[Django] #24654: infinite loop caused by ordering, triggered by relational primary key construct

[Django]

#24654: infinite loop caused by ordering, triggered by relational primary key
construct
----------------------------------------------+--------------------
     Reporter:  elmbeech                      |      Owner:  nobody
         Type:  Bug                           |     Status:  new
    Component:  Database layer (models, ORM)  |    Version:  master
     Severity:  Normal                        |   Keywords:
 Triage Stage:  Unreviewed                    |  Has patch:  0
Easy pickings:  0                             |      UI/UX:  0
----------------------------------------------+--------------------
 = Source Code =
 == models.py file ==

 {{{#!python
 from django.db import models

 class Organism( models.Model ):
     organism = models.SlugField( primary_key=True )
     class Meta:
         ordering = ["organism"]


 class TheLoop( models.Model ):
     loop = models.SlugField( primary_key=True )
     target_organism = models.ForeignKey( Organism )
     host_organism = models.ForeignKey( Organism )
     class Meta:
         ordering = ["target_organism","host_organism"]  #"loop"

 class InfinitLoop( models.Model):
     infinity = models.SlugField( primary_key=True )
     loop = models.ForeignKey( TheLoop )
     class Meta:
         ordering = ["loop"]  #"infinity"
 }}}


 == test.py file ==

 {{{#!python
 from django.test import TestCase
 from .models import  InfinitLoop , TheLoop

 class InfinitLoopTests( TestCase ):

     def test_infinitloop( self ):
         #print( TheLoop.objects.all() )
         print( InfinitLoop.objects.all() )
 }}}


 = Trace Back =
 {{{
 (djangovenv) JOSHUA ~/src/django/tests $ PYTHONPATH=..:$PYTHONPATH python
 runtests.py infinitloop
 Testing against Django installed in '/Users/buchere/src/django/django'
 Creating test database for alias 'default'...
 Creating test database for alias 'other'...
 E
 ======================================================================
 ERROR: test_infinitloop (infinitloop.test.InfinitLoopTests)
 ----------------------------------------------------------------------
 Traceback (most recent call last):
   File "/Users/buchere/src/django/tests/infinitloop/test.py", line 8, in
 test_infinitloop
     print( InfinitLoop.objects.all() )
   File "/Users/buchere/src/django/django/db/models/query.py", line 234, in
 __repr__
     data = list(self[:REPR_OUTPUT_SIZE + 1])
   File "/Users/buchere/src/django/django/db/models/query.py", line 258, in
 __iter__
     self._fetch_all()
   File "/Users/buchere/src/django/django/db/models/query.py", line 1061,
 in _fetch_all
     self._result_cache = list(self.iterator())
   File "/Users/buchere/src/django/django/db/models/query.py", line 52, in
 __iter__
     results = compiler.execute_sql()
   File "/Users/buchere/src/django/django/db/models/sql/compiler.py", line
 824, in execute_sql
     sql, params = self.as_sql()
   File "/Users/buchere/src/django/django/db/models/sql/compiler.py", line
 373, in as_sql
     extra_select, order_by, group_by = self.pre_sql_setup()
   File "/Users/buchere/src/django/django/db/models/sql/compiler.py", line
 49, in pre_sql_setup
     order_by = self.get_order_by()
   File "/Users/buchere/src/django/django/db/models/sql/compiler.py", line
 285, in get_order_by
     field, self.query.get_meta(), default_order=asc))
   File "/Users/buchere/src/django/django/db/models/sql/compiler.py", line
 570, in find_ordering_name
     order, already_seen))
   File "/Users/buchere/src/django/django/db/models/sql/compiler.py", line
 564, in find_ordering_name
     raise FieldError('Infinite loop caused by ordering.')
 django.core.exceptions.FieldError: Infinite loop caused by ordering.

 ----------------------------------------------------------------------
 Ran 1 test in 0.002s

 FAILED (errors=1)
 Destroying test database for alias 'default'...
 Destroying test database for alias 'other'...
 (djangovenv) JOSHUA ~/src/django/tests $
 }}}

--
Ticket URL: <https://code.djangoproject.com/ticket/24654>
Django <https://code.djangoproject.com/>
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