This test demonstrates the problem with selecting using a custom serialized enum

Author: BruceCowan-AI

tests/ServiceStack.OrmLite.Tests/Expression/ExpressionUsingCustomSerializedEnumTests.cs

@@ -0,0 +1,102 @@
+using System;
+using System.Collections.Generic;
+using System.Data;
+using NUnit.Framework;
+using ServiceStack.DataAnnotations;
+using ServiceStack.Text;
+
+namespace ServiceStack.OrmLite.Tests.Expression
+{
+    public enum ActivityType
+    {
+        Unknown = 0,
+        Unspecified,
+        HavingFun,
+        Working
+    }
+
+    public class Activity
+    {
+        [AutoIncrement]
+        public int Id { get; set; }
+        public ActivityType ActivityType { get; set; }
+        public string Comment { get; set; }
+    }
+
+    public class ExpressionUsingCustomSerializedEnumTests : ExpressionsTestBase
+    {
+        [Test]
+        public void Can_select_on_custom_serialized_enum()
+        {
+            using (var db = OpenDbConnection())
+            {
+                var expected = Init(db);
+
+                var unknownActivities = db.Select<Activity>(
+                    s => s.ActivityType == expected.ActivityType
+                      && s.Comment == expected.Comment);
+
+                Assert.That(unknownActivities.Count, Is.EqualTo(1));
+            }
+        }
+
+        private static Activity Init(IDbConnection db)
+        {
+            EnumSerializer.Configure();
+            
+            db.DropAndCreateTable<Activity>();
+
+            var activities = new []
+                {
+                    new Activity {ActivityType = ActivityType.Unknown, Comment = "know nothing about this"},
+                    new Activity {ActivityType = ActivityType.Unspecified, Comment = "know we don't know about this"},
+                    new Activity {ActivityType = ActivityType.HavingFun, Comment = "want to be doing this"},
+                };
+            db.InsertAll(activities);
+            return activities[0];
+        }
+    }
+
+    public class EnumSerializer
+    {
+        public static void Configure()
+        {
+            var type = typeof(ActivityType);
+            InvokeStaticGenericMethod(type, "ConfigureEnumSerialization");
+        }
+
+        private static object InvokeStaticGenericMethod(Type genericType, string methodName)
+        {
+            return InvokeGenericMethod(genericType, methodName, null);
+        }
+
+        private static object InvokeGenericMethod(Type genericType, string methodName, object obj)
+        {
+            return typeof(EnumSerializer).GetMethod(methodName).MakeGenericMethod(genericType).Invoke(obj, null);
+        }
+
+        public static void ConfigureEnumSerialization<TEnum>()
+        {
+            DefaultEnumValues.Add(typeof(TEnum), GetDefault<TEnum>());
+            JsConfig<TEnum>.SerializeFn = NonDefaultSerializer;
+            JsConfig<TEnum>.DeSerializeFn = NonDefaultDeSerializer<TEnum>;
+        }
+
+        private static readonly Dictionary<Type, object> DefaultEnumValues = new Dictionary<Type, object>();
+
+        private static string NonDefaultSerializer<TEnum>(TEnum value)
+        {
+            return value.Equals(DefaultEnumValues[typeof(TEnum)]) ? null : value.ToString();
+        }
+
+        private static TEnum NonDefaultDeSerializer<TEnum>(string value)
+        {
+            return (String.IsNullOrEmpty(value) ? (TEnum)DefaultEnumValues[typeof(TEnum)] : (TEnum)Enum.Parse(typeof(TEnum), value, true));
+        }
+
+        private static T GetDefault<T>()
+        {
+            return default(T);
+        }
+    }
+}

tests/ServiceStack.OrmLite.Tests/ServiceStack.OrmLite.Tests.csproj

@@ -119,6 +119,7 @@
     <Compile Include="CaptureSqlFilterTests.cs" />
     <Compile Include="CustomSqlTests.cs" />
     <Compile Include="DateTimeOffsetTests.cs" />
+    <Compile Include="Expression\ExpressionUsingCustomSerializedEnumTests.cs" />
     <Compile Include="Expression\FromExpressionTests.cs" />
     <Compile Include="Expression\MethodExpressionTests.cs" />
     <Compile Include="Expression\SqlExpressionTests.cs" />