EntityFrameworkCore.CompositeAttributes

Adds support for Composite Entity Keys using attributes to Entity Framework Core.

Stability

This library is super early access and may not be fully functional. If you have something to contribute, please do!

Examples

DbContext

public class ExampleDbContext : CompositeKeyDbContext
{
    public DbSet<CompositeEntity> CompositeEnitities { get; set; }
    public DbSet<CompositeSubEntity> CompositeSubEnitities { get; set; }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        base.OnModelCreating(ModelBuilder modelBuilder);
    }
}

Base Entity

public class CompositeEnitity
{
    [CompositeKey]
    public Int32 KeyPart1 { get; set; }

    [CompositeKey]
    public Int32 KeyPart2 { get; set; }

    [CompositeInverseProperty(nameof(CompositeSubEntity.CompositeEnitity))]
    public virtual HashSet<CompositeSubEntity> CompositeSubEnitities { get; set; }
}

Dependant Enitity

public class CompositeSubEntity
{
    [Key]
    public Int32 Id { get; set; }

    public Int32 ParentKeyPart1 { get; set; }

    public Int32 ParentKeyPart2 { get; set; }

    [CompositeForeignKey(nameof(ParentKeyPart1), nameof(ParentKeyPart2))]
    public virtual CompositeEnitity CompositeEnitity { get; set; }
}