EF4 CTP5 Database First + Many-To-Many Relation (Error) - entity-framework

Question

I'm pretty sure it's something regarding hidden conventions, but I always get an error when trying to map a many-to-many relation to an existing database.
Here is the simplest example:
[Table("ALRole", SchemaName = "AL")]
public class Role
{
public int ID { get; set; }
public string Name { get; set; }
public virtual ICollection<User> Users { get; set; }
}
[Table("ALUser", SchemaName = "AL")]
public class User
{
public int ID { get; set; }
public string Name { get; set; }
public virtual ICollection<Role> Roles { get; set; }
}
I got the usual three tables in the db: the first two are obvious, and the third is created with this script:
CREATE TABLE AL.ALUsersRoles
(
RoleID int NOT NULL,
UserID int NOT NULL,
CONSTRAINT PK_ALUserRole PRIMARY KEY(RoleID, UserID),
CONSTRAINT FK_ALUserRole_RoleID FOREIGN KEY(RoleID) REFERENCES AL.ALRole(ID),
CONSTRAINT FK_ALUserRole_UserID FOREIGN KEY(UserID) REFERENCES AL.ALUser(ID)
)
Now I try to map the many-to-many relation, with code like this:
// ...I'm in the EntityTypeConfiguration-derived class (User)
HasMany(u => u.Roles)
.WithMany(r => r.Users)
.Map(m =>
{
m.MapLeftKey(u => u.ID, "UserID");
m.MapRightKey(r => r.ID, "RoleID");
ToTable("ALUsersRoles", "AL");
});
I tried all the possibile combinations and variations in this code, but I always get the error:
{"Invalid column name 'Name'.\r\nInvalid ...and so on...
So I think it must be the table that is not created correctly.
Any ideas?
Thanks in advance
Andrea
P.S.: I stripped down some of my code, so maybe there can be some small typo...

Answer 1

well, this works for me same as OP.
//many-to-many between *Users -> Web_User_Rol <- Web_Rol*
modelBuilder.Entity<Users>()
.HasMany(u => u.Web_Rols).WithMany(r => r.Users)
.Map(t=>t.MapLeftKey("user_id")
.MapRightKey("roleID")
.ToTable("Web_User_Rol"));

Answer 2

There is nothing wrong with your object model or fluent API code. I've used them and they perfectly created the desired schema without any exception. I think your problem comes from another entity (perhaps one with a "Name" property) unrelated to what you've shown here. To find that, drop (or rename) your existing database and let Code First create one for you and then compare the 2 databases and see what is different.