Hello Karen,
Here is a minimal example of what I am trying to do. I am trying to
have a save/load functionality before a user posts their information.
This gives me an UnresolvableValidationError because the id of the
model is undefined when I call is_valid(). I tried a workaround by
doing: def full_validation(): pass in my model, but now the modelform
is not saving the data to the form (although all the cleaned_data is
there).
class Foo(models.Model):
creator = models.ForeignKey(User)
created = models.DateTimeField('date created')
title = models.CharField( max_length=80 )
class FooForm(forms.ModelForm):
class Meta:
model = Foo
fields = ('title',)
def save(request):
"""Called when a submit button is clicked, not used for GET
requests."""
def bind_instance(fooform, foo_pk):
try:
db_foo = Foo.objects.get(pk=foo_pk)
fooform.just_created = False
except Foo.DoesNotExist:
db_foo = Foo()
fooform.just_created = True
fooform.instance = db_foo
return fooform
if request.method == "GET":
return ERROR_CONDITION
myform = FooForm( request.POST )
if myform.is_valid():
primary_key = request.session['editing_foo'] # -1 if new,
else returns the key of the foo being edited
fooform = bind_instance(fooform, primary_key)
foo = fooform.save(commit=False)
# Title should be handled by modelform
if fooform.just_created:
foo.creator = request.user
foo.created = datetime.datetime.now()
foo.save()
return render_to_response( 'success.html', {},
context_instance=RequestContext(request) )
else:
return render_to_reponse( 'sometemplate.html', { 'form' :
myform }, context_instance=RequestContext(request) )
Thanks!
A.M.
On Jan 5, 9:02 pm, Karen Tracey <[email protected]> wrote:
> On Tue, Jan 5, 2010 at 8:41 PM, Aristotle Miternan
> <[email protected]>wrote:
>
> > Oops, taking a second look, I think you are right, the object I was
> > using to test that had its __unicode__ method calling something that
> > shouldn't exist yet. I guess this example was not complex enough.
>
> > However, I think that I have figured out the problem. Model validation
> > was introduced in the latest patch, but I don't really understand how
> > it is different from what was before (not much explanation in the
> > docs). However, it seems that in ModelForms, clean() calls
> > self.instance.full_validate(). The problem with this is that I don't
> > necessarily have a >saved< instance assigned to the model yet. I don't
> > have enough data to save it before the form is evaluated! It seems
> > that I can work around this behavior by writing an overloaded
> > full_validate on my model, but this sounds flakey to me. Any thoughts?
>
> It would really help if you could show a minimal example of code that
> demonstrates the problem.
>
> Karen
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