protected override void OnModelCreating(ModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
modelBuilder.Entity <User>(d => d.HasKey(u => u.ID)); // Getting user by his ID
modelBuilder.Entity <Details>(d => d.HasKey(i => i.ID)); // Getting details by ID at user with this ID
modelBuilder.Entity <User>().HasOne(u => u.Details).WithOne(d => d.User).HasForeignKey <Details>(d => d.UserID).OnDelete(DeleteBehavior.Cascade); // Cascading delete data from DB
modelBuilder.Entity <UserRole>(UR =>
{
UR.HasKey(ur => new { ur.UserID, ur.RoleID }); // Finding this role by key UserRole + RoleID
UR.HasOne(ur => ur.Role).WithMany(rl => rl.UserRoles).HasForeignKey(ur => ur.RoleID).IsRequired(); // Get Role from UserRoles by RoleID
UR.HasOne(ur => ur.User).WithMany(rl => rl.UserRoles).HasForeignKey(ur => ur.UserID).IsRequired(); // Get User from UserRoles by UserID
}); // This labmda to get user role :)
}