Fixed #1839, #2415, #2536 -- Fixed a generated name clash that was co…

…mmon in

self-referential and circular relations. A lot of community debugging went into
this fix, so thanks to bmurdock@gmail.com, Marek Kubica, ramiro, Michael
Radziej (the last two giving test cases showing the problem) and James Bennett
(who did the hard work to actually diagnose the true problem and fix it).


git-svn-id: http://code.djangoproject.com/svn/django/trunk@4676 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/models/related.py

@@ -1,7 +1,7 @@
 class BoundRelatedObject(object):
     def __init__(self, related_object, field_mapping, original):
         self.relation = related_object
-        self.field_mappings = field_mapping[related_object.opts.module_name]
+        self.field_mappings = field_mapping[related_object.name]
 
     def template_name(self):
         raise NotImplementedError
@@ -16,7 +16,7 @@ def __init__(self, parent_model, model, field):
         self.opts = model._meta
         self.field = field
         self.edit_inline = field.rel.edit_inline
-        self.name = self.opts.module_name
+        self.name = '%s_%s' % (self.opts.app_label, self.opts.module_name)
         self.var_name = self.opts.object_name.lower()
 
     def flatten_data(self, follow, obj=None):

tests/regressiontests/many_to_one_regress/models.py

@@ -1,13 +1,34 @@
 from django.db import models
 
+# If ticket #1578 ever slips back in, these models will not be able to be
+# created (the field names being lower-cased versions of their opposite
+# classes is important here).
+
 class First(models.Model):
     second = models.IntegerField()
 
 class Second(models.Model):
     first = models.ForeignKey(First, related_name = 'the_first')
 
-# If ticket #1578 ever slips back in, these models will not be able to be
-# created (the field names being lower-cased versions of their opposite
-# classes is important here).
+# Protect against repetition of #1839, #2415 and #2536.
+class Third(models.Model):
+    name = models.CharField(maxlength=20)
+    third = models.ForeignKey('self', null=True, related_name='child_set')
+
+class Parent(models.Model):
+    name = models.CharField(maxlength=20)
+    bestchild = models.ForeignKey('Child', null=True, related_name='favored_by')
+
+class Child(models.Model):
+    name = models.CharField(maxlength=20)
+    parent = models.ForeignKey(Parent)
+
 
-__test__ = {'API_TESTS':""}
+__test__ = {'API_TESTS':"""
+>>> Third.AddManipulator().save(dict(id='3', name='An example', another=None)) 
+<Third: Third object>
+>>> parent = Parent(name = 'fred')
+>>> parent.save()
+>>> Child.AddManipulator().save(dict(name='bam-bam', parent=parent.id))
+<Child: Child object>
+"""}