Question

i’ve started working with ASP.NET MVC and using Entity Framework, concretely with SQLite db,
but i’ve got a little problem:

I’ve got a one to many relation, but EF generates wrong query,

SQLite error
no such column: Extent1.Category_CategoryID

so, he uses ModelName as a prefix and it’s wrong.
Is there any convention, which i can remove? Or set off?

thx and sorry for my bad english

// Update, added Category entity

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel.DataAnnotations;


namespace Eshop.Domain.Entities
{
    [Table("Categories")]
    public class Category
    {
        public Int64 CategoryID { get; set; }
        public string Name { get; set; }
        public virtual ICollection<Product> Products { get; set; }
    }
}

// added Product entity

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel.DataAnnotations;

namespace Eshop.Domain.Entities
{
    [Table("Products")]
    public class Product
    {
        public Int64 ProductID { get; set; }
        public string Name { get; set; }
        public decimal Price { get; set; }
        public int CategoryID { get; set; }


    }
}

Answer 1

If you are using Code-First (which I assume) you need to…

• either introduce a navigation property in Product:

  [Table("Products")]
  public class Product
  {
      public Int64 ProductID { get; set; }
      public string Name { get; set; }
      public decimal Price { get; set; }
      public int CategoryID { get; set; }
  
      public virtual Category Category { get; set; }
  }
  

  EF will recognize CategoryID as foreign key then.

• or configure CategoryID as foreign key with Fluent API:

  modelBuilder.Entity<Category>()
      .HasMany(c => c.Products)
      .WithRequired()
      .HasForeignKey(p => p.CategoryID);