Libation/Source/DataLayer/Configurations/LibraryBookConfig.cs

using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata.Builders;

namespace DataLayer.Configurations;

internal class LibraryBookConfig : IEntityTypeConfiguration<LibraryBook>
{
	public void Configure(EntityTypeBuilder<LibraryBook> entity)
	{
		// to allow same book (incl region) with diff acct.s:
		//
		// this file:
		// - composite key:
		//     entity.HasKey(b => new { b.BookId, b.Account });
		//     entity.HasIndex(b => b.BookId);
		//     entity.HasIndex(b => b.Account);
		// - change the below relationship since Book+LibraryBook would no longer be 1:1
		//
		// other files:
		// - change Book class since Book+LibraryBook would no longer be 1:1
		// - update LibraryBook import code
		// - would likely challenge assumptions throughout Libation which have been true up until now

		entity.HasKey(lb => lb.BookId);

		entity
			.HasOne(lb => lb.Book)
			.WithOne()
			.HasForeignKey<LibraryBook>(lb => lb.BookId);
	}
}