Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
-+-
 Reporter:  danbrwn  |Owner:  mitsuhiko
 Type:  Bug  |   Status:  closed
Component:  Database layer   |  Version:
  (models, ORM)  |   Resolution:  fixed
 Severity:  Normal   | Triage Stage:  Ready for
 Keywords:   |  checkin
  foreign,key,quoted,dceu2011|  Needs documentation:  0
Has patch:  1|  Patch needs improvement:  1
  Needs tests:  0|UI/UX:  0
Easy pickings:  0|
-+-

Comment (by Gwildor):

 For anyone else who ran into this: for me this occurred because I had a
 form import in my main `urls.py` file, to pass a form to a built in view
 by Django. That `forms.py` file had a ModelForm and the model it was
 associated with had a foreign key using a string for the model (because of
 earlier import errors). This didn't happen on 1.4, but it occurred when I
 upgraded Django to 1.5.

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
-+-
 Reporter:  danbrwn  |Owner:  mitsuhiko
 Type:  Bug  |   Status:  closed
Component:  Database layer   |  Version:
  (models, ORM)  |   Resolution:  fixed
 Severity:  Normal   | Triage Stage:  Ready for
 Keywords:   |  checkin
  foreign,key,quoted,dceu2011|  Needs documentation:  0
Has patch:  1|  Patch needs improvement:  1
  Needs tests:  0|UI/UX:  0
Easy pickings:  0|
-+-

Comment (by ramiro):

 I've just tested this with a setup like comment:42 suggest: The one pasted
 in comment:8. I did it with both trunk as of now and 1.4.2. The
 problematic setup doesn't even allow me to run syncdb. If I change the
 models/modelform ordering to the one that works, run syncdb and then
 change it back to the problematic one the error message introduced with
 the fix for this ticket is shown inmediately when running the dev server.
 The message is always:

 `ValueError: Cannot create form field for 'ref' yet, because its related
 model 'ClassB' has not been loaded yet`

 I tested with DEBUG set both to True and False.

 Guys, you will need to provide much more detail, as in a simple setup that
 demonstrates the purported regression if you want anyone to dedicate any
 more time to this. Also, please open a new ticket for that, commenting on
 a closed ticket isn't a good way to get things going either.

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
-+-
 Reporter:  danbrwn  |Owner:  mitsuhiko
 Type:  Bug  |   Status:  closed
Component:  Database layer   |  Version:
  (models, ORM)  |   Resolution:  fixed
 Severity:  Normal   | Triage Stage:  Ready for
 Keywords:   |  checkin
  foreign,key,quoted,dceu2011|  Needs documentation:  0
Has patch:  1|  Patch needs improvement:  1
  Needs tests:  0|UI/UX:  0
Easy pickings:  0|
-+-

Comment (by camilonova):

 I got this same error too with Django 1.4.2, uwsgi and nginx

 Maybe the changes were reverted or something?

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
-+-
 Reporter:  danbrwn  |Owner:  mitsuhiko
 Type:  Bug  |   Status:  closed
Component:  Database layer   |  Version:
  (models, ORM)  |   Resolution:  fixed
 Severity:  Normal   | Triage Stage:  Ready for
 Keywords:   |  checkin
  foreign,key,quoted,dceu2011|  Needs documentation:  0
Has patch:  1|  Patch needs improvement:  1
  Needs tests:  0|UI/UX:  0
Easy pickings:  0|
-+-

Comment (by fc@…):

 I just got this error with Django 1.4.2, mod_wsgi and Apache

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
-+-
 Reporter:  danbrwn  |Owner:  mitsuhiko
 Type:  Bug  |   Status:  closed
Component:  Database layer   |  Version:
  (models, ORM)  |   Resolution:  fixed
 Severity:  Normal   | Triage Stage:  Ready for
 Keywords:   |  checkin
  foreign,key,quoted,dceu2011|  Needs documentation:  0
Has patch:  1|  Patch needs improvement:  1
  Needs tests:  0|UI/UX:  0
Easy pickings:  0|
-+-
Changes (by seocam):

 * cc: seocam@… (added)


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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
-+-
 Reporter:  danbrwn  |Owner:  mitsuhiko
 Type:  Bug  |   Status:  closed
Component:  Database layer   |  Version:
  (models, ORM)  |   Resolution:  fixed
 Severity:  Normal   | Triage Stage:  Ready for
 Keywords:   |  checkin
  foreign,key,quoted,dceu2011|  Needs documentation:  0
Has patch:  1|  Patch needs improvement:  1
  Needs tests:  0|UI/UX:  0
Easy pickings:  0|
-+-

Comment (by seocam):

 Still happening to me too.
 I'm using Django 1.3.3 and the steps to reproduce are the same mentioned
 in comment 8.

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
-+-
 Reporter:  danbrwn  |Owner:  mitsuhiko
 Type:  Bug  |   Status:  closed
Component:  Database layer   |  Version:
  (models, ORM)  |   Resolution:  fixed
 Severity:  Normal   | Triage Stage:  Ready for
 Keywords:   |  checkin
  foreign,key,quoted,dceu2011|  Needs documentation:  0
Has patch:  1|  Patch needs improvement:  1
  Needs tests:  0|UI/UX:  0
Easy pickings:  0|
-+-

Comment (by anonymous):

 Replying to [comment:40 auzigog]:
 > I'm also experiencing this in 1.4.1. I can confirm this regression.

 Can you post a simple example demonstrating the issue?

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
-+-
 Reporter:  danbrwn  |Owner:  mitsuhiko
 Type:  Bug  |   Status:  closed
Component:  Database layer   |  Version:
  (models, ORM)  |   Resolution:  fixed
 Severity:  Normal   | Triage Stage:  Ready for
 Keywords:   |  checkin
  foreign,key,quoted,dceu2011|  Needs documentation:  0
Has patch:  1|  Patch needs improvement:  1
  Needs tests:  0|UI/UX:  0
Easy pickings:  0|
-+-

Comment (by auzigog):

 I'm also experiencing this in 1.4.1. I can confirm this regression.

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
-+-
 Reporter:  danbrwn  |Owner:  mitsuhiko
 Type:  Bug  |   Status:  closed
Component:  Database layer   |  Version:
  (models, ORM)  |   Resolution:  fixed
 Severity:  Normal   | Triage Stage:  Ready for
 Keywords:   |  checkin
  foreign,key,quoted,dceu2011|  Needs documentation:  0
Has patch:  1|  Patch needs improvement:  1
  Needs tests:  0|UI/UX:  0
Easy pickings:  0|
-+-
Changes (by simon29):

 * needs_better_patch:  0 => 1
 * version:  1.3 =>


Comment:

 This fix seems to have reverted- ie I'm getting the old str error. I'm on
 c4c7fbcc0d9264beb931b45969fc0d8d655c4f83

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
-+-
 Reporter:  danbrwn  |Owner:  mitsuhiko
 Type:  Bug  |   Status:  closed
Component:  Database layer   |  Version:  1.3
  (models, ORM)  |   Resolution:  fixed
 Severity:  Normal   | Triage Stage:  Ready for
 Keywords:   |  checkin
  foreign,key,quoted,dceu2011|  Needs documentation:  0
Has patch:  1|  Patch needs improvement:  0
  Needs tests:  0|UI/UX:  0
Easy pickings:  0|
-+-

Comment (by ionalchemist):

 I initially put my ModelForms after each respective model and encountered
 this error. After reading
 [https://code.djangoproject.com/ticket/10405#comment:12], that prompted me
 to move all of my ModelForms to the end of my models.py file and voila.
 Easy fix.

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
-+-
   Reporter:  danbrwn|  Owner:  mitsuhiko
   Type:  Bug| Status:  closed
  Milestone: |  Component:  Database layer
Version:  1.3|  (models, ORM)
 Resolution:  fixed  |   Severity:  Normal
   Triage Stage:  Ready for  |   Keywords:
  checkin|  foreign,key,quoted,dceu2011
Needs documentation:  0  |  Has patch:  1
Patch needs improvement:  0  |Needs tests:  0
  UI/UX:  0  |  Easy pickings:  0
-+-
Changes (by jezdez):

 * status:  new => closed
 * resolution:   => fixed


Comment:

 In [16604]:
 {{{
 #!CommitTicketReference repository="" revision="16604"
 Fixed #10405 -- Raise a more useful error if the formfield of a related
 model field can't be created yet because the related model isn't loaded
 yet. Thanks ojii and charstring.
 }}}

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
-+-
   Reporter:  danbrwn|  Owner:  mitsuhiko
   Type:  Bug| Status:  new
  Milestone: |  Component:  Database layer
Version:  1.3|  (models, ORM)
 Resolution: |   Severity:  Normal
   Triage Stage:  Ready for  |   Keywords:
  checkin|  foreign,key,quoted,dceu2011
Needs documentation:  0  |  Has patch:  1
Patch needs improvement:  0  |Needs tests:  0
  UI/UX:  0  |  Easy pickings:  0
-+-

Comment (by funvit@…):

 got that in 1.3

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
-+-
   Reporter:  danbrwn|  Owner:  mitsuhiko
   Type:  Bug| Status:  new
  Milestone: |  Component:  Database layer
Version:  1.3|  (models, ORM)
 Resolution: |   Severity:  Normal
   Triage Stage:  Ready for  |   Keywords:
  checkin|  foreign,key,quoted,dceu2011
Needs documentation:  0  |  Has patch:  1
Patch needs improvement:  0  |Needs tests:  0
  UI/UX:  0  |  Easy pickings:  0
-+-

Comment (by GDorn):

 Small grammar nitpick:

  "it's related model %r has not been loaded yet" % (self.name,
 self.rel.to))

 Should be:

  "its related model %r has not been loaded yet" % (self.name,
 self.rel.to))

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
-+-
   Reporter:  danbrwn|  Owner:  mitsuhiko
   Type:  Bug| Status:  new
  Milestone: |  Component:  Database layer
Version:  1.3|  (models, ORM)
 Resolution: |   Severity:  Normal
   Triage Stage:  Ready for  |   Keywords:
  checkin|  foreign,key,quoted,dceu2011
Needs documentation:  0  |  Has patch:  1
Patch needs improvement:  0  |Needs tests:  0
  UI/UX:  0  |  Easy pickings:  0
-+-

Comment (by camilonova):

 Seems to work fine. Great job.

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
-+-
   Reporter:  danbrwn|  Owner:  mitsuhiko
   Type:  Bug| Status:  new
  Milestone: |  Component:  Database layer
Version:  1.3|  (models, ORM)
 Resolution: |   Severity:  Normal
   Triage Stage:  Ready for  |   Keywords:
  checkin|  foreign,key,quoted,dceu2011
Needs documentation:  0  |  Has patch:  1
Patch needs improvement:  0  |Needs tests:  0
  UI/UX:  0  |  Easy pickings:  0
-+-
Changes (by charstring):

 * stage:  Accepted => Ready for checkin


Comment:

 Not only do the test pass, they fail when applied without the solution.

 All different code-paths I've seen in the reports end in the place of the
 solution.

 So RFC imho.

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
-+-
   Reporter:  danbrwn|  Owner:  mitsuhiko
   Type:  Bug| Status:  new
  Milestone: |  Component:  Database layer
Version:  1.3|  (models, ORM)
 Resolution: |   Severity:  Normal
   Triage Stage:  Accepted   |   Keywords:
Needs documentation:  0  |  foreign,key,quoted,dceu2011
Patch needs improvement:  0  |  Has patch:  1
  UI/UX:  0  |Needs tests:  0
 |  Easy pickings:  0
-+-

Comment (by hvdklauw):

 Tested the patch, applies to trunk and tests pass.

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
-+-
   Reporter:  danbrwn|  Owner:  mitsuhiko
   Type:  Bug| Status:  new
  Milestone: |  Component:  Database layer
Version:  1.3|  (models, ORM)
 Resolution: |   Severity:  Normal
   Triage Stage:  Accepted   |   Keywords:
Needs documentation:  0  |  foreign,key,quoted,dceu2011
Patch needs improvement:  0  |  Has patch:  1
  UI/UX:  0  |Needs tests:  0
 |  Easy pickings:  0
-+-
Changes (by ojii):

 * keywords:  foreign,key,quoted => foreign,key,quoted,dceu2011
 * has_patch:  0 => 1
 * ui_ux:   => 0
 * easy:  1 => 0


Comment:

 Fixed this by raising a more useful exception, see patch. Discussed this
 with Alex and Andrew and they agreed that this is a reasonable solution
 for this.

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
-+-
   Reporter:  danbrwn|  Owner:  mitsuhiko
   Type:  Bug| Status:  new
  Milestone: |  Component:  Database layer
Version:  1.3|  (models, ORM)
 Resolution: |   Severity:  Normal
   Triage Stage:  Accepted   |   Keywords:  foreign,key,quoted
Needs documentation:  0  |  Has patch:  0
Patch needs improvement:  0  |Needs tests:  0
 |  Easy pickings:  1
-+-
Changes (by michaelvantellingen@…):

 * cc: michaelvantellingen@… (added)
 * easy:  0 => 1


Comment:

 Sorry, i meant to add myself as cc as I just encountered this issue on
 django 1.3

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
-+-
   Reporter:  danbrwn|  Owner:  mitsuhiko
   Type:  Bug| Status:  new
  Milestone: |  Component:  Database layer
Version:  1.3|  (models, ORM)
 Resolution: |   Severity:  Normal
   Triage Stage:  Accepted   |   Keywords:  foreign,key,quoted
Needs documentation:  0  |  Has patch:  0
Patch needs improvement:  0  |Needs tests:  0
 |  Easy pickings:  0
-+-
Changes (by anonymous):

 * easy:   => 0


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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
-+-
   Reporter:  danbrwn|Owner:  mitsuhiko
   Type:  Bug|   Status:  new
  Milestone: |Component:  Database layer
Version:  1.3|  (models, ORM)
 Resolution: | Severity:  Normal
   Triage Stage:  Accepted   | Keywords:  foreign,key,quoted
Needs documentation:  0  |Has patch:  0
Patch needs improvement:  0  |  Needs tests:  0
-+-
Changes (by camilonova):

 * version:  1.2 => 1.3


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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
-+-
   Reporter:  danbrwn|Owner:  mitsuhiko
   Type:  Bug|   Status:  new
  Milestone: |Component:  Database layer
Version:  1.2|  (models, ORM)
 Resolution: | Severity:  Normal
   Triage Stage:  Accepted   | Keywords:  foreign,key,quoted
Needs documentation:  0  |Has patch:  0
Patch needs improvement:  0  |  Needs tests:  0
-+-

Comment (by tehfink ):

 Interestingly, I've noticed this AttributeError is not raised if the
 quoted class name passed to the ForeignKey is 'auth.User'…perhaps because
 'django.contrib.auth' is usually the first installed app in
 INSTALLED_APPS?

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
-+-
   Reporter:  danbrwn|Owner:  mitsuhiko
   Type:  Bug|   Status:  new
  Milestone: |Component:  Database layer
Version:  1.2|  (models, ORM)
 Resolution: | Severity:  Normal
   Triage Stage:  Accepted   | Keywords:  foreign,key,quoted
Needs documentation:  0  |Has patch:  0
Patch needs improvement:  0  |  Needs tests:  0
-+-
Changes (by tehfink ):

 * cc: djsnickles@… (added)


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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
-+-
   Reporter:  danbrwn|Owner:  mitsuhiko
   Type:  Bug|   Status:  new
  Milestone: |Component:  Database layer
Version:  1.2|  (models, ORM)
 Resolution: | Severity:  Normal
   Triage Stage:  Accepted   | Keywords:  foreign,key,quoted
Needs documentation:  0  |Has patch:  0
Patch needs improvement:  0  |  Needs tests:  0
-+-
Changes (by SmileyChris):

 * type:   => Bug
 * severity:   => Normal


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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
---+
  Reporter:  danbrwn   | Owner:  mitsuhiko  
   
Status:  new   | Milestone: 
   
 Component:  Database layer (models, ORM)  |   Version:  1.2
   
Resolution:|  Keywords:  
foreign,key,quoted
 Stage:  Accepted  | Has_patch:  0  
   
Needs_docs:  0 |   Needs_tests:  0  
   
Needs_better_patch:  0 |  
---+
Changes (by eduardocereto):

 * cc: eduardocer...@gmail.com (added)

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
---+
  Reporter:  danbrwn   | Owner:  mitsuhiko  
   
Status:  new   | Milestone: 
   
 Component:  Database layer (models, ORM)  |   Version:  1.2
   
Resolution:|  Keywords:  
foreign,key,quoted
 Stage:  Accepted  | Has_patch:  0  
   
Needs_docs:  0 |   Needs_tests:  0  
   
Needs_better_patch:  0 |  
---+
Comment (by stormlifter):

 I was able to fix my error by removing a ForeignKey reference in the model
 that was being used in the ModelForm from the ModelForm using "exclude" in
 the Meta.

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
---+
  Reporter:  danbrwn   | Owner:  mitsuhiko  
   
Status:  new   | Milestone: 
   
 Component:  Database layer (models, ORM)  |   Version:  1.2
   
Resolution:|  Keywords:  
foreign,key,quoted
 Stage:  Accepted  | Has_patch:  0  
   
Needs_docs:  0 |   Needs_tests:  0  
   
Needs_better_patch:  0 |  
---+
Changes (by bernhard):

  * version:  1.1 => 1.2

Comment:

 I experience the same problem when trying to create a ModelFrom for an
 abstract Model, having a ForeignKey('self')!

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
---+
  Reporter:  danbrwn   | Owner:  mitsuhiko  
   
Status:  new   | Milestone: 
   
 Component:  Database layer (models, ORM)  |   Version:  1.1
   
Resolution:|  Keywords:  
foreign,key,quoted
 Stage:  Accepted  | Has_patch:  0  
   
Needs_docs:  0 |   Needs_tests:  0  
   
Needs_better_patch:  0 |  
---+
Comment (by camilonova):

 I just realize that this error doesnt happen when i use a file named
 ''admin.py''. This file contains all the admin related, extracting it from
 ''models.py'' you should check if this solves all kinds of problems
 related to this ticket. There's no need to make any changes to ''urls.py''
 as well, just using the admin.py file works great for me.

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
---+
  Reporter:  danbrwn   | Owner:  mitsuhiko  
   
Status:  new   | Milestone: 
   
 Component:  Database layer (models, ORM)  |   Version:  1.1
   
Resolution:|  Keywords:  
foreign,key,quoted
 Stage:  Accepted  | Has_patch:  0  
   
Needs_docs:  0 |   Needs_tests:  0  
   
Needs_better_patch:  0 |  
---+
Changes (by kmtracey):

  * milestone:  1.2 =>

Comment:

 Given we still don't have any better fix than "don't do that", this isn't
 going to make 1.2.

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
---+
  Reporter:  danbrwn   | Owner:  mitsuhiko  
   
Status:  new   | Milestone:  1.2
   
 Component:  Database layer (models, ORM)  |   Version:  1.1
   
Resolution:|  Keywords:  
foreign,key,quoted
 Stage:  Accepted  | Has_patch:  0  
   
Needs_docs:  0 |   Needs_tests:  0  
   
Needs_better_patch:  0 |  
---+
Changes (by anonymous):

 * cc: t...@aratyn.name (added)

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
---+
  Reporter:  danbrwn   | Owner:  mitsuhiko  
   
Status:  new   | Milestone:  1.2
   
 Component:  Database layer (models, ORM)  |   Version:  1.1
   
Resolution:|  Keywords:  
foreign,key,quoted
 Stage:  Accepted  | Has_patch:  0  
   
Needs_docs:  0 |   Needs_tests:  0  
   
Needs_better_patch:  0 |  
---+
Changes (by anonymous):

 * cc: subs...@gmail.com (added)

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
---+
  Reporter:  danbrwn   | Owner:  mitsuhiko  
   
Status:  new   | Milestone:  1.2
   
 Component:  Database layer (models, ORM)  |   Version:  1.1
   
Resolution:|  Keywords:  
foreign,key,quoted
 Stage:  Accepted  | Has_patch:  0  
   
Needs_docs:  0 |   Needs_tests:  0  
   
Needs_better_patch:  0 |  
---+
Changes (by anonymous):

 * cc: james...@gmail.com (added)

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
---+
  Reporter:  danbrwn   | Owner:  mitsuhiko  
   
Status:  new   | Milestone:  1.2
   
 Component:  Database layer (models, ORM)  |   Version:  1.1
   
Resolution:|  Keywords:  
foreign,key,quoted
 Stage:  Accepted  | Has_patch:  0  
   
Needs_docs:  0 |   Needs_tests:  0  
   
Needs_better_patch:  0 |  
---+
Comment (by mitsuhiko):

 Replying to [comment:15 ikut...@gmail.com]:
 > In 1.1 version,  I still got the same error after I follow the solution
 http://code.djangoproject.com/ticket/10405#comment:11
 That solution is a no-solution.  The problem is a technical limitation of
 the Django/Python combination and very hard to fix.  The correct
 workaround is to change the dependencies between forms and classes that
 access happens after the model was finalized.

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
---+
  Reporter:  danbrwn   | Owner:  mitsuhiko  
   
Status:  new   | Milestone:  1.2
   
 Component:  Database layer (models, ORM)  |   Version:  1.1
   
Resolution:|  Keywords:  
foreign,key,quoted
 Stage:  Accepted  | Has_patch:  0  
   
Needs_docs:  0 |   Needs_tests:  0  
   
Needs_better_patch:  0 |  
---+
Changes (by ikut...@gmail.com):

  * version:  1.0-alpha-2 => 1.1

Comment:

 In 1.1 version,  I still got the same error after I follow the solution
 http://code.djangoproject.com/ticket/10405#comment:11

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
---+
  Reporter:  danbrwn   | Owner:  mitsuhiko  
   
Status:  new   | Milestone:  1.2
   
 Component:  Database layer (models, ORM)  |   Version:  
1.0-alpha-2   
Resolution:|  Keywords:  
foreign,key,quoted
 Stage:  Accepted  | Has_patch:  0  
   
Needs_docs:  0 |   Needs_tests:  0  
   
Needs_better_patch:  0 |  
---+
Comment (by camilonova):

 For me this solves the error
 http://code.djangoproject.com/ticket/10405#comment:11

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
---+
  Reporter:  danbrwn   | Owner:  mitsuhiko  
   
Status:  new   | Milestone:  1.2
   
 Component:  Database layer (models, ORM)  |   Version:  
1.0-alpha-2   
Resolution:|  Keywords:  
foreign,key,quoted
 Stage:  Accepted  | Has_patch:  0  
   
Needs_docs:  0 |   Needs_tests:  0  
   
Needs_better_patch:  0 |  
---+
Comment (by kmtracey):

 #11143 reported this again.

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
---+
  Reporter:  danbrwn   | Owner:  mitsuhiko  
   
Status:  new   | Milestone:  1.2
   
 Component:  Database layer (models, ORM)  |   Version:  
1.0-alpha-2   
Resolution:|  Keywords:  
foreign,key,quoted
 Stage:  Accepted  | Has_patch:  0  
   
Needs_docs:  0 |   Needs_tests:  0  
   
Needs_better_patch:  0 |  
---+
Comment (by mkibbel):

 In {{{admin.autodiscover()}}}, the {{{AttributeError}}} is occurring when
 a model form class is being created when Django translates
 {{{django.forms}}} field objects for each of the {{{django.db.models}}}
 field objects defined in the model (see the
 {{{django.forms.models.ModelFormMetaclass.__new__()}}} function). This
 process ends up calling each model field's {{{formfield()}}} method to
 perform the translation.

 The {{{formfield()}}} implementation in {{{ForeignKey}}},
 {{{OneToOneField}}} and {{{ManyToManyField}}} each refer to
 {{{self.rel.to}}}. Until all of the models are completely loaded and lazy
 model references are resolved, {{{self.rel.to}}} may still be a string and
 not a model class. The change from a string to a model class object
 happens in a lazy callback set up in
 {{{django.db.models.fields.related.RelatedField.contribute_to_class()}}}:

 {{{
 other = self.rel.to # NOTE: still a string for lazy model references
 if isinstance(other, basestring):
 def resolve_related_class(field, model, cls):
 field.rel.to = model
 field.do_related_class(model, cls)
 add_lazy_relation(cls, self, other, resolve_related_class)
 else:
 self.do_related_class(other, cls)
 }}}

 See the definition of {{{add_lazy_relation()}}} and
 {{{do_pending_lookups()}}}, the {{{signals.class_prepared handler}}}, in
 this module for more details.

 You have to prevent a field's {{{self.rel.to}}} attribute from being used
 until after lazy model resolution for its model is complete. By using the
 model cache API defined in {{{django.db.models.loading}}}, you can
 guarantee that all models are loaded before {{{admin.autodiscover()}}}
 loads and registers the admin classes.

 One simple change to {{{admin.autodiscover()}}} could resolve this
 problem, but I'm not sure what other implications it would have.
 {{{autodiscover()}}} searches for admin.py modules by importing each
 application module defined in {{{settings.INSTALLED_APPS}}} and checking
 if an admin module exists. This code could use the model caching API
 instead to retrieve the application modules, so we'd be replacing:

 {{{
 for app in settings.INSTALLED_APPS:
 # process apps (strings)
 }}}

 with:

 {{{
 for app in model_cache.get_apps():
 # process apps (module objects)
 }}}

 {{{get_apps()}}} loads all models before returning, so we can be sure that
 all the models are ready before any of the admin imports happen. The admin
 class creation process will load all the model classes, so I don't think
 it would hurt performance to pre-load them. It is possible that this
 change would cause other unexpected side effects in some projects.

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
---+
  Reporter:  danbrwn   | Owner:  mitsuhiko  
   
Status:  new   | Milestone:  1.2
   
 Component:  Database layer (models, ORM)  |   Version:  
1.0-alpha-2   
Resolution:|  Keywords:  
foreign,key,quoted
 Stage:  Accepted  | Has_patch:  0  
   
Needs_docs:  0 |   Needs_tests:  0  
   
Needs_better_patch:  0 |  
---+
Comment (by mkibbel):

 I've been having a similar problem recently with one of my projects. The
 AttributeError gets raised inside the call to admin.autodiscover() in my
 urls.py, similar to bugs described in #8569. Due to model
 interdependencies, I have to to use lazy model referencing with quoted
 strings for some of the FK and M2M relationships in my project.

 I never ran into this AttributeError until I turned DEBUG off. After
 reading through these tickets and pouring through some of the Django
 source code, I came up with a simple workaround for my particular problem.
 Just add this to urls.py before calling admin.autodiscover():

 {{{
 from django.db.models.loading import cache as model_cache
 if not model_cache.loaded:
 model_cache.get_models()
 }}}

 My reasoning for this is explained briefly in the next comment.

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
---+
  Reporter:  danbrwn   | Owner:  mitsuhiko  
   
Status:  new   | Milestone:  1.2
   
 Component:  Database layer (models, ORM)  |   Version:  
1.0-alpha-2   
Resolution:|  Keywords:  
foreign,key,quoted
 Stage:  Accepted  | Has_patch:  0  
   
Needs_docs:  0 |   Needs_tests:  0  
   
Needs_better_patch:  0 |  
---+
Changes (by jacob):

  * milestone:  1.1 => 1.2

Comment:

 The good news is that there's an easy workaround, so we can punt this to
 the 1.2 release. For now, just make sure you define ModelForms after
 Models.

 The bad news is that this is going to be very hard to fix.

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
---+
  Reporter:  danbrwn   | Owner:  mitsuhiko  
   
Status:  new   | Milestone:  1.1
   
 Component:  Database layer (models, ORM)  |   Version:  
1.0-alpha-2   
Resolution:|  Keywords:  
foreign,key,quoted
 Stage:  Accepted  | Has_patch:  0  
   
Needs_docs:  0 |   Needs_tests:  0  
   
Needs_better_patch:  0 |  
---+
Changes (by mitsuhiko):

  * owner:  nobody => mitsuhiko

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
---+
  Reporter:  danbrwn   | Owner:  nobody 
   
Status:  new   | Milestone:  1.1
   
 Component:  Database layer (models, ORM)  |   Version:  
1.0-alpha-2   
Resolution:|  Keywords:  
foreign,key,quoted
 Stage:  Accepted  | Has_patch:  0  
   
Needs_docs:  0 |   Needs_tests:  0  
   
Needs_better_patch:  0 |  
---+
Comment (by GDorn):

 Confirming that happens to me as well in the 1.1 beta 1, freshly
 installed.  I also can show an identical case (except for declaration
 order) which doesn't cause the problem.

 This arrangement causes the {{{AttributeError}}}:
 {{{
 class ClassA(models.Model):
 ref = models.ForeignKey("ClassB")

 class ClassAForm(ModelForm):
 class Meta:
 model=ClassA

 class ClassB(models.Model):
 pass
 }}}


 This arrangement does not:
 {{{
 class ClassA(models.Model):
 ref = models.ForeignKey("ClassB")

 class ClassB(models.Model):
 pass

 class ClassAForm(ModelForm):
 class Meta:
 model=ClassA
 }}}

 Hope this helps.

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
---+
  Reporter:  danbrwn   | Owner:  nobody 
   
Status:  new   | Milestone:  1.1
   
 Component:  Database layer (models, ORM)  |   Version:  
1.0-alpha-2   
Resolution:|  Keywords:  
foreign,key,quoted
 Stage:  Accepted  | Has_patch:  0  
   
Needs_docs:  0 |   Needs_tests:  0  
   
Needs_better_patch:  0 |  
---+
Changes (by jacob):

  * component:  Uncategorized => Database layer (models, ORM)

-- 
Ticket URL: 
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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
+---
  Reporter:  danbrwn| Owner:  nobody
Status:  new| Milestone:  1.1   
 Component:  Uncategorized  |   Version:  1.0-alpha-2   
Resolution: |  Keywords:  foreign,key,quoted
 Stage:  Accepted   | Has_patch:  0 
Needs_docs:  0  |   Needs_tests:  0 
Needs_better_patch:  0  |  
+---
Changes (by ramiro):

 * cc: ramiro (added)

-- 
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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
+---
  Reporter:  danbrwn| Owner:  nobody
Status:  new| Milestone:  1.1   
 Component:  Uncategorized  |   Version:  1.0-alpha-2   
Resolution: |  Keywords:  foreign,key,quoted
 Stage:  Accepted   | Has_patch:  0 
Needs_docs:  0  |   Needs_tests:  0 
Needs_better_patch:  0  |  
+---
Comment (by ramiro):

 I have been able to reproduce this with Django trunk r9984 + mod_python +
 Apache with this minimal setup:

 A t10405 app:

 {{{
 #!python
 # models.py
 from django.db import models
 from django.forms import ModelForm

 class Extension(models.Model):
 context=models.ForeignKey('app2.station')

 class ExtensionForm(ModelForm):
 class Meta:
 model = Extension
 }}}

 {{{
 #!python
 # admin.py
 from t10405.models import Extension
 from django.contrib import admin

 admin.site.register(Extension)
 }}}

 The 'app2' application has only a models.py file:

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

 class station(models.Model):
 name = models.CharField(max_length=10)
 }}}

 urls.py has only the admin app activated (no app URLs).

 Bug shows itself when accessing the main admin page and shows as a pure
 text traceback when `DEBUG= False`.

 Note how t10405's `admin.py` imports models.py and this one contains a
 !ModelForm -derived class (this is also visible in the OP's traceback).
 Key thing here for the bug appearing is the !ExtensionForm's `Meta` inner-
 class definition because replacing the !ExtensionForm body with `pass` or
 completely commenting out !ExtensionForm so only the !ModelForm import is
 left makes the bug disappear.

 The traceback:

 {{{
 Mod_python error: "PythonHandler django.core.handlers.modpython"

 Traceback (most recent call last):

   File "/usr/lib/python2.4/site-packages/mod_python/apache.py", line 299,
 in HandlerDispatch
 result = object(req)

   File "/home/ramiro/src/django/trunk/django/core/handlers/modpython.py",
 line 228, in handler
 return ModPythonHandler()(req)

   File "/home/ramiro/src/django/trunk/django/core/handlers/modpython.py",
 line 201, in __call__
 response = self.get_response(request)

   File "/home/ramiro/src/django/trunk/django/core/handlers/base.py", line
 128, in get_response
 return self.handle_uncaught_exception(request, resolver, exc_info)

   File "/home/ramiro/src/django/trunk/django/core/handlers/base.py", line
 159, in handle_uncaught_exception
 callback, param_dict = resolver.resolve500()

   File "/home/ramiro/src/django/trunk/django/core/urlresolvers.py", line
 226, in resolve500
 return self._resolve_special('500')

   File "/home/ramiro/src/django/trunk/django/core/urlresolvers.py", line
 215, in _resolve_special
 callback = getattr(self.urlconf_module, 'handler%s' % view_type)

   File "/home/ramiro/src/django/trunk/django/core/urlresolvers.py", line
 200, in _get_urlconf_module
 self._urlconf_module = __import__(self.urlconf_name, {}, {}, [''])

   File "/web/djapps/dtests/urls.py", line 2, in ?
 from t10405.models import Extension

   File "/web/djapps/dtests/t10405/models.py", line 7, in ?
 class ExtensionForm(ModelForm):

   File "/home/ramiro/src/django/trunk/django/forms/models.py", line 195,
 in __new__
 opts.exclude, formfield_callback)

   File "/home/ramiro/src/django/trunk/django/forms/models.py", line 162,
 in fields_for_model
 formfield = formfield_callback(f)

   File "/home/ramiro/src/django/trunk/django/forms/models.py", line 177,
 in
 lambda f: f.formfield())

   File "/home/ramiro/src/django/trunk/django/db/models/fields/related.py",
 line 700, in formfield
 defaults = {

 AttributeError: 'str' object has no attribute '_default_manager'
 }}}

 It's worth noting that the other user reporting this on django-users
 (http://groups.google.com/group/django-
 users/browse_frm/thread/ae22023a61290c1e) also defined a !ModelForm
 subclass but in an admin.py file.

 Trying to execute `syncdb` also shows the bug (even with `DEBUG = False`)
 but with a different code path:

 {{{
 $ python manage.py syncdb
 Traceback (most recent call last):
   File "manage.py", line 11, in ?
 execute_manager(settings)
   File "/home/ramiro/src/django/trunk/django/core/management/__init__.py",
 line 350, in execute_manager
 utility.execute()
   File "/home/ramiro/src/django/trunk/django/core/management/__init__.py",
 line 295, in execute
 self.fetch_command(subcommand).run_from_argv(self.argv)
   File "/home/ramiro/src/django/trunk/django/core/management/base.py",
 line 195, in run_from_argv
 self.execut

Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
+---
  Reporter:  danbrwn| Owner:  nobody
Status:  new| Milestone:  1.1   
 Component:  Uncategorized  |   Version:  1.0-alpha-2   
Resolution: |  Keywords:  foreign,key,quoted
 Stage:  Accepted   | Has_patch:  0 
Needs_docs:  0  |   Needs_tests:  0 
Needs_better_patch:  0  |  
+---
Changes (by jacob):

  * stage:  Unreviewed => Accepted
  * milestone:  => 1.1

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
+---
  Reporter:  danbrwn| Owner:  nobody
Status:  new| Milestone:
 Component:  Uncategorized  |   Version:  1.0-alpha-2   
Resolution: |  Keywords:  foreign,key,quoted
 Stage:  Unreviewed | Has_patch:  0 
Needs_docs:  0  |   Needs_tests:  0 
Needs_better_patch:  0  |  
+---
Comment (by kmtracey):

 Replying to [comment:1 Alex]:
 > Pleas use the preview button.  Further this is tested quite extensively:
 
http://code.djangoproject.com/browser/django/trunk/tests/regressiontests/string_lookup/models.py
 so if no more details can be provided I'm going to mark worksforme.

 Notice two people have reported this recently on django-users, both (I
 believe) mentioned they saw the problem only under mod_python/Apache, and
 not the development server, so there is something different about non-dev-
 server environment.  I'm not sure the test environment can be used to
 completely mimic what's happening under Apache here.  I could wish for a
 more minimal failing example, but before closing worksforme I think
 something like this needs to be tested under mod_python (or mod_wsgi), not
 just under dev server.  I myself won't be able to do that for a few days
 yet, as I'm away from home and my test machines.  If someone else does do
 that please post the minimal (failing or working) example of FK reference
 using quoted strings.

 Replying to [comment:2 ramiro]:
 > See also #8569

 One of the posters who ran into this on the user's list did find that
 ticket also.  The fix for that went in before 1.0 so I believe both
 posters already have it.  That fix happens to only be relevant when DEBUG
 is set to True: the traceback there was from the admin validation routine
 which is only called when DEBUG is on, and the fix that went in also
 applies only when DEBUG is on.  At least one of the posters who ran into
 this recently specifically noted it only happened with DEBUG=False, and
 under Apache, not the dev server.

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
+---
  Reporter:  danbrwn| Owner:  nobody
Status:  new| Milestone:
 Component:  Uncategorized  |   Version:  1.0-alpha-2   
Resolution: |  Keywords:  foreign,key,quoted
 Stage:  Unreviewed | Has_patch:  0 
Needs_docs:  0  |   Needs_tests:  0 
Needs_better_patch:  0  |  
+---
Comment (by ramiro):

 See also #8569

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Re: [Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
+---
  Reporter:  danbrwn| Owner:  nobody
Status:  new| Milestone:
 Component:  Uncategorized  |   Version:  1.0-alpha-2   
Resolution: |  Keywords:  foreign,key,quoted
 Stage:  Unreviewed | Has_patch:  0 
Needs_docs:  0  |   Needs_tests:  0 
Needs_better_patch:  0  |  
+---
Changes (by Alex):

  * needs_better_patch:  => 0
  * needs_tests:  => 0
  * needs_docs:  => 0

Old description:

> Myself and another discovered the following error with the code shown. In
> both cases we had quoted strings for reference class. In both cases
> importing the specific class and then referencing without the quotes
> solved the problem. I tried through IRC channel to get a resolution.
> Downloaded code, wiped out site-packages/django dir before running setup,
> took other suggestions. Nothing worked except removing the quotes as
> suggested on the django-users group. I am running Debian Etch final.
> Python 2.5 and Django 1.0.2, Apache2 with mod_python
> AttributeError: 'str' object has no attribute '_default_manager
> -- getting this error
> --
> MOD_PYTHON ERROR
>
> ProcessId:  2637
> Interpreter:'TS1.unassigned-domain'
>
> ServerName: 'TS1.unassigned-domain'
> DocumentRoot:   '/var/www/'
>
> URI:'/sipprovision/admin'
> Location:   '/sipprovision/'
> Directory:  None
> Filename:   '/var/www/sipprovision/admin'
> PathInfo:   ''
>
> Phase:  'PythonHandler'
> Handler:'django.core.handlers.modpython'
>
> Traceback (most recent call last):
>
>   File "/usr/lib/python2.5/site-packages/mod_python/importer.py", line
> 1537, in HandlerDispatch
> default=default_handler, arg=req, silent=hlist.silent)
>
>   File "/usr/lib/python2.5/site-packages/mod_python/importer.py", line
> 1229, in _process_target
> result = _execute_target(config, req, object, arg)
>
>   File "/usr/lib/python2.5/site-packages/mod_python/importer.py", line
> 1128, in _execute_target
> result = object(arg)
>
>   File "/usr/lib/python2.5/site-
> packages/django/core/handlers/modpython.py", line 228, in handler
> return ModPythonHandler()(req)
>
>   File "/usr/lib/python2.5/site-
> packages/django/core/handlers/modpython.py", line 201, in __call__
> response = self.get_response(request)
>
>   File "/usr/lib/python2.5/site-packages/django/core/handlers/base.py",
> line 67, in get_response
> response = middleware_method(request)
>
>   File "/usr/lib/python2.5/site-packages/django/middleware/common.py",
> line 56, in process_request
> if (not _is_valid_path(request.path_info) and
>
>   File "/usr/lib/python2.5/site-packages/django/middleware/common.py",
> line 142, in _is_valid_path
> urlresolvers.resolve(path)
>
>   File "/usr/lib/python2.5/site-packages/django/core/urlresolvers.py",
> line 246, in resolve
> return get_resolver(urlconf).resolve(path)
>
>   File "/usr/lib/python2.5/site-packages/django/core/urlresolvers.py",
> line 179, in resolve
> for pattern in self.urlconf_module.urlpatterns:
>
>   File "/usr/lib/python2.5/site-packages/django/core/urlresolvers.py",
> line 198, in _get_urlconf_module
> self._urlconf_module = __import__(self.urlconf_name, {}, {}, [''])
>
>   File "/var/www/sipprovision/urls.py", line 2, in 
> from extensions.models import Extension
>
>   File "/var/www/sipprovision/extensions/models.py", line 42, in 
> class ExtensionForm(ModelForm):
>
>   File "/usr/lib/python2.5/site-packages/django/forms/models.py", line
> 195, in __new__
> opts.exclude, formfield_callback)
>
>   File "/usr/lib/python2.5/site-packages/django/forms/models.py", line
> 162, in fields_for_model
> formfield = formfield_callback(f)
>
>   File "/usr/lib/python2.5/site-packages/django/forms/models.py", line
> 177, in 
> lambda f: f.formfield())
>
>   File "/usr/lib/python2.5/site-
> packages/django/db/models/fields/related.py", line 694, in formfield
> 'queryset': self.rel.to._default_manager.complex_filter(
>
> AttributeError: 'str' object has no attribute '_default_manager'
>

> - with this model
> -
> from django.db import models
> from sipconfig import *
> from django.forms import ModelForm, fields, TextInput, IntegerField
> # Create your models here.
> class Plc(models.Model):
> name=models.CharField(max_length=30)
> ip_addr=models.IPAddressField()
> ip_port=models.IntegerField(default=9600)
> plc_net=models.IntegerField()
> plc_node=models.IntegerFiel

[Django] #10405: quoted class names in foreign key definition causes 'str' object has no attribute '_default_manager'

[Django]

#10405: quoted class names in foreign key definition causes 'str' object has no
attribute '_default_manager'
+---
 Reporter:  danbrwn |   Owner:  nobody 
   Status:  new |   Milestone: 
Component:  Uncategorized   | Version:  1.0-alpha-2
 Keywords:  foreign,key,quoted  |   Stage:  Unreviewed 
Has_patch:  0   |  
+---
 Myself and another discovered the following error with the code shown. In
 both cases we had quoted strings for reference class. In both cases
 importing the specific class and then referencing without the quotes
 solved the problem. I tried through IRC channel to get a resolution.
 Downloaded code, wiped out site-packages/django dir before running setup,
 took other suggestions. Nothing worked except removing the quotes as
 suggested on the django-users group. I am running Debian Etch final.
 Python 2.5 and Django 1.0.2, Apache2 with mod_python
 AttributeError: 'str' object has no attribute '_default_manager
 -- getting this error
 --
 MOD_PYTHON ERROR

 ProcessId:  2637
 Interpreter:'TS1.unassigned-domain'

 ServerName: 'TS1.unassigned-domain'
 DocumentRoot:   '/var/www/'

 URI:'/sipprovision/admin'
 Location:   '/sipprovision/'
 Directory:  None
 Filename:   '/var/www/sipprovision/admin'
 PathInfo:   ''

 Phase:  'PythonHandler'
 Handler:'django.core.handlers.modpython'

 Traceback (most recent call last):

   File "/usr/lib/python2.5/site-packages/mod_python/importer.py", line
 1537, in HandlerDispatch
 default=default_handler, arg=req, silent=hlist.silent)

   File "/usr/lib/python2.5/site-packages/mod_python/importer.py", line
 1229, in _process_target
 result = _execute_target(config, req, object, arg)

   File "/usr/lib/python2.5/site-packages/mod_python/importer.py", line
 1128, in _execute_target
 result = object(arg)

   File "/usr/lib/python2.5/site-
 packages/django/core/handlers/modpython.py", line 228, in handler
 return ModPythonHandler()(req)

   File "/usr/lib/python2.5/site-
 packages/django/core/handlers/modpython.py", line 201, in __call__
 response = self.get_response(request)

   File "/usr/lib/python2.5/site-packages/django/core/handlers/base.py",
 line 67, in get_response
 response = middleware_method(request)

   File "/usr/lib/python2.5/site-packages/django/middleware/common.py",
 line 56, in process_request
 if (not _is_valid_path(request.path_info) and

   File "/usr/lib/python2.5/site-packages/django/middleware/common.py",
 line 142, in _is_valid_path
 urlresolvers.resolve(path)

   File "/usr/lib/python2.5/site-packages/django/core/urlresolvers.py",
 line 246, in resolve
 return get_resolver(urlconf).resolve(path)

   File "/usr/lib/python2.5/site-packages/django/core/urlresolvers.py",
 line 179, in resolve
 for pattern in self.urlconf_module.urlpatterns:

   File "/usr/lib/python2.5/site-packages/django/core/urlresolvers.py",
 line 198, in _get_urlconf_module
 self._urlconf_module = __import__(self.urlconf_name, {}, {}, [''])

   File "/var/www/sipprovision/urls.py", line 2, in 
 from extensions.models import Extension

   File "/var/www/sipprovision/extensions/models.py", line 42, in 
 class ExtensionForm(ModelForm):

   File "/usr/lib/python2.5/site-packages/django/forms/models.py", line
 195, in __new__
 opts.exclude, formfield_callback)

   File "/usr/lib/python2.5/site-packages/django/forms/models.py", line
 162, in fields_for_model
 formfield = formfield_callback(f)

   File "/usr/lib/python2.5/site-packages/django/forms/models.py", line
 177, in 
 lambda f: f.formfield())

   File "/usr/lib/python2.5/site-
 packages/django/db/models/fields/related.py", line 694, in formfield
 'queryset': self.rel.to._default_manager.complex_filter(

 AttributeError: 'str' object has no attribute '_default_manager'


 - with this model
 -
 from django.db import models
 from sipconfig import *
 from django.forms import ModelForm, fields, TextInput, IntegerField
 # Create your models here.
 class Plc(models.Model):
 name=models.CharField(max_length=30)
 ip_addr=models.IPAddressField()
 ip_port=models.IntegerField(default=9600)
 plc_net=models.IntegerField()
 plc_node=models.IntegerField()
 plc_unit=models.IntegerField()

 def __unicode__(self):
   return self.name

 class Admin: pass

 class VoipGateway(models.Model):
 name=models.OneToOneField('sipconfig.station')
 def __unicode__(self):
   return self.name.dev_name
 class Admin: pass

 class Extension(models.Model):
 PREFIX_CHOICE=(
 ('1','station'),
 ('9','lock'),
 ('8','voicemail'))