Added informative error message for 'Cannot filter for a constraint a…

…fter filtering for a specific value': e.g. filter(score=20).filter(score__lt=30).
milesrichardson · Apr 11, 2014 · 728c492 · 728c492
1 parent e6785ea
commit 728c492
Showing 1 changed file with 7 additions and 2 deletions.
diff --git a/parse_rest/query.py b/parse_rest/query.py
@@ -125,8 +125,13 @@ def filter(self, **kw):
             else:
                 if operator == 'relatedTo':
                     self._where['$' + operator] = parse_value
-                else:    
-                    self._where[attr]['$' + operator] = parse_value
+                else:
+                    try:
+                        self._where[attr]['$' + operator] = parse_value
+                    except TypeError:
+                        # self._where[attr] wasn't settable
+                        raise ValueError("Cannot filter for a constraint " +
+                                    "after filtering for a specific value")
         return self
 
     def order_by(self, order, descending=False):