ShoppingApp/Weifer.Database.EF/DatabaseContext.cs

using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using System.Collections.Generic;
using System.Net;
using Weifer.Database.EF.Entitys;

namespace Weifer.Database.EF
{
    public class DatabaseContext : DbContext
    {
        public DatabaseContext() { }
        public DatabaseContext(DbContextOptions<DatabaseContext> options) : base(options) { }
        public virtual DbSet<Customer> Customers { get; set; }
        public virtual DbSet<ShoppingList> ShoppingLists { get; set; }
        public virtual DbSet<ShoppingItem> ShoppingItems { get; set; }

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            if (!optionsBuilder.IsConfigured)
            {
                var configuration = new ConfigurationBuilder()
                   .SetBasePath(Directory.GetCurrentDirectory())
                   .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
                   .Build();

                var connectionString = configuration.GetConnectionString("ShoppingApp");
                optionsBuilder.UseSqlServer(connectionString);
            }
        }
        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            base.OnModelCreating(modelBuilder);

           
            modelBuilder.Entity<Customer>()
                .HasMany(c => c.ShoppingLists)
                .WithOne() 
                .HasForeignKey(sl => sl.CustomerId) 
                .OnDelete(DeleteBehavior.Cascade); 

            
            modelBuilder.Entity<ShoppingList>()
                .HasMany(sl => sl.ShoppingItems)
                .WithOne() 
                .HasForeignKey(si => si.ShoppingListId) 
                .OnDelete(DeleteBehavior.Cascade); 
        }
    }
}