Entity Framework Core - Composite and Foreign Keys as Primary Key

Question

I am using EF Core. I have a class with 3 columns primary key, and this is used on other class and add 1 new primary key (4 primary key) How to create the relationship on OnModelCreating ?

public class Head
{
    public string Id1 { get; set; }
    public string Id2 { get; set; }
    public string Id3 { get; set; }

    public List<Details> Details { get; set; }
}

public class Details
{
    public string Id1 { get; set; } -- foreign key and primary key
    public string Id2 { get; set; } -- foreign key and primary key
    public string Id3 { get; set; } -- foreign key and primary key
    public string Id4 { get; set; } -- primary key
}

I hope help me to resolve this problem using EF Core

Answer 1

Inside your OnModelCreating method you can do something like this,

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    modelBuilder.Entity<Head>()
        .HasMany(header => header.Details)
        .WithMany()
        .HasForeignKey(details => new { details.Id1, details.Id2, details.Id3 });
}

Here HasMany() method and WithMany() methods are used to configure a many-to-many relationship between the Head and Details entitites.

Entity Framework Core - Composite and Foreign Keys as Primary Key

Question

1 answers

solution1
0 2022-12-27 14:24:46

Entity Framework Core - Composite and Foreign Keys as Primary Key

Question

1 answers

solution1 0 2022-12-27 14:24:46

solution1
0 2022-12-27 14:24:46