Fixed #12049 - LazyObject-wrapped User breaks queries in template tags

Thanks to chipx86 for the report and patch.



git-svn-id: http://code.djangoproject.com/svn/django/trunk@11634 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/utils/functional.py

@@ -297,6 +297,11 @@ class SimpleLazyObject(LazyObject):
     def __init__(self, func):
         """
         Pass in a callable that returns the object to be wrapped.
+
+        If copies are made of the resulting SimpleLazyObject, which can happen
+        in various circumstances within Django, then you must ensure that the
+        callable can be safely run more than once and will return the same
+        value.
         """
         self.__dict__['_setupfunc'] = func
         # For some reason, we have to inline LazyObject.__init__ here to avoid
@@ -307,5 +312,14 @@ class SimpleLazyObject(LazyObject):
         if self._wrapped is None: self._setup()
         return str(self._wrapped)
 
+    def __deepcopy__(self, memo):
+        if self._wrapped is None:
+            result = self.__class__(self._setupfunc)
+            memo[id(self)] = result
+            return result
+        else:
+            import copy
+            return copy.deepcopy(self._wrapped, memo)
+
     def _setup(self):
         self._wrapped = self._setupfunc()