CSHARP-1487: fixed issue with the type is operator used on the variable in an Any method.

Author: craiggwilson

src/MongoDB.Driver.Tests/Linq/IntegrationTestBase.cs

@@ -55,7 +55,8 @@ private void InsertFirst()
  H = 22,
  I = new[] { "it", "icky" },
  W = 1111
- }
+ },
+ X = new List<E> { new E { F = 10 }, new V { W = 12 } }
  },
  G = new[] {
  new C
@@ -224,6 +225,8 @@ public class C
  public E E { get; set; }
 
  public IEnumerable<C> S { get; set; }
+
+ public IEnumerable<E> X { get; set; }
  }
 
  public class E

src/MongoDB.Driver.Tests/Linq/Translators/PredicateTranslatorTests.cs

@@ -143,6 +143,15 @@ public void Any_with_a_predicate_on_scalars()
  // })));
  }
 
+ [Test]
+ public void Any_with_a_type_is()
+ {
+ Assert(
+ x => x.C.X.Any(y => y is V),
+ 1,
+ "{\"C.X\": {\"$elemMatch\": {\"_t\": \"V\" } } }");
+ }
+
  [Test]
  public void Any_with_local_contains_on_an_embedded_document()
  {
@@ -394,7 +403,7 @@ public void ClassEquals()
  Assert(
  x => x.C == new C { D = "Dexter" },
  0,
- "{C: {D: 'Dexter', E: null, S: null}}");
+ "{C: {D: 'Dexter', E: null, S: null, X: null}}");
  }
 
  [Test]
@@ -403,7 +412,7 @@ public void ClassEqualsMethod()
  Assert(
  x => x.C.Equals(new C { D = "Dexter" }),
  0,
- "{C: {D: 'Dexter', E: null, S: null}}");
+ "{C: {D: 'Dexter', E: null, S: null, X: null}}");
  }
 
  [Test]
@@ -412,7 +421,7 @@ public void ClassNotEquals()
  Assert(
  x => x.C != new C { D = "Dexter" },
  2,
- "{C: {$ne: {D: 'Dexter', E: null, S: null}}}");
+ "{C: {$ne: {D: 'Dexter', E: null, S: null, X: null}}}");
  }
 
  [Test]

src/MongoDB.Driver/Linq/Translators/PredicateTranslator.cs

@@ -1517,7 +1517,7 @@ private FilterDefinition<BsonDocument> TranslateTypeIsQuery(TypeBinaryExpression
 
  var elementName = discriminatorConvention.ElementName;
  IFieldExpression fieldExpression;
- if (TryGetFieldExpression(typeBinaryExpression.Expression, out fieldExpression))
+ if (TryGetFieldExpression(typeBinaryExpression.Expression, out fieldExpression) && !string.IsNullOrEmpty(fieldExpression.FieldName))
  {
  elementName = string.Format("{0}.{1}", fieldExpression.FieldName, elementName);
  }