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• POJO's versus Cursors in Android

  - by Kilnr

  I usually tend to define the model layer of my apps using POJO's, such as Article, Comment, etc. I was about to implement an AlphabetIndexer in the adapter of one of my ListViews. Right now this adapter accepts a Collection of Articles, which I normally get from my wrapper around an SQLiteDatabase. The signature of the AlphabetIndexer constructer is as follows: public AlphabetIndexer (Cursor cursor, int sortedColumnIndex, CharSequence alphabet) Since this doesn't accept a Collection or something similar, just a Cursor, it got me wondering: maybe I shouldn't be creating objects for my model, and just use the Cursors returned from the database? So the question is, I guess: what should I do, represent data with Collections of POJO's, or just work with Cursors throughout my app? Any input?

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• Entity Framework 4 relationship management in POCO Templates - More lazy than FixupCollection?

  - by Joe Wood

  I've been taking a look at EF4 POCO templates in beta 2. The FixupCollection looks fine for maintaining the model correctness after updating the relationship collection property (i.e. product.Orders it would set the order.Product reference ). But what about support for handling the scenario when some of those Order objects are removed from the context? The use-case of maintaining cascading deletes in the in-memory model. The old Typed DataSet model used to do this by performing the query through the container to derive the relationship results. Like the DataSet, this would require a reference to the ObjectContext inside the entity class so that it could query the top-level Order collection. Better support for Separation of Concerns in the ObjectContext would be required. It looks like EF is not suited to this use-case that DataSets did out of the box.... am I right?

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• How to override a method for a MovieClip Symbol in Flash CS3

  - by php html

  I'm using flash to draw objects, then I export them and use them from flex, and I'm a beginner in flash. I'm trying to do the override a method from the MovieClip I created. The method I'm trying to override is stop() method. I didn't write a single line of code, my movie clip is created using entirely the flash interface. I figured out how to add actions to the movie clip when a frame is reached but I'm stucked now when I'm trying to override a MovieClip method.

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• Debuging VBScript in Visual Studios Express

  - by Wil

  I have read around the net that its possible to debug VBScript WSH files Visual Studios 2005 Express (I think Web Edition) but everytime I try cscript.exe myscript.vbs //X the script just executes. I have tried VS Express 2005, 2008 and 2010 all editions. I have also tried Visual Studios Premium 2010 which does infact debug scripts as I would expect however I want to be able to debug scripts with free tools (I don't want to get a VS 2010 licence for all the other people on my team). I know about Microsoft Script Debugger but it doesn't let you discover objects as well as Visual studios does.

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• Cocoa Memory Usage

  - by user288024

  I'm trying to track down some peculiar memory behavior in my Cocoa desktop app. My app does a lot of image processing using NSImage and uploads those images to a website over HTTP using NSURLConnection. After uploading several hundred images (some very large), when I run Instrument I get no leaks. I've also run through MallocDebug and get no leaks. When I dig into object allocations using Instrument I get output like this: GeneralBlock-9437184, Net Bytes 9437184, # Net 1 GeneralBlock-192512, Net Bytes 2695168, # Net 14 and etc., for smaller sizes. When I look at these in detail, they're marked as being owned by 'Foundation' and created via NSConcreteMutableData initWithCapacity. During HTTP upload I'm creating a post body using NSMutableData, so I'm guessing these are buffers Cocoa is caching for me when I create the NSMutableData objects. Is there a way to force Cocoa to free these? I'm 90% positive I'm releasing correctly (and Instruments and MallocDebug seem to confirm this), but I think Cocoa is keeping these around for perf reasons since I'm allocating so many MSMutableData buffers.

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• Show choosen option in a notification Feed, Django

  - by apoo

  Hey I have a model where : LIST_OPTIONS = ( ('cheap','cheap'), ('expensive','expensive'), ('normal', 'normal'), ) then I have assigned the LIST_OPTIONS to nature variable. nature = models.CharField(max_length=15, choices=LIST_OPTIONS, null=False, blank=False). then I save it: if self.pk: new=False else: new=True super(Listing, self).save(force_insert, force_update) if new and notification: notification.send(User.objects.all().exclude(id=self.owner.id), "listing_new", {'listing':self, }, ) then in my management.py: def create_notice_types(app, created_models,verbosity, **kwargs): notification.create_notice_type("listing_new", _("New Listing"), _("someone has posted a new listing"), default=2) and now in my notice.html I want to show to users different sentences based on the options that they have choose so something like this: LINK href="{{ listing.owner.get_absolute_url }} {{listing.owner}} {% ifequal listing.nature "For Sale" %} created a {{ listing.nature }} listing, <a href="{{ listing.get_absolute_url }}">{{listing.title}}</a>. {% ifequals listing.equal "Give Away"%} is {{ listing.nature }} , LINK href="{{ listing.get_absolute_url }}" {{listing.title}}. {% ifequal listing.equal "Looking For"%} is {{ listing.nature }} , LINK href="{{ listing.get_absolute_url }}" {{listing.title}} {% endifequal %} {% endifequal %} {% endifequal %} Could you please help me out with this. Thank you

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• Testing an XQuery Transformation

  - by hakish

  Hi, I'm using Workshop for Weblogic and I'm testing an XQuery Transformation. Both MFL and XSD are valid. But the XQuery doesn't seem to work... it gives me this error: Error occurred while executing XQuery: loader constraint violation: when resolving method "javax.xml.stream.XMLInputFactory.createXMLStreamReader(Ljava/io/Reader;)Ljavax/xml/stream/XMLStreamReader;" the class loader (instance of org/eclipse/osgi/internal/baseadaptor/DefaultClassLoader) of the current class, weblogic/xml/query/parsers/StAXCursorAdaptor, and the class loader (instance of ) for resolved class, javax/xml/stream/XMLInputFactory, have different Class objects for the type javax/xml/stream/XMLStreamReader used in the signature Have you ever seen this before? How can I solve this please?

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• Dojo: drag and drop Stop Drag

  - by Jose L Martinez-Avial

  Hi, I'm trying to use Dojo dnd Source(1.4.2) to create an interface where I can move some objects from a Source to a Target. It is working fine, but I want to change the behaviour in order to execute a check before actually doing the D&D, so if the check fails, an error message is shown to the user, and the D&D is not made. I've tried the following example I found in a blog: dojo.subscribe("/dnd/drop", function(source,nodes,iscopy) { if (nodes[0].id == 'docs_menu'){ dojo.publish("/dnd/cancel"); dojo.dnd.manager().stopDrag(); alert("Drop is not permitted"); } } ); But it fails saying that this.avatar is null. Does anybody know how to do this? Thanks. Jose

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• Drop on NSTableView Behavior

  - by dave-gennel

  Hi, I have an NSTableView and I have successfully implemented both tableView:validateDrop:proposedRow:proposedDropOperation: and tableView:acceptDrop:row:dropOperation:. I don't need tableView:writeRowsWithIndexes:toPasteboard: because that's for dragging objects out of the NSTableView. Now, the problem is that I want it to behave kind of iTunes-like. In iTunes 9.x (I don't remember it for the previous versions) you have an NSTableView (the playlist) and when you drag a file over it you get this blue focus inside the NSTableView (maybe it's the NSScrollView?) and you don't have the blue horizontal line that indicates where you're going to insert an object. So basically I would like: No blue horizontal insert line between rows when hovering a file over the NSTableView. The blue focus inside the NSTableView (or NSScrollView). Any help would be greatly appreciated so thank you in advance.

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• Is this the correct way of speaking to a "Content Manager" Class?

  - by DeanMc

  I am creating a silverlight site. I am currently breaking out my ideas into pieces of functionality. One of the idea's I have is the concept of a content manager. This is essentially a UI control with 4 regions. Top, Bottom, Right & Left. I also have a collection of objects that are considered "Menu Items". These are controls that function as a way to navigate around, similar to links. The idea I have is to implement an IMenuItem interface. Among the standard pieces of information (Text, PageReference, etc) I was also going to hold a reference to the content manager. My idea behind this thinking is that I can pass the PageReference to a property on the ContentManager and then call a method which knows how to update the content manager accordingly. Is this the best way of implementing this or is their some sort of pattern for it?

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• Asking Box2d if a collision happened

  - by Rosarch

  I'm using Box2dx (ported to C#; optimized for XNA). It handles collision resolution, but how can I tell if two objects are currently colliding? This is the function I'm trying to write: public bool IsColliding(GameObjectController collider1, GameObjectController collider2) Where collider1.Model.Body is the Box2d Body, and collider1.Model.BodyDef is the Box2d BodyDef. (The same goes for collider2, of course.) UPDATE: Looks like contact listeners or this could be useful: AABB collisionBox; model.Body.GetFixtureList().GetAABB(out collisionBox); Why does GetFixtureList() return one fixture?

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• Compare two dates with JPA

  - by Kiva

  Hello everybody, I need to compare two dates in a JPQL query but it doesn't work. Here is my query: Query query = em.createQuery("SELECT h FROM PositionHistoric h, SeoDate d WHERE h.primaryKey.siteDb = :site AND h.primaryKey.engineDb = :engine AND h.primaryKey.keywordDb = :keyword AND h.date = d AND d.date <= :date ORDER BY h.date DESC"); My parameter date is a java.util.Date My query return a objects list but the dates are upper and lower to my parameter. Someone kown how to do this ? Thanks.

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• Rails migration to add boolean column to Postgres on Heroku

  - by pmc255

  I'm trying to execute a simple Rails migration to add a boolean column to an existing table. Here's the add_column call: add_column :users, :soliciting, :boolean, :null => false, :default => false However, after the migration runs (successfully, with no errors), I don't see the new column. If I go into the console and list the columns on the User table, for example, with this command: >> User.columns.each { |c| puts "#{c.name} : #{c.type}" } All the other columns show up, but not the one I just added with the migration. What's even more strange is that looking up a random user object yields the Postgres version of booleans (Ruby strings) >> User.find(1).soliciting => "t" However, the existing boolean columns all show up with standard Ruby boolean values of true and false. What's going on here? Is the migration actually complete? Why doesn't the column show up, yet is accessible in the model objects?

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• django ignoring admin.py

  - by noam

  I am trying to enable the admin for my app. I managed to get the admin running, but I can't seem to make my models appear on the admin page. I tried following the tutorial (here) which says: (Quote) Just one thing to do: We need to tell the admin that Poll objects have an admin interface. To do this, create a file called admin.py in your polls directory, and edit it to look like this: from polls.models import Poll from django.contrib import admin admin.site.register(Poll) (end quote) I added an admin.py file as instructed, and also added the following lines into urls.py: from django.contrib import admin admin.autodiscover() urlpatterns = patterns('', ... (r'^admin/', include(admin.site.urls)), ) but it appears to have no effect. I even added a print 1 at the first line of admin.py and I see that the printout never happens, So I guess django doesn't know about my admin.py. As said, I can enter the admin site, I just don't see anything other than "groups", "users" and "sites". What step am I missing?

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• glTexImage2D behavior on iPhone and other OpenGL ES platforms

  - by spurserh

  Hello, I am doing some work which involves drawing video frames in real time in OpenGL ES. Right now I am using glTexImage2D to transfer the data, in the absence of Pixel Buffer Objects and the like. I suspect that the use of glTexImage2D with one or two frames of look-ahead, that is, using several textures so that the glTexImage2D call can be initiated a frame or two ahead, will allow for sufficient parallelism to play in real time if the system is capable of it at all. Is my assumption true that the driver will handle the actual data transfer to the hardware asynchronously after glTexImage2D returns, assuming I don't try to use the texture or call glFinish/glFlush? Is there a better way to do this with OpenGL ES? Thank you very much, Sean

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• ComboBox wpf not item not being selected

  - by Greg R

  I am trying to bind a combo box to a list of objects, and it works great, besides the selected value, am I missing somethign? <ComboBox ItemsSource="{Binding OrderInfoVm.AllCountries}" SelectedValuePath="country_code" DisplayMemberPath="country_name" SelectedValue="{Binding OrderInfoVm.BillingCountry}" /> Basically I want to bind value to country codes and set the selected value to the country code bound to OrderInfoVm.BillingCountry (which implements INotifyPropertyChanged) Initially when the control loads selected value is empty, but on click BillingCountry is populated. Selected value does not seem to change. How can I remedy that?

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• Python serialize lexical closures?

  - by dsimcha

  Is there a way to serialize a lexical closure in Python using the standard library? pickle and marshal appear not to work with lexical closures. I don't really care about the details of binary vs. string serialization, etc., it just has to work. For example: def foo(bar, baz) : def closure(waldo) : return baz * waldo return closure I'd like to just be able to dump instances of closure to a file and read them back. Edit: One relatively obvious way that this could be solved is with some reflection hacks to convert lexical closures into class objects and vice-versa. One could then convert to classes, serialize, unserialize, convert back to closures. Heck, given that Python is duck typed, if you overloaded the function call operator of the class to make it look like a function, you wouldn't even really need to convert it back to a closure and the code using it wouldn't know the difference. If any Python reflection API gurus are out there, please speak up.

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• How can I use a custom ValidationAttribute to ensure two properties match?

  - by Brandon Linton

  We're using xVal and the standard DataAnnotationsValidationRunner described here to collect validation errors from our domain objects and view models in ASP.NET MVC. I'd like to have a way to have that validation runner identify when two properties don't match through the use of custom DataAnnotations. Right now I'm forced into doing it outside of the runner, this way: if (!(model.FieldOne == model.FieldTwo)) errors.Add(new ErrorInfo("FieldTwo", "FieldOne must match FieldTwo", model.FieldTwo)); My question is: can this be done using property-level validation attributes, or am I forced into using class-level attributes (in which case, I'd have to modify the runner...and my follow up question would be how best to retrieve them in that case). Thanks!

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• ICommand.CanExecute being passed null even though CommandParameter is set...

  - by chaiguy

  I have a tricky problem where I am binding a ContextMenu to a set of ICommand-derived objects, and setting the Command and CommandParameter properties on each MenuItem via a style: <ContextMenu ItemsSource="{Binding Source={x:Static OrangeNote:Note.MultiCommands}}"> <ContextMenu.Resources> <Style TargetType="MenuItem"> <Setter Property="Header" Value="{Binding Path=Title}" /> <Setter Property="Command" Value="{Binding}" /> <Setter Property="CommandParameter" Value="{Binding Source={x:Static OrangeNote:App.Screen}, Path=SelectedNotes}" /> ... However, while ICommand.Execute( object ) gets passed the set of selected notes as it should, ICommand.CanExecute( object ) (which is called when the menu is created) is getting passed null. I've checked and the selected notes collection is properly instantiated before the call is made (in fact it's assigned a value in its declaration, so it is never null). I can't figure out why CanEvaluate is getting passed null.

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• java.net.SocketTimeoutException: Read timed out

  - by Rafael Soto

  Hi Folks, I have an application with client server architecture. The client use Java Web Start with Java Swing / AWT and the sert uses HTTP server / Servlet with Tomcat. The communication is made from the serialization of objects, create a ObjectOutput serializes a byte array and send to the server respectively called the ObjectInputStream and deserializes. The application follows communicating correctly to a certain time of concurrency where starting to show error "SocketException read timeout". The erro happens when the server invoke the method ObjectInputStream.getObject() in my servlet doPost method. The tomcat will come slow and the errors start to decrease server response time until the crash time where i must restart the server and after everything works. Someone went through this problem ?

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• How to access MyProject.MySettings.Default.SomeSetting from xaml?

  - by Shimmy

  I have defined a StringCollection in the Project Settings. I want to use the values in a ComboBox. Is there a way to access it xamly? I tried: <CollectionViewSource Source="{x:Static src:MySettings.Default.MyCollection}" /> <CollectionViewSource x:Key="RoomSections" Source="{x:Static src:MySettings.Default.RoomSections}" /> *src is the xmlns of the project It says: "Type src:MySettings.Default was not found". The thing is that MySettings is a class that offers a Default property which is a thread-safe instance of MySettings, I really want to get the collection from the Default property and not by instantiating a new on. Is there other ways I am not aware of, maybe ObjectDataProvider can access static objects? I thought, maybe I can make in the App.xaml a global resource that return MySettings.Default which is an instance of the MySettings class, and then access all its properties, I will try that out, but I prefer the easy way.

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• Django Managers

  - by owca

  I have the following models code : from django.db import models from categories.models import Category class MusicManager(models.Manager): def get_query_set(self): return super(MusicManager, self).get_query_set().filter(category='Music') def count_music(self): return self.all().count() class SportManager(models.Manager): def get_query_set(self): return super(MusicManager, self).get_query_set().filter(category='Sport') class Event(models.Model): title = models.CharField(max_length=120) category = models.ForeignKey(Category) objects = models.Manager() music = MusicManager() sport = SportManager() Now by registering MusicManager() and SportManager() I am able to call Event.music.all() and Event.sport.all() queries. But how can I create Event.music.count() ? Should I call self.all() in count_music() function of MusicManager to query only on elements with 'Music' category or do I still need to filter through them in search for category first ?

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• QTreeWidget insertTopLevelItem - index given not accurately displayed in Tree?

  - by mleep

  I am unable to properly insert a QTreeWidgetItem at a specific index, in this case I am removing all QTreeWidgetItems from the tree, doing a custom sort on their Date Objects and then inserting them back into the QTreeWidget. However, upon inserting (even one at a time) the QTreeWidgetItem is not inserted into the correct place. The code below prints out: index 0: 0 index 0: 1 index 1: 0 index 0: 2 index 1: 1 index 2: 0 index 0: 3 index 1: 2 index 2: 0 index 3: 1 index 0: 4 index 1: 2 index 2: 0 index 3: 1 index 4: 3 print 'index 0: ', self.indexOfTopLevelItem(childrenList[0]) self.insertTopLevelItem(0, childrenList[1]) print 'index 0: ', self.indexOfTopLevelItem(childrenList[0]), ' index 1: ',\ self.indexOfTopLevelItem(childrenList[1]) self.insertTopLevelItem(0, childrenList[2]) print 'index 0: ', self.indexOfTopLevelItem(childrenList[0]), ' index 1: ',\ self.indexOfTopLevelItem(childrenList[1]), ' index 2: ', \ self.indexOfTopLevelItem(childrenList[2]) self.insertTopLevelItem(0, childrenList[3]) print 'index 0: ', self.indexOfTopLevelItem(childrenList[0]), ' index 1: ',\ self.indexOfTopLevelItem(childrenList[1]), ' index 2: ',\ self.indexOfTopLevelItem(childrenList[2]), 'index 3: ',\ self.indexOfTopLevelItem(childrenList[3]) self.insertTopLevelItem(0, childrenList[4]) print 'index 0: ', self.indexOfTopLevelItem(childrenList[0]),\ ' index 1: ', self.indexOfTopLevelItem(childrenList[1]),\ ' index 2: ', self.indexOfTopLevelItem(childrenList[2]),\ 'index 3: ', self.indexOfTopLevelItem(childrenList[3]),\ 'index 4: ', self.indexOfTopLevelItem(childrenList[4])

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• Can you define a ResourceDictionary.MergedDictionary together with other (local) resources in <Wind

  - by Jeremy Holt

  I would like to refer to a MergedDictionary together with locally declared resources in my Windows.Resources. However, I'm getting this error: "All objects added to an IDictionary must have a Key attribute or some other type of key associated with them." Is it possible to mix local resources together with imported resources in the same Window.Resources? The XAML is: <Window.Resources> <CollectionViewSource x:Key="cvsData" Source="{Binding Path=Data}"> <CollectionViewSource.GroupDescriptions> <PropertyGroupDescription PropertyName="Country"/> </CollectionViewSource.GroupDescriptions> </CollectionViewSource> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary x:Name="images" Source="pack://application:,,,/CoreWpfControls;component/Images.xaml"/> </ResourceDictionary.MergedDictionaries> </ResourceDictionary> </Window.Resources> Thanks Jeremy

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• Problem creating ObjectContext from different project inside solution.

  - by Levelbit

  I have two projects in my Solution. One implements my business logic and has defined entity model of entity framework. When I want to work with classes defined within this project from another project I have some problems in runtime. Actually, the most concerning thing is why I can not instantiate my, so called, TicketEntities(ObjectContext) object from other projects? when I catch following exception: The specified named connection is either not found in the configuration, not intended to be used with the EntityClient provider, or not valid. I found out it's brake at: public partial class TicketEntities : global::System.Data.Objects.ObjectContext { public TicketEntities() : base("name=TicketEntities", "TicketEntities") { this.OnContextCreated(); } with exception: Unable to load the specified metadata resource. Just to remind you everthing works fine from orginal project.

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