protected override void OnModelCreating(ModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
modelBuilder.Entity <BookTags>(BookTag =>
{
BookTag.HasKey(ur => new { ur.BookId, ur.TagId });
BookTag.HasOne(u => u.Book).WithMany(r => r.BookTags).HasForeignKey(bc => bc.BookId);
BookTag.HasOne(u => u.Tag).WithMany(r => r.BookTags).HasForeignKey(bc => bc.TagId);
});
//modelBuilder.Entity<Book>(t =>
//{
// t.HasDatabaseGeneratedOption(DatabaseGeneratedOption.None);
//});
//.HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
}
