CSHARP-1664 Adding AsQuerableBinder to infoBinders, getting the dynamically created expression , some unit tests

Author: alex687

src/MongoDB.Driver/Linq/ExpressionHelper.cs

@@ -22,6 +22,11 @@ internal static class ExpressionHelper
     {
         public static LambdaExpression GetLambda(Expression node)
         {
+            if (node.NodeType == ExpressionType.Constant && ((ConstantExpression)node).Value is LambdaExpression)
+            {
+                return (LambdaExpression)((ConstantExpression)node).Value;
+            }
+
             return (LambdaExpression)StripQuotes(node);
         }
 

src/MongoDB.Driver/Linq/Processors/EmbeddedPipeline/EmbeddedPipelineBinder.cs

@@ -52,6 +52,7 @@ static EmbeddedPipelineBinder()
             infoBinder.Register(new ToListBinder(), ToListBinder.GetSupportedMethods());
             infoBinder.Register(new UnionBinder(), UnionBinder.GetSupportedMethods());
             infoBinder.Register(new WhereBinder(), WhereBinder.GetSupportedMethods());
+            infoBinder.Register(new AsQuerableBinder(), AsQuerableBinder.GetSupportedMethods());
 
             var nameBinder = new NameBasedMethodCallBinder<EmbeddedPipelineBindingContext>();
             nameBinder.Register(new ContainsBinder(), ContainsBinder.IsSupported, ContainsBinder.SupportedMethodNames);

tests/MongoDB.Driver.Tests/Linq/MongoQueryableTests.cs

@@ -1446,6 +1446,18 @@ public void Where_method_with_predicated_any()
                 "{ $match: { 'G.D': \"Don't\" } }");
         }
 
+
+        [Test]
+        public void AsQuerable_method_inside_where()
+        {
+            var query = CreateQuery()
+                .Where(x => x.G.AsQueryable().Any(g => g.D == "Don't"));
+
+            Assert(query,
+                1,
+                "{ $match: { 'G.D': \"Don't\" } }");
+        }
+
         private List<T> Assert<T>(IMongoQueryable<T> queryable, int resultCount, params string[] expectedStages)
         {
             var executionModel = (AggregateQueryableExecutionModel<T>)queryable.GetExecutionModel();