[Django] #12876: maximum recursion error when caching querysets on models

[Django]

#12876: maximum recursion error when caching querysets on models
---------------------------+------------------------------------------------
 Reporter:  zbyte64        |       Owner:  nobody    
   Status:  new            |   Milestone:            
Component:  Uncategorized  |     Version:  1.2-beta  
 Keywords:                 |       Stage:  Unreviewed
Has_patch:  0              |  
---------------------------+------------------------------------------------
 The following test case causes a runtime exception against django 1.2 beta
 1:

 {{{
 from django.test import TestCase
 from django.db import models

 class TestModel(models.Model):
     def cachedmethod(self):
         if not hasattr(self, '_cachedmethod'):
             self._cachedmethod =
 RelatedModel.objects.all().filter(test_model=self)
         return self._cachedmethod

 class RelatedModel(models.Model):
     test_model = models.ForeignKey(TestModel)
     category = models.CharField(max_length=50)

 class dummy(object):
     def __init__(self, parent):
         self.parent = parent

     def cachedmethod(self):
         if not hasattr(self, '_cachedmethod'):
             self._cachedmethod =
 RelatedModel.objects.all().filter(test_model=self.parent)
         return self._cachedmethod

 class BreakMeTest(TestCase):
     def test_caching(self):
         parent = TestModel()
         parent.save()
         related = RelatedModel(category='foo', test_model=parent)
         related.save()

         adummy = dummy(parent)
         adummy.cachedmethod()
         adummy.cachedmethod().filter(category='foo') #this doesn't break
 it
         parent.cachedmethod()
         parent.cachedmethod().filter(category='foo') #this breaks it

 }}}

-- 
Ticket URL: <http://code.djangoproject.com/ticket/12876>
Django <http://code.djangoproject.com/>
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