Fixed #5487 -- Added deepcopying ability to lazy() objects, along with a test to demonstrate why the previous code failed. Debugging and patch from John Buchanan.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@6276 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/utils/functional.py

@@ -1,3 +1,5 @@
+import copy
+
 def curry(_curried_func, *args, **kwargs):
     def _curried(*moreargs, **morekwargs):
         return _curried_func(*(args+moreargs), **dict(kwargs, **morekwargs))
@@ -101,6 +103,11 @@ def lazy(func, *resultclasses):
             else:
                 raise AssertionError('__mod__ not supported for non-string types')
 
+        def __deepcopy__(self, memo):
+            result = copy.copy(self)
+            memo[id(self)] = result
+            return result
+
     def __wrapper__(*args, **kw):
         # Creates the proxy object, instead of the actual value.
         return __proxy__(args, kw)

tests/regressiontests/forms/regressions.py

@@ -60,6 +60,12 @@ Translated error messages used to be buggy.
 u'<ul class="errorlist"><li>\u041e\u0431\u044f\u0437\u0430\u0442\u0435\u043b\u044c\u043d\u043e\u0435 \u043f\u043e\u043b\u0435.</li></ul>\n<p><label for="id_somechoice_0">\xc5\xf8\xdf:</label> <ul>\n<li><label><input type="radio" id="id_somechoice_0" value="\xc5" name="somechoice" /> En tied\xe4</label></li>\n<li><label><input type="radio" id="id_somechoice_1" value="\xf8" name="somechoice" /> Mies</label></li>\n<li><label><input type="radio" id="id_somechoice_2" value="\xdf" name="somechoice" /> Nainen</label></li>\n</ul></p>'
 >>> deactivate()
 
+Deep copying translated text shouldn't raise an error
+>>> from django.utils.translation import gettext_lazy
+>>> class CopyForm(Form):
+...     degree = IntegerField(widget=Select(choices=((1, gettext_lazy('test')),)))
+>>> f = CopyForm()
+
 #######################
 # Miscellaneous Tests #
 #######################