Is there a way to specify the column order for a many-many table when EF Code first creates it? - entity-framework

Question

I have the following mapping:
public webpages_RolesMap()
{
// Primary Key
this.HasKey(t => t.RoleId);
// Properties
this.Property(t => t.RoleName)
.IsRequired()
.HasMaxLength(256);
// Table & Column Mappings
this.ToTable("webpages_Roles");
this.Property(t => t.RoleId).HasColumnName("RoleId");
this.Property(t => t.RoleName).HasColumnName("RoleName");
// Relationships
this.HasMany(t => t.UserProfiles)
.WithMany(t => t.webpages_Roles)
.Map(m =>
{
m.ToTable("webpages_UsersInRoles");
m.MapLeftKey("RoleId");
m.MapRightKey("UserId");
});
}
When I use Code First then this forces EF to create a webpages_UsersInRoles table that looks like this:
CREATE TABLE [dbo].[webpages_UsersInRoles](
[RoleId] [int] NOT NULL,
[UserId] [int] NOT NULL,
PRIMARY KEY CLUSTERED
(
[RoleId] ASC,
[UserId] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
However the SimpleMembership classes created by Microsoft perform inserts that do not specify the column names and it expects the first column to be UserID and the second RoleId.
INSERT INTO webpages_UsersInRoles VALUES (1,3);
How can I make the mapping above create a table where UserID is column 1 and RoleId is column 2 ?
Note that I already tried adding this:
public partial class UsersInRoles
{
[Key, Column(Order = 0)]
public int UserId { get; set; }
[Key, Column(Order = 1)]
public int RoleId { get; set; }
}
But is seems to ignore this and still create the many to many with column names in the wrong order.

Answer 1

I think you must configure the many-to-many relationship from the other side to change the column order:
// UserProfileMap derived from EntityTypeConfiguration<UserProfile>
public UserProfileMap()
{
// ...
this.HasMany(t => t.webpages_Roles)
.WithMany(t => t.UserProfiles)
.Map(m =>
{
m.ToTable("webpages_UsersInRoles");
m.MapLeftKey("UserId");
m.MapRightKey("RoleId");
});
}