Resolves #122: Fix the bug where mm emitting wrong doc (#163)

* Added .vscode into gitignore file

* Fix the bug where MM returns wrong doc on a certain query.

Author: dongxinEric

.gitignore

@@ -41,6 +41,7 @@ fdbdoc-trace.*
 tags
 *~
 .idea/*
+.vscode/*
 
 smoke_tests/nodejs/node_modules/
 smoke_tests/**/target/

test/correctness/mongo_model.py

@@ -133,6 +133,8 @@ def evaluate(field, query, document, options, debug=False):
     if type(query) == dict:
         if '$not' in query:
             return not evaluate(field, query['$not'], document, options)
+        elif '$eq' in query:
+            return evaluate(field, query['$eq'], document, options)
         elif '$ne' in query:
             return not evaluate(field, query['$ne'], document, options)
         elif '$nin' in query:

test/correctness/smoke/test_core.py

@@ -165,6 +165,9 @@ def test_array13(fixture_collection):
 def test_array14(fixture_collection):
     run_and_match(fixture_collection, ({'E': [2, 2, []]}, [{'E': {'$ne': []}}]))
 
+def test_array15(fixture_collection):
+    run_and_match(fixture_collection, ({'E': [2, 2, [1]]}, [{'E': {'$eq': []}}]))
+
 
 def test_array16(fixture_collection):
     run_and_match(fixture_collection, ({'E': [2, 2, [1]]}, [{'E': [1]}]))