10.3 Definig EF Core models -> Adding tables to the Northwind database context class

Chapter10/WorkingWithEFCore/WorkingWithEFCore/Northwind.cs

@@ -1,9 +1,14 @@
 using Microsoft.EntityFrameworkCore;
 using static System.Console;
+
 namespace Packt.Shared;
 
 public class Northwind : DbContext
 {
+    // These properties map to tables in database
+    public DbSet<Category>? Categories { get; set; }
+    public DbSet<Product>? Products { get; set; }
+
     protected override void OnConfiguring(
         DbContextOptionsBuilder optionsBuilder)
     {
@@ -17,10 +22,28 @@ public class Northwind : DbContext
         else
         {
             string connection = "Data Source=.;" +
-              "Initial Catalog=Northwind;" +
+                                "Initial Catalog=Northwind;" +
-              "Integrated Security=true;" +
+                                "Integrated Security=true;" +
-              "MultipleActiveResultSets=true;";
+                                "MultipleActiveResultSets=true;";
             optionsBuilder.UseSqlServer(connection);
         }
     }
-}
+
+    protected override void OnModelCreating(
+        ModelBuilder modelBuilder)
+    {
+        // example of using Fluent API instead of attributes
+        // // to limit the length of a category name to 15
+        modelBuilder.Entity<Category>()
+            .Property(category => category.CategoryName)
+            .IsRequired() // NOT NULL
+            .HasMaxLength(15);
+        if (ProjectConstants.DatabaseProvider == "SQLite")
+        {
+            // added to "fix" the lack of decimal support in SQLite
+            modelBuilder.Entity<Product>()
+                .Property(product => product.Cost)
+                .HasConversion<double>();
+        }
+    }
+}