Libation/Source/DataLayer/Configurations/BookCategoryConfig.cs

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

namespace DataLayer.Configurations;

internal class BookCategoryConfig : IEntityTypeConfiguration<BookCategory>
{
	public void Configure(EntityTypeBuilder<BookCategory> entity)
	{
		entity.HasKey(bc => new { bc.BookId, bc.CategoryLadderId });

		entity.HasIndex(bc => bc.BookId);
		entity.HasIndex(bc => bc.CategoryLadderId);

		entity
			.HasOne(bc => bc.Book)
			.WithMany(b => b.CategoriesLink)
			.HasForeignKey(bc => bc.BookId);

		entity
			.HasOne(bc => bc.CategoryLadder)
			.WithMany(c => c.BooksLink)
			.HasForeignKey(bc => bc.CategoryLadderId);
	}
}