Reverse before limit

moto/dynamodb2/responses.py

@@ -320,14 +320,14 @@ class DynamoHandler(BaseResponse):
             er = 'com.amazonaws.dynamodb.v20111205#ResourceNotFoundException'
             return self.error(er)
 
-        limit = self.body.get("Limit")
-        if limit:
-            items = items[:limit]
-
         reversed = self.body.get("ScanIndexForward")
         if reversed is False:
             items.reverse()
 
+        limit = self.body.get("Limit")
+        if limit:
+            items = items[:limit]
+
         result = {
             "Count": len(items),
             "Items": [item.attrs for item in items],

tests/test_dynamodb2/test_dynamodb_table_with_range_key.py

@@ -570,6 +570,30 @@ def test_query_with_global_indexes():
     list(results).should.have.length_of(0)
 
 
+@mock_dynamodb2
+def test_reverse_query():
+    conn = boto.dynamodb2.layer1.DynamoDBConnection()
+
+    table = Table.create('messages', schema=[
+        HashKey('subject'),
+        RangeKey('created_at', data_type='N')
+    ])
+
+    for i in range(10):
+        table.put_item({
+            'subject': "Hi",
+            'created_at': i
+        })
+
+    results = table.query_2(subject__eq="Hi",
+                            created_at__lt=6,
+                            limit=4,
+                            reverse=True)
+
+    expected = map(Decimal, [5, 4, 3, 2])
+    [r['created_at'] for r in results].should.equal(expected)
+
+
 @mock_dynamodb2
 def test_lookup():
     from decimal import Decimal