#19271: Form validation throws AttributeError has "Base Model has no attribute
_default_manager"
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Reporter: | Owner: nobody
iamrohitbanga@… | Status: new
Type: Bug | Version: 1.4
Component: Forms | Keywords: forms, models, unique constrait
Severity: Normal | Has patch: 0
Triage Stage: Unreviewed | UI/UX: 0
Easy pickings: 0 |
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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
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Ticket URL: <https://code.djangoproject.com/ticket/19271>
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