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• [Django] Automatically Update Field when a Different Field is Changed

  - by Gordon

  I have a model with a bunch of different fields like first_name, last_name, etc. I also have fields first_name_ud, last_name_ud, etc. that correspond to the last updated date for the related fields (i.e. when first_name is modified, then first_name_ud is set to the current date). Is there a way to make this happen automatically or do I need to check what fields have changed each time I save an object and then update the related "_ud" fields. Thanks a lot!

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• Django South Foreign Keys referring to pks with Custom Fields

  - by Rory Hart

  I'm working with a legacy database which uses the MySQL big int so I setup a simple custom model field to handle this: class BigAutoField(models.AutoField): def get_internal_type(self): return "BigAutoField" def db_type(self): return 'bigint AUTO_INCREMENT' # Note this won't work with Oracle. This works fine with django south for the id/pk fields (mysql desc "| id | bigint(20) | NO | PRI | NULL | auto_increment |") but the ForeignKey fields in other models the referring fields are created as int(11) rather than bigint(20). I assume I have to add an introspection rule to the BigAutoField but there doesn't seem to be a mention of this sort of rule in the documentation (http://south.aeracode.org/docs/customfields.html). Update: Currently using Django 1.1.1 and South 0.6.2

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• MVVM in a canvas with usercontrols

  - by Mauro Destro

  I have a MVVM WPF application that basically wants to be a single line diagram designer for an electrical distribution network. I have a canvas that must contains transformers, circuit breaker, lines and cables. My big problem is the design... How can i start? I think about a DesignerView, DesignerViewModel that contains an ObservableCollection of IDesignerItemViewModel that is my base class for all the element. But in this case I have to use ItemsControl to bind the content of the canvas to my collection but the pros is that I don't have to create usercontrol for each element but i'll solve most of the problems with DataTemplate (i suppose). Each element viewmodel mantain a link to a model persisted in a repository where i mantain my logical tree. Any hint about how to proceed, I have looked at many DiagramCanvas example but all of those use simple items most like simple rectangle...

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• How to style alternating rows in asp.net mvc

  - by YeahStu

  I am using a <% foreach ...% loop to list a collection of items on my website. I want to add a different background color for the style of alternating rows in my list. I have found a way to do this but I am not satisfied with it as it seems like a hack. Here is what I have done to solve it so far: <table> <% int counter = 0; foreach (var item in Model) { counter++; if (counter % 2 == 0) { %> <tr class="colorfull"> <% } else { %> <tr> <% } %> ... Is there a best practice that I am missing that people are using for this scenario in ASP.NET MVC?

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• Automapper: Ignore on condition of

  - by Kieranmaine

  Is it possible to ignore mapping a member depending on the value of a source property? For example if we have: public class Car { public int Id { get; set; } public string Code { get; set; } } public class CarViewModel { public int Id { get; set; } public string Code { get; set; } } I'm looking for something like Mapper.CreateMap<CarViewModel, Car>() .ForMember(dest => dest.Code, opt => opt.Ignore().If(source => source.Id == 0)) So far the only solution I have is too use two different view model and create different mappings for each one.

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• Why does a newly created EF-entity throw an ID is null exception when trying to save?

  - by Richard

  I´m trying out entity framework included in VS2010 but ´ve hit a problem with my database/model generated from the graphical interface. When I do: user = dataset.UserSet.CreateObject(); user.Id = Guid.NewGuid(); dataset.UserSet.AddObject(user); dataset.SaveChanges(); {"Cannot insert the value NULL into column 'Id', table 'BarSoc2.dbo.UserSet'; column does not allow nulls. INSERT fails.\r\nThe statement has been terminated."} The table i´m inserting into looks like so: -- Creating table 'UserSet' CREATE TABLE [dbo].[UserSet] ( [Id] uniqueidentifier NOT NULL, [Name] nvarchar(max) NOT NULL, [Username] nvarchar(max) NOT NULL, [Password] nvarchar(max) NOT NULL ); GO -- Creating primary key on [Id] in table 'UserSet' ALTER TABLE [dbo].[UserSet] ADD CONSTRAINT [PK_UserSet] PRIMARY KEY CLUSTERED ([Id] ASC); GO Am I creating the object in the wrong way or doing something else basic wrong?

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• Using Sqlite3 with CakePHP

  - by Dan

  Hello, I'm trying to run Sqlite3 with CakePHP. Yes, i know it's not officially supported, but this post here: http://stackoverflow.com/questions/1021980/cakephp-sqlite says it's possible. I've downloaded the new driver file "dbo_sqlite3.7.php" and put it in "cake/libs/model/datasources/dbo". Now I'm having trouble getting connected to the db. Things I'm confused on: Where should my database.sqlite file be kept What should my config file look like. Should I be referencing the full filename of the driver? Like 'driver' = 'dbo_sqlite3.7.php'? And can I use relative paths to the db file? Is there a difference in sqlite3 files and sqlite2 files by themselves, or is it just the way that you handle the files that makes the difference? Thank you for your help. I'm new to cake and I'm excited about learning more.

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• Memory leak returning QIcon

  - by Stefano

  I started using Qt but I'm facing a big problem: I implemented my custom model that inhrerits from the QAbstractListModel class. What I want to do is to display a list with icon. All works and the image is shown with my code but it creates a memory leak. If I don't return the icon no memory leak is detected. class MyModel : public QAbstractListModel { public: ... private: QIcon myicon; } QVariant MyModel::data(const QModelIndex &index, int role) const { ... if (role == Qt::DecorationRole) { return this->myicon; } ... }

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• Use super with before_validation.

  - by krunal shah

  I have this code in my every model. Class people def before_validation @attributes.each do |key,value| self[key] = nil if value.blank? end end end Now i want to put my loop in separate module. Like Module test def before_validation @attributes.each do |key,value| self[key] = nil if value.blank? end end end And i want to call this before_validation this way Class people include test def before_validation super .....Here is my other logic part..... end end Are there any way to do it like that in rails??

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• Append XML string block WITH NAMESPACE REF to existing XmlDocument in .NET

  - by FT

  I have an xml document (XmlDocument) which looks like this... <stuff xmlns:n="hhtp://tempuri.com/"> </stuff> ... and a "fragment" (string) which looks like this <things> <thing n:type="info"> </thing> </things> I want to "inject" the fragment into the main document. How? (HINT: You can't use XmlDocumentFragment because the namespace 'n' isn't declared in the fragment, and the object model complains about this - throwing an 'unknown namespace' error even though the resultant document will be perfectly valid.)

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• Email Verification plugin for rails?

  - by Larry K

  Hi, I'd like to verify a user's email address by sending them a verify-email-message. Do you know of a good Rails plugin that they've used or seen? Since I didn't see anything good via Google, at this point, my thought is: Add a verified boolean field to the user model. Default false. After user is added (unverified), combine email with a salt (a secret), and create the sha1 hash of the email/salt combo. The result is the verification. Send a welcoming / verification email to the user. Email includes a url that has the email address and verification as GET args to a verify action on my server. The verify action recomputes the verification using the supplied email and checks that the new verification matches the one in the url. If it does, then the User rec for the email is marked 'verified' Also will provide action to re-send the verification email. Any comments on the above? Thanks, Larry

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• Entity Framework, full-text search and temporary tables

  - by markus

  I have a LINQ-2-Entity query builder, nesting different kinds of Where clauses depending on a fairly complex search form. Works great so far. Now I need to use a SQL Server fulltext search index in some of my queries. Is there any chance to add the search term directly to the LINQ query, and have the score available as a selectable property? If not, I could write a stored procedure to load a list of all row IDs matching the full-text search criteria, and then use a LINQ-2-Entity query to load the detail data and evaluate other optional filter criteria in a loop per row. That would be of course a very bad idea performance-wise. Another option would be to use a stored procedure to insert all row IDs matching the full-text search into a temporary table, and then let the LINQ query join the temporary table. Question is: how to join a temporary table in a LINQ query, as it cannot be part of the entity model?

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• Localize DisplayNameAttributes in ActionFilter?

  - by boris callens

  Is it possible to access the DisplayNameAttributes that are used on my ViewData.Model so I can Localize them before sending them to the view? Something like this: Public Void OnActionExecuted(ActionExecutedContext: filterContext) { foreach (DisplayNameAttribute attr in filterContext...) { attr.TheValue = AppMessages.GetLocazation(attr.TheValue); } } What I'm missing is how to access the attributes. Is this possible at all? P.S: We're using vb.net at my job and it's infiltrating my brain. So apologies if my C# is a tad off.

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• code first CTP5 error message

  - by user482833

  I get the following error message with a new project I have set using code first CTP5. Can't find anything on the web about it. Has anyone encountered this error message? The context cannot be used while the model is being created. This occurs the first time my database context is called (code below): using (StaffData context = new StaffData()) { return context.Employees.Count(e = e.EmployeeReference) == 1; } At this point the database has not been created. I have a database initialiser DropCreateDatabaseIfModelChanges which I set in app_start.

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• Django and App Engine

  - by notnoop

  I wanted to check the status of running Django on the Google App Engine currently and what the benefits of running django on GAE over simply using Webapp. Django main killer feature, IMHO, is the reuseable apps and middleware. Unfortunately, most current Django apps use models or model forms (django-tags, django-reviews, django-profiles, Pinax apps). So what are the remaining features or benefits that django has that can still run in Google App Engine (other than what's disabled: the popular django apps, session and authentication middleware, users and admin, models, etc). Also, is there a list of the Django apps that work in App Engine as well?

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• Basic Ruby on Rails Question about routing

  - by Acidburn2k

  I have a controller without any related model. This controller is to span some informations from various models. I have lots of actions there, which define certain views on the page. What would be the best way to organize routes for this controller. What I would like is to have /dashboard/something point to any action in the dashboard controller. Not actions like new/edit but arbitrary (showstats, etc). With trail and error I made something like this: map.dashboard 'dashboard/:action', :controller => 'dashboard', :action => :action Now it is possible to access those url using helper: dashboard_url('actionname') This approch seems to be working ok, but is this the way to go? I am not quite sure understand, how are the helper method names generated. How to generate same helper names as in basic controllers "action_controller_url" ? That would be more generic and made the code more consistent. Thanks in advance.

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• Routing Users to single Models with Rails

  - by Eric Koslow

  I'm creating a Rails app for students and high schools and I'm having some trouble with my User.rb. I want to have a user model to be used for logging in, but having that user have many roles. The tricky part is that I want users that have a student role to have_one student page, and those that have a role of principal to have_one high_school page. The students and also nested in the high_school so the entire thing becomes a big mess. So my question(s): How do I limit a user to only creating one student / high school to represent them? Also how would I nest this student pages inside the highschool without screwing up the user system? My environment: Rails3 and Ruby 1.9.2dev Thank you!

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• selected Rows/Line in QTableView copy to QClipboard

  - by Berschi

  Hi. First of all, sorry for bad English. It's about C++ and Qt. I have a SQLite-Database and I did it into a QSqlTableModel. To show the Database, I put that Model into a QTableView. Now I want to create a Method where the selected Rows (or the whole Line) will be copied into the QClipboard. After that I want to insert it into my OpenOffice.Calc-Document. But I have no Idea what to do with the "Selected"-SIGNAL and the QModelIndex and how to put this into the Clipboard. So can you please help me? Berschi

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• Only show content when certain criteria is met?

  - by Elliot

  I'm wondering if theres a best practice for what I'm trying to accomplish... First we have the model categories, categories, has_many posts. Now lets say, users add posts. Now, I have a page, that I want to display only the current user's posts by category. Lets say we have the following categories: A, B, and C User 1, has posted in Categories A and B. In my view I have something like: @categories.each do |category| category.name @posts.each do |post| if post.category_id==category.id post content here end end end The problem with this, is I'm going to show the empty category, as well as the categories that do have content. Is there a more efficient way of going about this? As I don't want to show the empty categories. Best, Elliot

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• MVC pattern and (Game) State pattern

  - by topright

  Game States separate I/O processing, game logic and rendering into different classes: while (game_loop) { game->state->io_events(this); game->state->logic(this); game->state->rendering(); } You can easily change a game state in this approach. MVC separation works in more complex way: while (game_loop) { game->cotroller->io_events(this); game->model->logic(this); game->view->rendering(); } So changing Game States becomes error prone task (switch 3 classes, not 1). What are practical ways of combining these 2 concepts?

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• [Cocoa] CoreData bindings for NSPopupButton

  - by ndg

  I'm looking to use a dropdown menu (possibly an NSPopupButton object) to represent the hierarchical results of two Core Data entities (Genre and Movie) and their relationships. In my current data model, my Genre entity has a one-to-many relationship with my Movie entity. What I'm now looking to do is generate the contents of an NSPopupButton to show a hierarchical list of Genres and the Movies associated with them, like so: Genre 1 Film 1 Film 2 Genre 2 Film 3 Film 4 Note that, in the above example, only Movie objects are to be selectable by the user (Genre objects will appear, but be unselectable). Also, to complicate matters slightly, I have an additional NSPopupButton which lists Movie Rental locations. The location selected by the user ultimately impacts on the genres and films available in the second dropdown. I imagine that bindings will only take me so far with this problem and that, ultimately, I'll have to populate the contents of the dropdown menu myself. I'm posting here for thoughts and opinions on the best way to go about this.

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• ASP.Net security using Operations Based Security

  - by Josh

  All the security stuff I have worked with in the past in ASP.Net for the most part has been role based. This is easy enough to implement and ASP.Net is geared for this type of security model. However, I am looking for something a little more fine grained than simple role based security. Essentially I want to be able to write code like this: if(SecurityService.CanPerformOperation("SomeUpdateOperation")){ // perform some update logic here } I would also need row level security access like this: if(SecurityService.CanPerformOperation("SomeViewOperation", SomeEntityIdentifier)){ // Allow user to see specific data } Again, fine grained access control. Is there anything like this already built? Some framework that I can drop into ASP.Net and start using, or am I going to have to build this myself?

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• Custom broadcast events in AS3?

  - by Ender

  In Actionscript 3, most events use the capture/target/bubble model, which is pretty popular nowadays: When an event occurs, it moves through the three phases of the event flow: the capture phase, which flows from the top of the display list hierarchy to the node just before the target node; the target phase, which comprises the target node; and the bubbling phase, which flows from the node subsequent to the target node back up the display list hierarchy. However, some events, such as the Sprite class's enterFrame event, do not capture OR bubble - you must subscribe directly to the target to detect the event. The documentation refers to these as "broadcast events." I assume this is for performance reasons, since these events will be triggered constantly for each sprite on stage and you don't want to have to deal with all that superfluous event propagation. I want to dispatch my own broadcast events. I know you can prevent an event from bubbling (Event.bubbles = false), but can you get rid of capture as well?

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• C# settings using ApplicationSettingsBase - roaming and common

  - by Mark Pim

  I'm using the Windows Forms Application settings architecture (or however you're supposed to refer to it) and am successfully saving user settings to AppData. What I want to do is have some settings common to all users of a particular machine and some settings which roam with users across machines. For example I have some settings relating to a peripheral attached to the computer (model, settings etc.) and some user preferences like user interface colours. The colours preferences should roam with the user, but the peripheral settings should stay on the local computer no matter who's logged on. How can I mark these types of settings so that some get stored in /AppData/... and some in /AppData? Note that I don't want Application level settings - each computer the app will be installed on will have different settings. I'm targetting .Net 3.0 if that makes a difference.

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• MVC Design Question

  - by 104286623826380127552

  On a MVC 2 website what I want to do is get a list of products / CategoryId. From that list, create a list of distinct CategoryId's. Then randomly pick a categoryId from the second list and use it to get all the products for that categoryId. I then want to store that CategoryId so that I don't display those products on the next run. I don't need any code examples to start. What I'm wondering is that I think I would put this code in a class in my model (Dll) and store the list of displayed CategoryId's in session. Is this a good solution or should I go another way? Thank you for you help

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