Added a unit test to make sure that LINQ queries comparing a property that is stored as an embeded document work. Implemented ToString method in MongoDBRef.

Author: rstam

Change Log v1.4-Driver.txt

@@ -92,6 +92,7 @@ MongoDBRef.cs
 	better argument checking
 	new implementation of !=, ==, Equals and GetHashCode
 	new MongoDBRefSerializer class makes DBRefs queryable from LINQ queries
+	implemented ToString
 
 MongoInsertOptions.cs
 	constructor no longer takes the collection as an argument

Driver/Core/MongoDBRef.cs

@@ -172,6 +172,22 @@ public override int GetHashCode()
             hash = 37 * hash + _id.GetHashCode();
             return hash;
         }
+
+        /// <summary>
+        /// Returns a string representation of the value.
+        /// </summary>
+        /// <returns>A string representation of the value.</returns>
+        public override string ToString()
+        {
+            if (_databaseName == null)
+            {
+                return string.Format("new MongoDBRef(\"{0}\", {1})", _collectionName, _id);
+            }
+            else
+            {
+                return string.Format("new MongoDBRef(\"{0}\", \"{1}\", {2})", _databaseName, _collectionName, _id);
+            }
+        }
     }
 
     /// <summary>

DriverOnlineTests/Linq/SelectQueryTests.cs

@@ -2740,6 +2740,29 @@ public void TestWhereDBRefDatabaseNameEqualsDb()
             Assert.AreEqual(1, Consume(query));
         }
 
+        [Test]
+        public void TestWhereDBRefEquals()
+        {
+            var query = from c in _collection.AsQueryable<C>()
+                        where c.DBRef == new MongoDBRef("db", "c", 1)
+                        select c;
+
+            var translatedQuery = MongoQueryTranslator.Translate(query);
+            Assert.IsInstanceOf<SelectQuery>(translatedQuery);
+            Assert.AreSame(_collection, translatedQuery.Collection);
+            Assert.AreSame(typeof(C), translatedQuery.DocumentType);
+
+            var selectQuery = (SelectQuery)translatedQuery;
+            Assert.AreEqual("(C c) => (c.DBRef == new MongoDBRef(\"db\", \"c\", 1))", ExpressionFormatter.ToString(selectQuery.Where));
+            Assert.IsNull(selectQuery.OrderBy);
+            Assert.IsNull(selectQuery.Projection);
+            Assert.IsNull(selectQuery.Skip);
+            Assert.IsNull(selectQuery.Take);
+
+            Assert.AreEqual("{ \"dbref\" : { \"$ref\" : \"c\", \"$id\" : 1, \"$db\" : \"db\" } }", selectQuery.BuildQuery().ToJson());
+            Assert.AreEqual(1, Consume(query));
+        }
+
         [Test]
         public void TestWhereDBRefIdEquals1()
         {