Fix the postgresql json test.

Use CustomField as an indicator for the underlying postgresql type.

Author: jeffgabhart

src/ServiceStack.OrmLite.PostgreSQL.Tests/PostgreSqlJsonTests.cs

@@ -55,11 +55,14 @@ public void Can_save_complex_types_as_JSON()
                 db.Insert(row);
 
                 var result = db.Select<ModelWithJsonType>(
-                    "complex_type_json->'sub_type'->>'name' = 'SubType2'");
+                    "complex_type_json->'SubType'->>'Name' = 'SubType2'");
+
+                db.GetLastSql().Print();
 
                 Assert.That(result.Count, Is.EqualTo(1));
-                Assert.That(result[0].Id, Is.EqualTo(2));
-                Assert.That(result[0].ComplexTypeJson.SubType, Is.EqualTo("SubType2"));
+                Assert.That(result[0].Id, Is.EqualTo(1));
+                Assert.That(result[0].ComplexTypeJson.Id, Is.EqualTo(2));
+                Assert.That(result[0].ComplexTypeJson.SubType.Name, Is.EqualTo("SubType2"));
             }
         }
     }

src/ServiceStack.OrmLite.PostgreSQL/PostgreSQLDialectProvider.cs

@@ -3,6 +3,7 @@
 using System.Data;
 using System.Text;
 using Npgsql;
+using NpgsqlTypes;
 using ServiceStack.Text;
 
 namespace ServiceStack.OrmLite.PostgreSQL
@@ -324,5 +325,15 @@ public override long InsertAndGetLastInsertId<T>(IDbCommand dbCmd)
 
             return dbCmd.ExecLongScalar();
         }
+        public override void SetParameter(FieldDefinition fieldDef, IDbDataParameter p)
+        {
+            if (fieldDef.CustomFieldDefinition == "json")
+            {
+                p.ParameterName = this.GetParam(SanitizeFieldNameForParamName(fieldDef.FieldName));
+                ((NpgsqlParameter) p).NpgsqlDbType = NpgsqlDbType.Json;
+                return;
+            }
+            base.SetParameter(fieldDef, p);
+        }
     }
 }