CODEWITHSUNDEEP
djangodjango-modelsdjango-forms
David
David

Reputation: 699

How to pass data to clean method in Django

I am struggeling with passing an "external" parameter to my custom clean method.

Except of the identifier, I pass everything using the form. The identifier comes from the URL. I need to use the identifier in addition to the form stuff.

Here is my code:

class Entry(models.Model):
    identifier = models.ForeignKey(Offer)
    name = models.CharField(max_length=64)
    description = models.TextField()


class EntryForm(ModelForm):
    class Meta:
        model = Entry

    def clean(self):
        try:
            Entry.objects.get(
                identifier=THIS IS WHAT I NEED TO FILL,
                description=self.cleaned_data['description'],
                name=self.cleaned_data['name'])
        raise forms.ValidationError(_(u'We already have an entry with the same credentials!'))
    except Entry.DoesNotExist:
        pass
    return self.cleaned_data

VIEW:

def addEntry(request, identifier):

    entry = get_object_or_404(Entry, pk=identifier)

    if request.method == "POST":
        entryForm = EntryForm(data=request.POST)
        if entryForm.is_valid():
            entry = entryForm.save(commit=False)
            entry.identifier = identifier
            entry.save()
        else:
            entryForm = EntryForm(data=request.POST)
...

So I am missing the part where I can add the identifier to the clean method.

Thanks for the help in advanced!

Upvotes: 0

Views: 4637

Answers (1)

Daniel Roseman
Daniel Roseman

Reputation: 599610

You need to pass it in from the view when you instantiate the form. The usual pattern is like this:

class EntryForm(ModelForm):
    def __init__(self, *args, **kwargs):
        self.identifier = kwargs.pop('identifier', None)
        super(EntryForm, self).__init__(*args, **kwargs)

    def clean(self):
        try:
            Entry.objects.get(
                identifier=self.identifier...

and in the view:

if request.method == "POST":
    entryForm = EntryForm(data=request.POST, identifier=identifier)

Upvotes: 11

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