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  • Where'd My Data Go? (and/or...How Do I Get Rid of It?)

    - by David Paquette
    Want to get a better idea of how cascade deletes work in Entity Framework Code First scenarios? Want to see it in action? Stick with us as we quickly demystify what happens when you tell your data context to nuke a parent entity. This post is authored by Calgary .NET User Group Leader David Paquette with help from Microsoft MVP in Asp.Net James Chambers. We got to spend a great week back in March at Prairie Dev Con West, chalk full of sessions, presentations, workshops, conversations and, of course, questions.  One of the questions that came up during my session: "How does Entity Framework Code First deal with cascading deletes?". James and I had different thoughts on what the default was, if it was different from SQL server, if it was the same as EF proper and if there was a way to override whatever the default was.  So we built a set of examples and figured out that the answer is simple: it depends.  (Download Samples) Consider the example of a hockey league. You have several different entities in the league including games, teams that play the games and players that make up the teams. Each team also has a mascot.  If you delete a team, we need a couple of things to happen: The team, games and mascot will be deleted, and The players for that team will remain in the league (and therefore the database) but they should no longer be assigned to a team. So, let's make this start to come together with a look at the default behaviour in SQL when using an EDMX-driven project. The Reference – Understanding EF's Behaviour with an EDMX/DB First Approach First up let’s take a look at the DB first approach.  In the database, we defined 4 tables: Teams, Players, Mascots, and Games.  We also defined 4 foreign keys as follows: Players.Team_Id (NULL) –> Teams.Id Mascots.Id (NOT NULL) –> Teams.Id (ON DELETE CASCADE) Games.HomeTeam_Id (NOT NULL) –> Teams.Id Games.AwayTeam_Id (NOT NULL) –> Teams.Id Note that by specifying ON DELETE CASCADE for the Mascots –> Teams foreign key, the database will automatically delete the team’s mascot when the team is deleted.  While we want the same behaviour for the Games –> Teams foreign keys, it is not possible to accomplish this using ON DELETE CASCADE in SQL Server.  Specifying a ON DELETE CASCADE on these foreign keys would cause a circular reference error: The series of cascading referential actions triggered by a single DELETE or UPDATE must form a tree that contains no circular references. No table can appear more than one time in the list of all cascading referential actions that result from the DELETE or UPDATE – MSDN When we create an entity data model from the above database, we get the following:   In order to get the Games to be deleted when the Team is deleted, we need to specify End1 OnDelete action of Cascade for the HomeGames and AwayGames associations.   Now, we have an Entity Data Model that accomplishes what we set out to do.  One caveat here is that Entity Framework will only properly handle the cascading delete when the the players and games for the team have been loaded into memory.  For a more detailed look at Cascade Delete in EF Database First, take a look at this blog post by Alex James.   Building The Same Sample with EF Code First Next, we're going to build up the model with the code first approach.  EF Code First is defined on the Ado.Net team blog as such: Code First allows you to define your model using C# or VB.Net classes, optionally additional configuration can be performed using attributes on your classes and properties or by using a Fluent API. Your model can be used to generate a database schema or to map to an existing database. Entity Framework Code First follows some conventions to determine when to cascade delete on a relationship.  More details can be found on MSDN: If a foreign key on the dependent entity is not nullable, then Code First sets cascade delete on the relationship. If a foreign key on the dependent entity is nullable, Code First does not set cascade delete on the relationship, and when the principal is deleted the foreign key will be set to null. The multiplicity and cascade delete behavior detected by convention can be overridden by using the fluent API. For more information, see Configuring Relationships with Fluent API (Code First). Our DbContext consists of 4 DbSets: public DbSet<Team> Teams { get; set; } public DbSet<Player> Players { get; set; } public DbSet<Mascot> Mascots { get; set; } public DbSet<Game> Games { get; set; } When we set the Mascot –> Team relationship to required, Entity Framework will automatically delete the Mascot when the Team is deleted.  This can be done either using the [Required] data annotation attribute, or by overriding the OnModelCreating method of your DbContext and using the fluent API. Data Annotations: public class Mascot { public int Id { get; set; } public string Name { get; set; } [Required] public virtual Team Team { get; set; } } Fluent API: protected override void OnModelCreating(DbModelBuilder modelBuilder) { modelBuilder.Entity<Mascot>().HasRequired(m => m.Team); } The Player –> Team relationship is automatically handled by the Code First conventions. When a Team is deleted, the Team property for all the players on that team will be set to null.  No additional configuration is required, however all the Player entities must be loaded into memory for the cascading to work properly. The Game –> Team relationship causes some grief in our Code First example.  If we try setting the HomeTeam and AwayTeam relationships to required, Entity Framework will attempt to set On Cascade Delete for the HomeTeam and AwayTeam foreign keys when creating the database tables.  As we saw in the database first example, this causes a circular reference error and throws the following SqlException: Introducing FOREIGN KEY constraint 'FK_Games_Teams_AwayTeam_Id' on table 'Games' may cause cycles or multiple cascade paths. Specify ON DELETE NO ACTION or ON UPDATE NO ACTION, or modify other FOREIGN KEY constraints. Could not create constraint. To solve this problem, we need to disable the default cascade delete behaviour using the fluent API: protected override void OnModelCreating(DbModelBuilder modelBuilder) { modelBuilder.Entity<Mascot>().HasRequired(m => m.Team); modelBuilder.Entity<Team>() .HasMany(t => t.HomeGames) .WithRequired(g => g.HomeTeam) .WillCascadeOnDelete(false); modelBuilder.Entity<Team>() .HasMany(t => t.AwayGames) .WithRequired(g => g.AwayTeam) .WillCascadeOnDelete(false); base.OnModelCreating(modelBuilder); } Unfortunately, this means we need to manually manage the cascade delete behaviour.  When a Team is deleted, we need to manually delete all the home and away Games for that Team. foreach (Game awayGame in jets.AwayGames.ToArray()) { entities.Games.Remove(awayGame); } foreach (Game homeGame in homeGames) { entities.Games.Remove(homeGame); } entities.Teams.Remove(jets); entities.SaveChanges();   Overriding the Defaults – When and How To As you have seen, the default behaviour of Entity Framework Code First can be overridden using the fluent API.  This can be done by overriding the OnModelCreating method of your DbContext, or by creating separate model override files for each entity.  More information is available on MSDN.   Going Further These were simple examples but they helped us illustrate a couple of points. First of all, we were able to demonstrate the default behaviour of Entity Framework when dealing with cascading deletes, specifically how entity relationships affect the outcome. Secondly, we showed you how to modify the code and control the behaviour to get the outcome you're looking for. Finally, we showed you how easy it is to explore this kind of thing, and we're hoping that you get a chance to experiment even further. For example, did you know that: Entity Framework Code First also works seamlessly with SQL Azure (MSDN) Database creation defaults can be overridden using a variety of IDatabaseInitializers  (Understanding Database Initializers) You can use Code Based migrations to manage database upgrades as your model continues to evolve (MSDN) Next Steps There's no time like the present to start the learning, so here's what you need to do: Get up-to-date in Visual Studio 2010 (VS2010 | SP1) or Visual Studio 2012 (VS2012) Build yourself a project to try these concepts out (or download the sample project) Get into the community and ask questions! There are a ton of great resources out there and community members willing to help you out (like these two guys!). Good luck! About the Authors David Paquette works as a lead developer at P2 Energy Solutions in Calgary, Alberta where he builds commercial software products for the energy industry.  Outside of work, David enjoys outdoor camping, fishing, and skiing. David is also active in the software community giving presentations both locally and at conferences. David also serves as the President of Calgary .Net User Group. James Chambers crafts software awesomeness with an incredible team at LogiSense Corp, based in Cambridge, Ontario. A husband, father and humanitarian, he is currently residing in the province of Manitoba where he resists the urge to cheer for the Jets and maintains he allegiance to the Calgary Flames. When he's not active with the family, outdoors or volunteering, you can find James speaking at conferences and user groups across the country about web development and related technologies.

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  • Découvrir la solution d'exploration de données structuré et non structuré

    - by David lefranc
    Explorer et découvrir l’information… Nous vous proposons un atelier découverte pour vous permettre d’explorer toute type de données grâce à la solution Oracle Endeca . Quand : 7 Décembre 2012 De 9h30 à 12h30  Lieu : Oracle 15 Boulevard Charles de gaulle 92715 Colombes Pour s'inscrire : [email protected] Réalisé pour des utilisateurs métiers, cet atelier vous permettera en une demi journée , de découvrir Oracle Endeca Information Discovery afin de : Comprendre et explorer toute information venant de différents horizons ( Big Data, réseaux sociaux, forums, sondages, blogs..) Découvrir en quoi et comment OEID est un complément à des solutions de BI classiques Par une navigation simple et rapide, vous découvrirez combien il est facile de trouver des réponses à des questions imprévues en utilisant OEID sans formation préalable. Utilisez la recherche et la navigation guidée pour voir comment les informations structurées et non structurées peuvent être rapidement réunies pour dégager la valeur cachée. Explorer toutes vos données dans n'importe quel format et à partir de n'importe quelle source, y compris les médias sociaux, documents, fichiers,…. Pouvoir découvrir et explorer vos données sans référentiel pour permettre aux utilisateurs d’être autonome et d’analyser leurs propres données de manière rapide Élaborer une stratégie visant à accroître la valeur des données de l'entreprise tout en réduisant le coût total de possession Découvrez l'incroyable performance d’ Endeca sur Oracle Exalytics la machine In Memory AgendaAprès une introduction sur la solution Oracle information Endeca, suivi d’un atelier, vous verrez comment il est facile de: Utiliser la navigation guidée et le moteur de recherche pour explorer les données structurées et non structurées intégrer rapidement les nouvelles sources de données comme les médias sociaux Construire de nouvelles interfaces utilisateur tout en découvrant l’information répondre rapidement aux besoins changeants des entreprises et des environnements de données

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  • The Silverlightning Talks

    - by Brian Genisio's House Of Bilz
    Tomorrow, I will be speaking in Grand Rapids at the Silverlight Firestarter.  It is a one day event intended to get people bootstrapped with Silverlight.  I will be giving the “Advanced Topics” presentation.  I have decided to run it as a series of “Lightning Talks”.  The idea is to give a lot of breadth so you know that the topic exists and move quickly between them.  To go along with the talks, here are a bunch of links that you might find useful: MVVM http://msdn.microsoft.com/en-us/magazine/dd458800.aspx http://msdn.microsoft.com/en-us/magazine/dd419663.aspx http://channel9.msdn.com/shows/Continuum/MVVM/ http://karlshifflett.wordpress.com/2008/11/08/learning-wpf-m-v-vm/ http://johnpapa.net/silverlight/5-minute-overview-of-mvvm-in-silverlight/ Good MVVM Frameworks http://www.galasoft.ch/mvvm/getstarted/ http://caliburn.codeplex.com/Wikipage   Prism http://compositewpf.codeplex.com/ http://mtaulty.com/CommunityServer/blogs/mike_taultys_blog/archive/2009/10/27/prism-and-silverlight-screencasts-on-channel-9.aspx http://www.grumpydev.com/2009/07/04/why-shouldn%E2%80%99t-i-use-prism/   Unit Testing Silverlight Unit Testing Framework http://code.msdn.microsoft.com/silverlightut http://silverlight.codeplex.com/ http://www.jeff.wilcox.name/2008/03/silverlight2-unit-testing/ NUnit Testing with Silverlight http://weblogs.asp.net/nunitaddin/archive/2008/05/01/silverlight-nunit-projects.aspx Useful Testing Tools http://testdriven.net/ http://nunit.org/ http://code.google.com/p/moq/ http://www.ayende.com/projects/rhino-mocks.aspx   Navigation Framework http://www.silverlightshow.net/items/The-Silverlight-3-Navigation-Framework.aspx http://www.silverlight.net/learn/videos/silverlight-videos/navigation-framework/   Farseer Physics Engine http://farseerphysics.codeplex.com/Wikipage http://physicshelper.codeplex.com/Wikipage http://www.andybeaulieu.com/Home/tabid/67/Default.aspx   Windows Phone 7 http://www.silverlight.net/getstarted/devices/windows-phone/ http://msdn.microsoft.com/en-us/library/ff402535%28VS.92%29.aspx

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  • Atelier gratuit : Découvrir la solution d'exploration de données structuré et non structuré

    - by David lefranc
    Explorer et découvrir l’information… Nous vous proposons un atelier découverte pour vous permettre d’explorer toute type de données grace à la solution Oracle Endeca Information Discovery. Quand : 7 Décembre 2012 De 9h30 à 12h30  Lieu : Oracle 15 Boulevard Charles de gaulle 92715 Colombes Pour s'inscrire : [email protected] Réalisé pour des utilisateurs métiers, cet atelier vous permettera en une demi journée , de découvrir Oracle Endeca Information Discovery afin de : Comprendre et explorer toute information venant de différents horizons ( Big Data, réseaux sociaux, forums, sondages, blogs..) Découvrir en quoi et comment OEID est un complément à des solutions de BI classiques Par une navigation simple et rapide, vous découvrirez combien il est facile de trouver des réponses à des questions imprévues en utilisant OEID sans formation préalable. Utilisez la recherche et la navigation guidée pour voir comment les informations structurées et non structurées peuvent être rapidement réunies pour dégager la valeur cachée. Explorer toutes vos données dans n'importe quel format et à partir de n'importe quelle source, y compris les médias sociaux, documents, fichiers,…. Pouvoir découvrir et explorer vos données sans référentiel pour permettre aux utilisateurs d’être autonome et d’analyser leurs propres données de manière rapide Élaborer une stratégie visant à accroître la valeur des données de l'entreprise tout en réduisant le coût total de possession Découvrez l'incroyable performance d’ Endeca sur Oracle Exalytics la machine In Memory Agenda Après une introduction sur la solution Oracle information Endeca, suivi d’un atelier, vous verrez comment il est facile de: Utiliser la navigation guidée et le moteur de recherche pour explorer les données structurées et non structurées intégrer rapidement les nouvelles sources de données comme les médias sociaux Construire de nouvelles interfaces utilisateur tout en découvrant l’information répondre rapidement aux besoins changeants des entreprises et des environnements de données Quand Lieu 7 Décembre 2012 De 9h30 à 12h30 Oracle 15 Boulevard Charles de gaulle 92715 Colombes

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  • What is your strategy for converting RC builds into retail?

    - by Matthew PK
    We're trying to implement a strategy for how we transition our builds from RC to released retail code. When we label a build as a release candidate, we send it to QA for regression. If they approve it, that RC then becomes our released retail code. I liked the idea of "obvious" labeling of versions so that a user knows whether they have a beta or an RC or retail code... where you would have some obvious watermark in non-retail code (think Windows 7 where the RC or non-genuine builds watermark in the bottom right). ... but it seemed strange to us to manipulate the project (to remove the watermark) once it passed regression. If QA certified version a.b.c.d then our retail code should be that same version, not a.b.c.d+1 what strategies have you employed to clearly label non-release software versions without incrementing your build to disable the watermarks in your retail code? One idea I've considered is writing your build to look for a signed file in the installer archive... non-release code wouldn't include this file and so the app would know to display a watermark. But even this seems like QA is then working with non-release code. Ideas?

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  • Top Fusion Apps User Experience Guidelines & Patterns That Every Apps Developer Should Know About

    - by ultan o'broin
    We've announced the availability of the Oracle Fusion Applications user experience design patterns. Developers can get going on these using the Design Filter Tool (or DeFT) to select the best pattern for their context of use. As you drill into the patterns you will discover more guidelines from the Applications User Experience team and some from the Rich Client User Interface team too that are also leveraged in Fusion Apps. All are based on the Oracle Application Development Framework components. To accelerate your Fusion apps development and tailoring, here's some inside insight into the really important patterns and guidelines that every apps developer needs to know about. They start at a broad Fusion Apps information architecture level and then become more granular at the page and task level. Information Architecture: These guidelines explain how the UI of an Oracle Fusion application is constructed. This enables you to understand where the changes that you want to make fit into the oveall application's information architecture. Begin with the UI Shell and Navigation guidelines, and then move onto page-level design using the Work Areas and Dashboards guidelines. UI Shell Guideline Navigation Guideline Introduction to Work Areas Guideline Dashboards Guideline Page Content: These patterns and guidelines cover the most common interactions used to complete tasks productively, beginning with the core interactions common across all pages, and then moving onto task-specific ones. Core Across All Pages Icons Guideline Page Actions Guideline Save Model Guideline Messages Pattern Set Embedded Help Pattern Set Task Dependent Add Existing Object Pattern Set Browse Pattern Set Create Pattern Set Detail on Demand Pattern Set Editing Objects Pattern Set Guided Processes Pattern Set Hierarchies Pattern Set Information Entry Forms Pattern Set Record Navigation Pattern Set Transactional Search and Results Pattern Group Now, armed with all this great insider information, get developing some great-looking, highly usable apps! Let me know in the comments how things go!

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  • Adding complexity by generalising: how far should you go?

    - by marcog
    Reference question: http://stackoverflow.com/questions/4303813/help-with-interview-question The above question asked to solve a problem for an NxN matrix. While there was an easy solution, I gave a more general solution to solve the more general problem for an NxM matrix. A handful of people commented that this generalisation was bad because it made the solution more complex. One such comment is voted +8. Putting aside the hard-to-explain voting effects on SO, there are two types of complexity to be considered here: Runtime complexity, i.e. how fast does the code run Code complexity, i.e. how difficult is the code to read and understand The question of runtime complexity is something that requires a better understanding of the input data today and what it might look like in the future, taking the various growth factors into account where necessary. The question of code complexity is the one I'm interested in here. By generalising the solution, we avoid having to rewrite it in the event that the constraints change. However, at the same time it can often result in complicating the code. In the reference question, the code for NxN is easy to understand for any competent programmer, but the NxM case (unless documented well) could easily confuse someone coming across the code for the first time. So, my question is this: Where should you draw the line between generalising and keeping the code easy to understand?

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  • What is the best way to track / record the current programming project you work on? [duplicate]

    - by user2424160
    This question already has an answer here: Methodology for Documenting Existing Code Base 6 answers When do you start documenting the code? 13 answers Where should a programmer explain the extended logic behind the code? 5 answers I have been in this problem for long time and I want to know how it's done in real / big companies project? Suppose I have the project to build a website. Now I divide the project into sub tasks and do it. But you know that suppose I have task1 in hand like export the page to pdf. Now I spend 3 days to do that , came across various problems, many Stack Overflow questions and in the end I solve it. Now 4 months after someone told me that there is some error in the code. Now by that I completely forgot about (60%) of how I did it and why I do this way. I document the code but I can't write the whole story of that in the code. Then I have to spend much time on code to find what was the problem so that I added this line etc. I want to know that is there any way that i can log steps in completing the project. So that I can see how I end up with code, what errors I got, what questions I asked on SO and etc. How people do it in real time? Which software to use? I know in our project management software called JIRA we have tasks but that does not cover what steps I took to solve that tasks. What is the best way so that when I look back at my 2 year old project, I know how I solve particular task?

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  • Adding complexity by generalising: how far should you go?

    - by marcog
    Reference question: http://stackoverflow.com/questions/4303813/help-with-interview-question The above question asked to solve a problem for an NxN matrix. While there was an easy solution, I gave a more general solution to solve the more general problem for an NxM matrix. A handful of people commented that this generalisation was bad because it made the solution more complex. One such comment is voted +8. Putting aside the hard-to-explain voting effects on SO, there are two types of complexity to be considered here: Runtime complexity, i.e. how fast does the code run Code complexity, i.e. how difficult is the code to read and understand The question of runtime complexity is something that requires a better understanding of the input data today and what it might look like in the future, taking the various growth factors into account where necessary. The question of code complexity is the one I'm interested in here. By generalising the solution, we avoid having to rewrite it in the event that the constraints change. However, at the same time it can often result in complicating the code. In the reference question, the code for NxN is easy to understand for any competent programmer, but the NxM case (unless documented well) could easily confuse someone coming across the code for the first time. So, my question is this: Where should you draw the line between generalising and keeping the code easy to understand?

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  • Custom Key Flexfield (KFF) in Oracle Applications

    - by Manoj Madhusoodanan
    In this blog I will explain how to create a custom KFF.I am using XXCUST_KFF_DEMO table to capture the KFF code combinations. Following steps needs to perform. 1) Register the XXCUST_KFF_DEMO table.Click here to see the code. Verify the table has created successfully. Navigation: Application Developer > Application > Database > Table 2) Register the Key Flexfield. Navigation : Application Developer > Flexfield > Key Flexfields 3) Define the structure and segments.  Navigation:  Application Developer > Flexfield > Key Flexfield Segments Click on Segments button. Save the created Information.Check the Allow Dynamic Inserts check box if you want to create the combination from the KFF display window. Once you complete all the changes check the Freeze Flexfield Definition check box. 4) Create a sequence XXCUST_KFF_DEMO_S. 5) Try to create KFF item through OAF or Forms. Here I am using a page based on table XXCUST_KFF_TRN. You can see the output below.

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  • Inheritance vs containment while extending a large legacy project

    - by Flot2011
    I have got a legacy Java project with a lot of code. The code uses MVC pattern and is well structured and well written. It also has a lot of unit tests and it is still actively maintained (bug fixing, minor features adding). Therefore I want to preserve the original structure and code style as much as possible. The new feature I am going to add is a conceptual one, so I have to make my changes all over the code. In order to minimize changes I decided not to extend existing classes but to use containment: class ExistingClass { // .... existing code // my code adding new functionality private ExistingClassExtension extension = new ExistingClassExtension(); public ExistingClassExtension getExtension() {return extension;} } ... // somewhere in code ExistingClass instance = new ExistingClass(); ... // when I need a new functionality instance.getExtension().newMethod1(); All functionality that I am adding is inside a new ExistingClassExtension class. Actually I am adding only these 2 lines to each class that needs to be extended. By doing so I also do not need to instantiate new, extended classes all over the code and I may use existing tests to make sure there is no regression. However my colleagues argue that in this situation doing so isn't a proper OOP approach, and I need to inherit from ExistingClass in order to add a new functionality. What do you think? I am aware of numerous inheritance/containment questions here, but I think my question is different.

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  • What is the value to checking in broken unit tests?

    - by Adam W.
    While there are ways of keeping unit tests from being executed, what is the value of checking in broken unit tests? I will use a simple example. Case sensitivity. The current code is Case Sensitive. A valid input into the method is "Cat" and it would return an enum of Animal.Cat. However, the desired functionality of the method should not be case sensitive. So if the method described was passed "cat" it could possibly return something like Animal.Null instead of Animal.Cat and the unit test would fail. Though a simple code change would make this work, a more complex issue may take weeks to fix, but identifying the bug with a unit test could be a less complex task. The application currently being analyzed has 4 years of code that "works". However, recent discussions regarding unit tests has found flaws in the code. Some just need explicit implementation documentation (ex. case sensitive or not), or code that does not execute the bug based on how it is currently called. But unit tests can be created executing specific scenarios that will cause the bug to be seen and are valid inputs. What is the value of checking in unit tests that exercise the bug until someone can get around to fixing the code? Should this unit test be flagged with ignore, priority, category etc, to determine whether a build was successful based on tests executed? Eventually the unit test should be created to execute the code once someone fixes it. On one hand it shows that identified bugs have not been fixed. On the other, there could be hundreds of failed unit tests showing up in the logs and weeding through the ones that should fail vs. failures due to a code check-in would be difficult to find.

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  • SEO for maps-based websites that require user interaction

    - by j0nes
    I have a website that basically shows a lot of locations worldwide on a Google Maps like interface. The map itself is built using the Leaflet library and Open Street Map tiles. In the map, I show markers at each location I have. There is a popup window when I click on a marker that shows additional information and contains links to "detail" pages for this location. I fetch the location data for the viewpoint from an AJAX call from my server, so the additional information is not available in the HTML page itself. The detail pages are the pages my users are interested in. My normal users load the map, search the location they are interested in, click on a marker and click on a link in the popup window. However for search engines, this might look different. As this navigation pattern relies on user interaction, I think they might not be able to find the details page. My questions: Are search engines able to follow a navigation path like outlined above? How can I improve the navigation for search engines? (For example showing textual links below the map, sitemaps...) How important are internal links for SEO?

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  • Why does Android make good coding so difficult?

    - by metacircle
    my daily work is writing tools in C#/WPF. After over more than 1 year on the job now, I came to love MVVM, IoC Containers, XAML (and more). It's pure fun to write code, since simple, maintainable and extendable code just comes naturally when you follow a few basic patterns. In my free time I really want to write some apps, mainly for my own personal use. I want to write apps for fun and not to make money or anything, that being said, paying an annual fee to be allowed to use my own apps on my own device is a total no-go for me. So I am not able to code for Windows Phone and am also not able to use Xamarin on Android (which is sad since Visual Studio + Resharper is programmers heaven). So I am stuck with Android "classic" Java development. Everytime I sit down at home to create an app, or improve some of the code I have already written I get annoyed very quick because getting good, decoupled code is just so hard to accomplish. It feels like everything you have to do in Android to create a good architecture is a workaround instead of being the way things are meant to be. Writing the UI in xml is fine, but everything else is one big code mess. Even all the tutorials do all their coding in the code behind. For 'hello world' this is fine, but for anything bigger this gets messy very very quick. This is where the fun for me ends. It's just no fun anymore because I just spend 90% of my time refactoring and thinking of workarounds how to make my code more maintainable with all the restrictions Android puts on me. Am I missing a crucial part or is this just the way Android is meant to be? Do you have any suggestions how to learn 'the fun way' of Android programming.

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  • What is the value of checking in failing unit tests?

    - by Adam W.
    While there are ways of keeping unit tests from being executed, what is the value of checking in failing unit tests? I will use a simple example: Case Sensitivity. The current code is case sensitive. A valid input into the method is "Cat" and it would return an enum of Animal.Cat. However, the desired functionality of the method should not be case sensitive. So if the method described was passed "cat" it could possibly return something like Animal.Null instead of Animal.Cat and the unit test would fail. Though a simple code change would make this work, a more complex issue may take weeks to fix, but identifying the bug with a unit test could be a less complex task. The application currently being analyzed has 4 years of code that "works". However, recent discussions regarding unit tests have found flaws in the code. Some just need explicit implementation documentation (ex. case sensitive or not), or code that does not execute the bug based on how it is currently called. But unit tests can be created executing specific scenarios that will cause the bug to be seen and are valid inputs. What is the value of checking in unit tests that exercise the bug until someone can get around to fixing the code? Should this unit test be flagged with ignore, priority, category etc, to determine whether a build was successful based on tests executed? Eventually the unit test should be created to execute the code once someone fixes it. On one hand it shows that identified bugs have not been fixed. On the other, there could be hundreds of failed unit tests showing up in the logs and weeding through the ones that should fail vs. failures due to a code check-in would be difficult to find.

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  • What is the value of checking in failing unit tests?

    - by user20194
    While there are ways of keeping unit tests from being executed, what is the value of checking in failing unit tests? I will use a simple example: Case Sensitivity. The current code is case sensitive. A valid input into the method is "Cat" and it would return an enum of Animal.Cat. However, the desired functionality of the method should not be case sensitive. So if the method described was passed "cat" it could possibly return something like Animal.Null instead of Animal.Cat and the unit test would fail. Though a simple code change would make this work, a more complex issue may take weeks to fix, but identifying the bug with a unit test could be a less complex task. The application currently being analyzed has 4 years of code that "works". However, recent discussions regarding unit tests have found flaws in the code. Some just need explicit implementation documentation (ex. case sensitive or not), or code that does not execute the bug based on how it is currently called. But unit tests can be created executing specific scenarios that will cause the bug to be seen and are valid inputs. What is the value of checking in unit tests that exercise the bug until someone can get around to fixing the code? Should this unit test be flagged with ignore, priority, category etc, to determine whether a build was successful based on tests executed? Eventually the unit test should be created to execute the code once someone fixes it. On one hand it shows that identified bugs have not been fixed. On the other, there could be hundreds of failed unit tests showing up in the logs and weeding through the ones that should fail vs. failures due to a code check-in would be difficult to find.

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  • How do I map a composite primary key in Entity Framework 4 code first?

    - by jamesfm
    I'm getting to grips with EF4 code first, and liking it so far. But I'm having trouble mapping an entity to a table with a composite primary key. The configuration I've tried looks like this: public SubscriptionUserConfiguration() { Property(u => u.SubscriptionID).IsIdentity(); Property(u => u.UserName).IsIdentity(); } Which throws this exception: Unable to infer a key for entity type 'SubscriptionUser'. What am I missing?

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  • What jquery code or plugin would I use to update the position of an element?

    - by Breadtruck
    I am using a jquery plugin from [ FilamentGroup ] called DateRangePicker. I have a simple form with two text inputs for the start and end date that I bind the DateRangePicker to using this $('input.tbDate').daterangepicker({ dateFormat: 'mm/dd/yy', earliestDate: new Date(minDate), latestDate: new Date(maxDate), datepickerOptions: { changeMonth: true, changeYear: true, minDate: new Date(minDate), maxDate: new Date(maxDate) } }); I have a collapsible table above this form that when shown, moves the form and the elements that the daterangepicker plugin is bound to, down lower on the page, but the daterangepicker appears to keep the position from when it was actually created. What code could I put in the daterangepicker's onShow Callback to update its position to be next to the element is was initially bound to? Or is there some specific jquery method or plugin that I could chain to the daterangepicker plugin so that it will update its position correctly. This would come in handy for some other plugins that I use that don't seem to keep their position relative to other elements correctly either.

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  • Eclipse complains android:scrollbars and android:fadingEdge do not allow Strings - includes code.

    - by emanuel
    Having a problem in Eclipse with regards to an XML file. Eclipse complains that android:scrollbars and android:fadingEdge do not allow Strings. I checked the Android developer site and they do in fact accept strings in the xml file. A related question posed had the problem where there was a missing :android after xmlns. As you can see from the code the line beginning with xmlns is correct I believe. Here is the complete file contents: <?xml version="1.0" encoding="UTF-8"?> <com.example.todolist.TodoListItemView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:padding="10dp" android:scrollbars="verticle" android:textColor="@color/notepad_text" android:fadingEdge="verticle" />

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  • Does anybody know of existing code to read a mork file (Thunderbird Address Book)?

    - by bruceatk
    I have the need to read the Thunderbird address book on the fly. It is stored in a file format called Mork. Not a pleasant file format to read. I found a 1999 article explaining the file format. I would love to know if someone already has gone through this process and could make the code available. I found mork.pl by Jamie Zawinski (he worked on Netscape Navigator), but I was hoping for a .NET solution. I'm hoping StackOverflow will come to the rescue, because this just seems like a waste of my time to write something to read this file format when it should be so simple. I love the comments that Jamie put in his perl script. Here is my favorite part: # Let me make it clear that McCusker is a complete barking lunatic. # This is just about the stupidest file format I've ever seen.

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  • Why the following Java code has different outputs each time?

    - by Maxood
    I don't know about threads in Java. I like to know what is happening in this code because each time it runs, it produces a different output: public class TwoThreadsDemo{ public static void main(String[] args) { new SimpleThread("Java Programmer").start(); new SimpleThread("Java Programmer").start(); } } class SimpleThread extends Thread{ public SimpleThread(String str) { super(str); } public void run() { for (int i=0;i<10;i++) { System.out.println(i + " " + getName()); try { sleep((long)(Math.random()*1000)); } catch(InterruptedException e) { } } System.out.println("Done!" + getName()); } }

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  • What is the C# equivalent of this Excel VBA code for Shapes?

    - by code4life
    This is the VBA code for an Excel template, which I'm trying to convert to C# in a VSTO project I'm working on. By the way, it's a VSTO add-in: Dim addedShapes() As Variant ReDim addedShapes(1) addedShapes(1) = aBracket.Name ReDim Preserve addedShapes(UBound(addedShapes) + 1) addedShapes(UBound(addedShapes)) = "unique2" Set tmpShape = Me.Shapes.Range(addedShapes).Group At this point, I'm stumped by the addedShapes(), not sure what this is all about. Update: Matti mentioned that addedShapes() represents a variant array in VBA. So now I'm wondering what the contents of addedShapes() should be. Would this be the correct way to call the Shapes.Range() call in C#? List<string> addedShapes = new List<string>(); ... Shape tmpShape = worksheet.Shapes.get_Range (addedShapes.Cast<object>().ToArray()).Group(); I'd appreciate anyone who's worked with VBA and C# willing to make a comment on my question & problem!

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  • What are the worst working conditions you have written code in?

    - by Saurabh Sawant
    There are good times and there are worst times. I recently had to write code in a hot room with temperatures near 107°F (42°C); nothing to sit on; 64 Kbps inconsistent internet connection; warm water for drinking and a lot of distractions and interruptions. I am sure many people have been in similar situations and I would like to know your experiences. More experiences at HackerNews about the same topic. Even more experiences at Slashdot about the same subject.

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  • Programmatically change the default code page in Windows XP? (from Delphi)

    - by Duncan
    Could anyone advise how to programmatically change the default Windows XP code page (I'm doing this from Delphi)? (This would be the equivalent of going into Control Panel - Regional Settings - Language for non-Unicode applications). In this case, I want to switch to Chinese (PRC) and so am writing to the following registry strings: HKLM\SYSTEM\CurrentControlSet\Control\Nls\CodePage\ ACP=936 MACCP=10008 OEMCP=936 (Which is exactly what changing the non-Unicode codepage drop down in Control Panel does). There must be another setting which I need to change - and I'd prefer to use a Win API call (if available) rather than writing to the registry myself. I've also tried setting HKLM\SYSTEM\CurrentControlSet\Control\Nls\Language\ Default=0804 (Chinese PRC) to no avail. I don't want to change the 'locale' per se as this will also change time / date settings, separators, etc. etc. This is because I'm using an ANSI application that needs to render Chinese characters, and I'm writing a tool to automatically switch the system show the characters (while leaving other aspects of the UI intact). Thanks! Duncan

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  • How can I sign an ActiveX control with a code signing certificate and be a verified publisher?

    - by davidcl
    I'm trying to sing an ActiveX control with a code signing certificate issued by Thawte. I was able to successfully sign the control using signtool.exe. When I look at the file properties, it says "The certificate in the signature cannot be verified." When I view the certificate it says "Windows does not have enough information to verify the certificate." On the certification path tab, it says "The issuer of this certificate cannot be found." In internet explorer, the certificate is recognized as signed but the user receives warnings that the publisher is not verified. I've tried creating a single PFX file containing my certificate along with the root and intermediate certificates that chain to my Thawte developer certificate, and then re-signing the control using that PFX file. No dice. Any suggestions?

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