Avoid 'Discriminator' with AspNetUsers, AspNetRoles, & AspNetUserRoles

Question

I am extending IdentityUser, IdentityUserRole, and IdentityRole like this:

public class ApplicationUser : IdentityUser         


        

Answer 1

Your context is inheriting IdentityDbContext which in turn inherits IdentityDbContext. TUser in this case is your ApplicationUser, but the role type is IdentityRole.

Thus the base class fluent configuration registers IdentityRole as entity. When you register the derived ApplicationRole as entity, EF Core treats that as TPH (Table Per Hierarchy) Inheritance Strategy which is implemented with single table having Discriminator column.

To fix the issue, simply use the proper base generic IdentityDbContext. Since you also have a custom IdentityUserRole derived type, you should use the one with all generic type arguments - IdentityDbContext:

public class SmartAccountingSetUpContext : IdentityDbContext
<
    ApplicationUser, // TUser
    ApplicationRole, // TRole
    string, // TKey
    IdentityUserClaim, // TUserClaim
    ApplicationIdentityUserRole, // TUserRole,
    IdentityUserLogin, // TUserLogin
    IdentityRoleClaim, // TRoleClaim
    IdentityUserToken // TUserToken
>
{
    // ...
}