beca_persona_id_alumno_id FOREIGN KEY (persona_id) REFERENCES alumno (id) ON DELETE CASCADE) Does someone know how to write a fixture for a table inherited from another? Thanks!

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• Object Slicing, Is it advantage ?

  - by harigm

  Object slicing is some thing that object looses some of its attributes or functions when a child class is assigned to base class. Some thing like Class A{ } Class B extends A{ } Class SomeClass{ A a = new A(); B b = new B(); // Some where if might happen like this */ a = b; (Object slicing happens) } Do we say Object slicing is any beneficial in any ways? If yes, can any one please tell me how object slicing be a helpful in development and where it might be helpful?

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• ASP.NET - How to add a label to a RadioButtonList ListItem?

  - by EWizard

  I have a RadioButtonList with two ListItems included: <asp:RadioButtonList runat="server" ID="optRollover" OnSelectedIndexChanged="RolloverOptionSelected" AutoPostBack="true"> <asp:ListItem Value="0">100% </asp:ListItem> <asp:ListItem Value="1">Less than 100%</asp:ListItem> </asp:RadioButtonList><br /> On the first ListItem I need to have a label that displays some text from the code behind of the page. Logically it seems to me like I would be able to do something like this: 100% Obviously this does not work because I am getting an error: The 'Text' property of 'asp:ListItem' does not allow child objects. Can anyone think of a way around this constraint?

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• Two separate fields need to be grouped in one group

  - by Sigita

  I have two fields: Mother's employer and Father's employer, and I need to group on the employer. Could somebody help me combine the two above fields into one group? Both fields are in one table. FOr example a child named John Lewis is a record in a table and he has a father and a mother and Mother's employer is IBM and Father's employer is ISF. And so forth. I need to come up with a list By employer where it would show: Employer: IBM John Lewis Emplyer: ISF John Lewis Employer: .... Thank you, Sigita

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• Get children count via HQL

  - by Thomas Lötzer

  Hi, I have a one-to-many mapping between a parent entity and child entities. Now I need to find the number of children associated with each parent for a list of parents. I am trying to do this with HQL but I am not sure how I can get the list of parents in there. Also, I don't know how I can return the entity itself and not just its ID. My current HQL query is: select new map(parent.id as parentId, count(*) as childCount) from Parent parent left join parent.children children group by parent.id but this only returns the ID and does not filter on specific parents. EDIT Based on Pascal's answer I have modified the query to select new map(parent as parent, count(elements(parent.children)) as childCount) from Parent parent group by parent That does work, but is prohibitively slow: 30 seconds instead of 400 ms on the same database.

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• How to copy or duplicate gtk widgets?

  - by PP

  Hi, How to copy or duplicate gtk widgets? In my application I have one huge GtkComboBox created with one long for loop which eats up so much of time and I am using this combo at two places in one single screen. So, what I want to do is create this combo for one time and duplicate/copy it in another one so it will save my time. If I try to add same combo box pointer two times, gtk gives me error "child-paren != NULL" cause in gtk widget can have only single parent. So what to do? Thanks, PP.

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• How to create trunk directory in existing svn repo without a trunk, and move all files to new trunk?

  - by stupakov

  Hi all, I've got an svn repo with no trunk dir. I'd like to create the trunk and branches dirs, and move all my files (currently in the root) into trunk. Creating trunk works just fine: macbook[601] # svn mkdir trunk A trunk macbook[602] # svn commit trunk Adding trunk Committed revision 67. moving everything into trunk fails: macbook[604] # svn move * trunk svn: Cannot copy path 'trunk' into its own child 'trunk/trunk' is there a way to do this without giving it all the file and dir names individually? There are threads describing how to do this with TortoiseSVN, but i'd like to know the right way to do it with the svn commandline. Thanks.

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