diff --git a/redash/query_runner/mongodb.py b/redash/query_runner/mongodb.py
index 87468e628b..8639ae125f 100644
--- a/redash/query_runner/mongodb.py
+++ b/redash/query_runner/mongodb.py
@@ -68,8 +68,8 @@ def configuration_schema(cls):
                     'type': 'string',
                     'title': 'Replica Set Name'
                 },
-                'required': ['connectionString']
-            }
+            },
+            'required': ['connectionString']
         }
 
     @classmethod
@@ -132,8 +132,8 @@ def run_query(self, query):
         s = None
         if "sort" in query_data and query_data["sort"]:
             s = []
-            for field_name in query_data["sort"]:
-                s.append((field_name, query_data["sort"][field_name]))
+            for field_data in query_data["sort"]:
+                s.append((field_data["name"], field_data["direction"]))
 
         columns = []
         rows = []
@@ -146,6 +146,9 @@ def run_query(self, query):
         else:
             cursor = db[collection].find(q, f)
 
+        if "limit" in query_data and query_data["limit"]:
+            cursor = cursor.limit(query_data["limit"])
+
         for r in cursor:
             for k in r:
                 if _get_column_by_name(columns, k) is None:
@@ -177,4 +180,4 @@ def run_query(self, query):
 
         return json_data, error
 
-register(MongoDB)
\ No newline at end of file
+register(MongoDB)
diff --git a/redash/query_runner/python.py b/redash/query_runner/python.py
index 201819df06..ee0b127048 100644
--- a/redash/query_runner/python.py
+++ b/redash/query_runner/python.py
@@ -36,6 +36,8 @@ def custom_import(name, globals=None, locals=None, fromlist=(), level=0):
 
     raise Exception("'{0}' is not configured as a supported import module".format(name))
 
+def custom_get_item(obj, key):
+    return obj[key]
 
 def get_query_result(query_id):
     try:
@@ -140,6 +142,7 @@ def run_query(self, query):
             safe_builtins["getattr"] = getattr
             safe_builtins["_setattr_"] = setattr
             safe_builtins["setattr"] = setattr
+            safe_builtins["_getitem_"] = custom_get_item
 
             script_locals = { "result" : { "rows" : [], "columns" : [] } }
 
diff --git a/redash/query_runner/script.py b/redash/query_runner/script.py
index e25e27fdba..e7f42f3118 100644
--- a/redash/query_runner/script.py
+++ b/redash/query_runner/script.py
@@ -30,7 +30,7 @@ def annotate_query(cls):
     def __init__(self, configuration_json):
         super(Script, self).__init__(configuration_json)
 
-        # Poor man's protection against running scripts from output the scripts directory
+        # Poor man's protection against running scripts from outside the scripts directory
         if self.configuration["path"].find("../") > -1:
             raise ValidationError("Scripts can only be run from the configured scripts directory")
 
@@ -41,11 +41,13 @@ def run_query(self, query):
 
             query = query.strip()
 
-            script = os.path.join(self.configuration["path"], query)
+            script = os.path.join(self.configuration["path"], query.split(" ")[0])
             if not os.path.exists(script):
                 return None, "Script '%s' not found in script directory" % query
 
-            output = subprocess.check_output(script, shell=False)
+            script = os.path.join(self.configuration["path"], query)
+
+            output = subprocess.check_output(script.split(" "), shell=False)
             if output is not None:
                 output = output.strip()
                 if output != "":
@@ -62,4 +64,4 @@ def run_query(self, query):
 
         return json_data, error
 
-register(Script)
\ No newline at end of file
+register(Script)