Refactored code

Author: Amitpnk

OA/OA.Data/CustomerContext.cs

@@ -0,0 +1,39 @@
+using Microsoft.EntityFrameworkCore;
+using OA.Domain.Entities;
+
+namespace OA.Data
+{
+    public class CustomerContext : DbContext
+    {
+        // This constructor is used of runit testing
+        public CustomerContext()
+        {
+
+        }
+        public CustomerContext(DbContextOptions options) : base(options)
+        {
+            ChangeTracker.QueryTrackingBehavior = QueryTrackingBehavior.NoTracking;
+        }
+
+        public DbSet<Customer> Customers { get; set; }
+        public DbSet<Order> Orders { get; set; }
+        public DbSet<Product> Products { get; set; }
+        public DbSet<Category> Categories { get; set; }
+        public DbSet<Supplier> Suppliers { get; set; }
+
+        protected override void OnModelCreating(ModelBuilder modelBuilder)
+        {
+            modelBuilder.Entity<OrderDetail>().HasKey(o => new { o.OrderId, o.ProductId });
+        }
+
+        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+        {
+            if (!optionsBuilder.IsConfigured)
+            {
+                optionsBuilder
+                .UseSqlServer("DataSource=app.db");
+            }
+
+        }
+    }
+}

OA/OA.Data/OA.Data.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="3.1.5" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\OA.Domain\OA.Domain.csproj" />
+  </ItemGroup>
+
+</Project>

OA/OA.Domain/BaseEntity.cs

@@ -0,0 +1,10 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace OA.Domain
+{
+    public class BaseEntity
+    {
+        [Key]
+        public int Id { get; set; }
+    }
+}

OA/OA.Domain/Entities/Category.cs

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+using System.Collections.Generic;
+
+namespace OA.Domain.Entities
+{
+    public class Category : BaseEntity
+    {
+        public string CategoryName { get; set; }
+        public string Description { get; set; }
+        public List<Product> Products { get; set; }
+    }
+}

OA/OA.Domain/Entities/Customer.cs

@@ -0,0 +1,24 @@
+using System.Collections.Generic;
+
+namespace OA.Domain.Entities
+{
+    public class Customer : BaseEntity
+    {
+        public Customer()
+        {
+            Orders = new List<Order>();
+        }
+        public string CustomerName { get; set; }
+        public string ContactName { get; set; }
+        public string ContactTitle { get; set; }
+        public string Address { get; set; }
+        public string City { get; set; }
+        public string Region { get; set; }
+        public string PostalCode { get; set; }
+        public string Country { get; set; }
+        public string Phone { get; set; }
+        public string Fax { get; set; }
+
+        public List<Order> Orders { get; set; }
+    }
+}

OA/OA.Domain/Entities/Order.cs

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+using System;
+using System.Collections.Generic;
+
+namespace OA.Domain.Entities
+{
+    public class Order : BaseEntity
+    {
+        public Customer Customers { get; set; }
+        public int CustomerId { get; set; }
+        public int EmployeeId { get; set; }
+        public DateTime OrderDate { get; set; }
+        public DateTime RequiredDate { get; set; }
+        public List<OrderDetail> OrderDetails { get; set; }
+
+    }
+}

OA/OA.Domain/Entities/OrderDetail.cs

@@ -0,0 +1,10 @@
+namespace OA.Domain.Entities
+{
+    public class OrderDetail
+    {
+        public int OrderId { get; set; }
+        public int ProductId { get; set; }
+        public Order Orders { get; set; }
+        public Product Product { get; set; }
+    }
+}

OA/OA.Domain/Entities/Product.cs

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+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace OA.Domain.Entities
+{
+    public class Product : BaseEntity
+    {
+        public string ProductName { get; set; }
+
+        [Column(TypeName = "money")]
+        public decimal UnitPrice { get; set; }
+
+    }
+}

OA/OA.Domain/Entities/Supplier.cs

@@ -0,0 +1,10 @@
+using System.Collections.Generic;
+
+namespace OA.Domain.Entities
+{
+    public class Supplier : BaseEntity
+    {
+        public string SupplierName { get; set; }
+        public List<Product> Products { get; set; }
+    }
+}

OA/OA.Domain/OA.Domain.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+</Project>