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Fixed #5560 -- Improved the way we create __str__ and __unicode__ met…

…hods in

lazy() objects. This fixes things for Jython and makes the code more readable,
even for CPython. Thanks, Leo Soto.

git-svn-id: bcc190cf-cafb-0310-a4f2-bffc1f526a37
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1 parent 2adcb3f commit bab4fdc9fd1be47575f440816b4dfc422947d368 @malcolmt malcolmt committed
Showing with 7 additions and 9 deletions.
  1. +7 −9 django/utils/
16 django/utils/
@@ -53,7 +53,11 @@ def __init__(self, args, kw):
self._delegate_unicode = unicode in resultclasses
assert not (self._delegate_str and self._delegate_unicode), "Cannot call lazy() with both str and unicode return types."
if self._delegate_unicode:
- self.__unicode__ = self.__unicode_cast
+ # Each call to lazy() makes a new __proxy__ object, so this
+ # doesn't interfere with any other lazy() results.
+ __proxy__.__unicode__ = __proxy__.__unicode_cast
+ elif self._delegate_str:
+ __proxy__.__str__ = __proxy__.__str_cast
def __promise__(self, klass, funcname, func):
# Builds a wrapper around some magic method and registers that magic
@@ -72,14 +76,8 @@ def __wrapper__(*args, **kw):
def __unicode_cast(self):
return self.__func(*self.__args, **self.__kw)
- def __str__(self):
- # As __str__ is always a method on the type (class), it is looked
- # up (and found) there first. So we can't just assign to it on a
- # per-instance basis in __init__.
- if self._delegate_str:
- return str(self.__func(*self.__args, **self.__kw))
- else:
- return Promise.__str__(self)
+ def __str_cast(self):
+ return str(self.__func(*self.__args, **self.__kw))
def __cmp__(self, rhs):
if self._delegate_str:

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