IdentityUserLogin' requires a primary key to be defined error while adding migration [duplicate]

Answer 1

The problem is AppUser is inherited from IdentityUser and their primary keys are not mapped in the method OnModelCreating of dbcontext.

There is already a post available with resolution. Visit the below link

EntityType 'IdentityUserLogin' has no key defined. Define the key for this EntityType

Hope this helps.

Answer 2

To reduce the link to a nutshell, try this:

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    base.OnModelCreating(modelBuilder);

    ...

See Above link for more.

Answer 3

This issue will start coming as soon as you wrote the following lines in DBContext without adding 'base.OnModelCreating(modelBuilder);'

protected override void OnModelCreating(ModelBuilder modelBuilder)
{

}

Two solutions:

1) Don't override OnModelCreating in DbContext Until it becomes necessary

2) Override but call base.OnModelCreating(modelBuilder)