try to fix problem with many fields with same enum type

Author: cioxideru

samples/SpatialFocus.EntityFrameworkCore.Extensions.SQLiteDemo/Entities/Product.cs

@@ -24,6 +24,8 @@ public Product()
 
 		public ProductCategory ProductCategory { get; set; }
 
+		public ProductCategory ProductCategorySecondField { get; set; }
+
 		public int ProductId { get; set; }
 
 		public DateTime ReleaseDate { get; set; }

src/SpatialFocus.EntityFrameworkCore.Extensions/EnumLookupExtension.cs

@@ -6,6 +6,7 @@
 namespace SpatialFocus.EntityFrameworkCore.Extensions
 {
 	using System;
+	using System.Collections.Generic;
 	using System.Linq;
 	using Microsoft.EntityFrameworkCore;
 	using Microsoft.EntityFrameworkCore.Metadata;
@@ -82,10 +83,21 @@ public static void ConfigureEnumLookup(this ModelBuilder modelBuilder, EnumLooku
 					})
 					.ToArray();
 
+				if (!ConcreteTypeSeededList.Contains(concreteType))
+				{
+					ConcreteTypeSeededList.Add(concreteType);
+				}
+				else
+				{
+					continue;
+				}
+
 				enumLookupBuilder.HasData(data);
 			}
 		}
 
+		private static List<Type> ConcreteTypeSeededList { get; set; } = new List<Type>();
+
 		private static Type GetEnumOrNullableEnumType(this Type propertyType)
 		{
 			if (!propertyType.IsEnumOrNullableEnumType())