code-first

How would I map something like this using the modelBuilder? Where theres a nullable foreign key referencing the same tables primary key Table: Task taskID int pk taskName varchar parentTaskID int (nullable) FK Task class: public class Task { public int taskID {get;set;} public string taskName {get;set;} public int parentTaskID {get;set;} public Task parentTask {get;set;} } ... modelBuilder.Entity<Task>() .HasOptional(o => o.ParentTask).... The following code gives you the desired schema. Note that you also need to define ParentTaskID foreign key as a nullable integer, like I did below. public

So I have the following model classes on my DbContext: Everytime I render a list of LoanApplication objects I do something like this: var context = new MyContext(); var applications = context.LoanApplications.Where(d => d.PropertyThatIWantToFilter = localVariable); This returns an IQueryable that then I convert to a ViewModel like this on my controller method call: var vm = applications.Select(d => new LoanApplicationViewModel(d)); Inside the LoanApplicationViewModel constructor I accept the entity object and do the corresponding mapping. The thing is that, since the Solicitors collection is a

I have four entities that I would like to translate into database tables via code first fluent api (I'm using a model found at databaseanswers.org), but I'm not certain as to how. The problem I'm having is that SuggestedMenuId is being migrated across two different tables in a Composite key (MenuCourse and CourseRecipeChoice). Here's the message I'm getting: "One or more validation errors were detected during model generation: \tSystem.Data.Entity.Edm.EdmAssociationConstraint: : The number of properties in the Dependent and Principal Roles in a relationship constraint must be identical." Here

How do I get this column as similar to a PERSISTED COMPUTED column in the database? My current attempt (it loads all CompCol rows with null in seed) : public class Call { public Call() { } [Key] public int Id { get; set; } [DatabaseGenerated(DatabaseGeneratedOption.Computed)] public string CompCol { get { return "ABC-" + Convert.ToString(Id).PadLeft(5, '0'); } protected set {} } } The solution I found was to : Make sure auto migrations are turned off. This is so that VS will generate a script (fluent api code) for us to further customise instead of just running it. So in the configuration

EDIT: This happen only on larger scale projects with repositories. Is there anybody using EF4 with CodeFirst approach and using repositories? Please advise me. Hi. Im currently working with EF4 CodeFirst Classes. In my test project I got two classes, Author and Book (author got books). What I'm trying to do is that I have a AddBook in my Author class, but that wont seem to work like I can't Add it to the collection.. here are my classes and two different exceptions. public class Book { public virtual int BookId { get; set; } public virtual string Title { get; set; } public virtual Author

I'm trying to store/save an image in an SQL Compact Edition (CE) database. I declare the field in my Student model as: [Column(TypeName = "image")] public byte[] Photo { get; set; } The database is created with the image data type for the Photo column as can be seen here: The problem is: When I run the app and try to save a Student with a Photo of 3 MB (for example), I get an exception: validationError.ErrorMessage = "The field Photo must be a string or array type with a maximum length of '4000'." SQL Server CE supports these Data Types . In this comparison between SQL Express and SQL Compact

Using Entity Framework Code First CTP5, how do I create a primary key column that are INTs and are not identity columns Preferably not using attributes. Matt Hamilton If you're building your entities using the fluent interface rather than using attributes over the properties, you may be able to use the DatabaseGenerationOption class (from EntityFramework.dll, in the System.ComponentModel.DataAnnotations namespace). I've not tested it, but this is what it would look like: modelBuilder .Entity<Foo>() .Property(f => f.Id) .HasDatabaseGeneratedOption(DatabaseGeneratedOption.None); That answer didn

I've got an entity like this : public class Course { public CultureInfo Culture {get; set;} : } And I want to map just the Name property of CultureInfo to a single column in the table that Entity Framework generates for me. How would I go about this? Currently I've tried looking at the OnModelCreating() method of the DbContext, but I'm not finding anything that is standing out. I'm using Entity Framework 4.1 in and MVC 3 application with a Code First approach. Many thanks. Unfrotunatelly EF can't do it this way. The workaround is defining separate property with the Name which will be mapped to

I am following this article on MSDN. I ported it to EF Code First. public interface IUnitOfWork { IRepository<Employee> Employees { get; } IRepository<TimeCard> TimeCards { get; } void Commit(); } public class HrContext : DbContext { public DbSet<Employee> Employees { get; set; } public DbSet<TimeCard> TimeCards { get; set; } protected override void OnModelCreating(ModelBuilder modelBuilder) { modelBuilder.Entity<Employee>() .HasMany(e => e.TimeCards) .WithOptional(tc => tc.Employee); } } public class SqlRepository<T> : IRepository<T> where T : class { private readonly DbSet<T> entitySet;