#19271: Form validation throws AttributeError has "Base Model has no attribute
_default_manager"
-------------------------------------+-------------------------------------
Reporter: iamrohitbanga@… | Owner: nobody
Type: Bug | Status: new
Component: Forms | Version: 1.4
Severity: Normal | Resolution:
Keywords: forms, models, | Triage Stage:
unique constrait | Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Changes (by claudep):
* needs_docs: => 0
* needs_tests: => 0
* needs_better_patch: => 0
Old description:
> I have an abstract model BaseModel having a field with unique=True.
> BaseModel obviously has abstract=True.
> Now I create a MyModel which inherits from BaseModel.
>
> Now I have a view that tries to create a new entry in MyModel with data
> in post request.
>
> {{{
> #!div style="font-size: 80%"
> def add_new(request, id) {
> myModel = MyModel() # I am actually creating MyModel
> dynamically but that should not matter
> if request.method == 'POST':
> form = MyModelForm(request.POST)
> if form.is_valid():
> mymodel.field1 = form.cleaned_data['field1']
> mymodel.field2 = form.cleaned_data['field3']
> mymodel.save()
> return render_to_response("mytemplate.html", {'form' :
> form},
> RequestContext(request))
> else:
> pass # return some error here
> }
> }}}
>
> Now this code works fine when field1 does not have unique=True set but
> not when field1 has unique=True property set.
> When the unique property is set then the form.is_valid() fails. It gives
> an AttributeError. 'BaseModel' object has no attribute
> '_default_manager'.
>
> The moment I remove unique=True from my field it works perfectly fine.
> Just a caveat here. I am creating MyModel object dynamically creating the
> object by loading the class dynamically using the approach described
> here.
> http://stackoverflow.com/a/547867/161628
New description:
I have an abstract model BaseModel having a field with unique=True.
BaseModel obviously has abstract=True.
Now I create a MyModel which inherits from BaseModel.
Now I have a view that tries to create a new entry in MyModel with data in
post request.
{{{
def add_new(request, id) {
myModel = MyModel() # I am actually creating MyModel
dynamically but that should not matter
if request.method == 'POST':
form = MyModelForm(request.POST)
if form.is_valid():
mymodel.field1 = form.cleaned_data['field1']
mymodel.field2 = form.cleaned_data['field3']
mymodel.save()
return render_to_response("mytemplate.html", {'form' :
form},
RequestContext(request))
else:
pass # return some error here
}
}}}
Now this code works fine when field1 does not have unique=True set but not
when field1 has unique=True property set.
When the unique property is set then the form.is_valid() fails. It gives
an AttributeError. 'BaseModel' object has no attribute '_default_manager'.
The moment I remove unique=True from my field it works perfectly fine.
Just a caveat here. I am creating MyModel object dynamically creating the
object by loading the class dynamically using the approach described here.
http://stackoverflow.com/a/547867/161628
--
Comment:
Reformatted, please use preview before posting.
--
Ticket URL: <https://code.djangoproject.com/ticket/19271#comment:1>
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