#28098: Error while doing migrations for a new model that is used in an form in
the
admin.py
----------------------------------+--------------------------------------
Reporter: GHARIANI Mohamed | Owner: nobody
Type: Bug | Status: closed
Component: Migrations | Version: 1.8
Severity: Normal | Resolution: invalid
Keywords: migrations | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Changes (by Ramiro Morales):
* status: new => closed
* resolution: => invalid
Comment:
Unfortunately your modelform makes no sense:
{{{
class AppForm(forms.ModelForm):
name = ((elem.id, elem.name ) for elem in App.objects.all())
}}}
If you've followed advice from someone or read that somewhere stop using
such help.
And if that's code you created by yourself then please read the modelform
documentation:
https://docs.djangoproject.com/en/1.8/topics/forms/modelforms/
Django modelforms (like other components ike models, etc.) are defined in
a **declarative** style.
It makes no sense trying to define something in a declarative way by
looping over a ORM queryset (DB query) like you are trying to do.
When you see a model or modelform definition think it's similar to an
object or data structure definition which when using a static, compiled
programming language (like C++, etc.) define its shape and behavior.
Then when your Django app is running, these definitions are used together
with your database and the information it contains. But this another
latter, stage (thing runtime of a program as opposed to the compile time
described above).
This is why doesn't make sense to use a DB query when defining the
modelform. You are trying to use data from the runtime stage at the
modelform declaration stage.
--
Ticket URL: <https://code.djangoproject.com/ticket/28098#comment:1>
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