entity-framework-4.1

I have two entities with many to many relationship like this: class author { public int AuthorID{get;set;} public string Name{get;set;} public virtual ICollection<book> books{get;set;} } class book { public int BookID{get;set;} public string Name{get;set;} public virtual ICollection<author> authors{get;set;} } and I have an intermediate table named Bookauthor defined like this: BookAuthor: int int AuthorID int BookID How to map this using FluentAPI Thanks!! This was problematic with EDMX but with EF 4.1 fluent API you can map it : modelBuilder.Entity<book>() .HasMany(b => b.authors) .WithMany

I have two classes, the Group class has a many to many relationship with the User class (representing the groups a user belongs to) and then the group also has a relationship of one to many with the user class (representing the owner of a group). How can I map this? public class User { public int Id { get; set; } public string Avatar { get; set; } public string Name { get; set; } public string Message { get; set; } public virtual ICollection<Group> OwnedGroups { get; set; } public virtual ICollection<Group> Groups { get; set; } } public class Group { public int Id { get; set; } public DateTime

i have this model and configuration public class Person { public int? FatherId { get; set; } public virtual Person Father { get; set; } public int? MotherId { get; set; } public virtual Person Mother { get; set; } public virtual List<Person> Childs { get; set; } } class PersonConfiguration : EntityTypeConfiguration<Person> { public PersonConfiguration() { HasOptional(e => e.Father).WithMany(e => e.Childs) .HasForeignKey(e => e.FatherId); HasOptional(e => e.Mother).WithMany(e => e.Childs) .HasForeignKey(e => e.MotherId); } } and i get this error where the type is initial. Schema specified is

I have a class that have a relationship with itself: public class Person { public long ID { get; set; } public string Name { get; set; } public virtual Person Mother { get; set; } public virtual Person Father { get; set; } } When EF 4.1 is trying to map this class I'm getting the follow error: 'Unable to determine the principal end of an association between the types 'Model.Person' and 'Model.person'. The principal end of this association must be explicitly configured using either the relationship fluent API or data annotations.' I already tried the solution of the topic EF 4.1 - Model

I'm using EF 4.1 code first. Running into a very weird situation: Database does not exist, code is executed and as soon as the code wants to execute a query against the repository (using also repository pattern) MyRepsitory.Get(whereClause) i'm getting this error: Cannot open database "MyDatabase" requested by the login. The login failed. Login failed for user 'sa'. OK! So i tried to find what it is caused by and did the following: set a break point at the line which caused the error and as soon as this line was hit, i issued from the debugging (watch) window another query against the

i'm trying do some Entity Framework Code First programming to an existing database .. but I keep seeing this code in my Sql Profiler :- SELECT TOP ( 1 ) [Extent1].[Id] AS [Id], [Extent1].[ModelHash] AS [ModelHash] FROM [dbo].[EdmMetadata] AS [Extent1] ORDER BY [Extent1].[Id] DESC What the hell is this EdmMetadata table and why do is my EF code trying to grab the Id and ModelHash from there? Remember, I'm trying to work against an existing DB. Cheers :) Ladislav Mrnka There is no Code-First against existing database. If you have database you are doing Database-first. In such case your mapping

This question is related to this : My repository method has this code: public IEnumerable<ApplicationPositionHistory> GetApplicationPositionHistories(int applicantId, int positionId) { return context.ApplicationsPositionHistory.Where(d => d.applicantPosition.ApplicantID == applicantId && d.applicantPosition.PositionID == positionId).Include(o => o.applicantPosition) ; } My Html has this code: @foreach (var item in Model) { <tr> <td> @Html.DisplayFor(modelItem => item.applicantPosition.Applicant.name) </td> <td> @Html.DisplayFor(modelItem => item.applicantPosition.Position.name) </td> The full