Change boolean value in Django ModelForm

Question

I have field in my Model which indicates whether a user wants to receive emails

receive_invites = models.BooleanField(default=True, help_text="Receive an invite email from friends")

I also have a view with an option:

[ x ] I do not want to receive emails...

By default receive_invites is True therefore the checkbox is ticked. However, I'd like the user to tick the checkbox in order to change receive_invites to False. I did the following in my ModelForm to achieve this. Does anybody have a more elegant way of doing this?

class UnsubscribeForm(forms.ModelForm):        
    class Meta:
        model = Entrant
        fields = ('receive_invites')

    def __init__(self, *args, **kwargs):
        if kwargs.has_key('instance'):
            instance = kwargs['instance']
            if instance.receive_invites:
                instance.receive_invites = False
            else:
                instance.receive_invites = True
        super(UnsubscribeForm, self).__init__(*args, **kwargs)

and in the view I have this:

if request.method == 'POST':
    unsubscribe_form = UnsubscribeForm(request.POST, instance=me)

    if unsubscribe_form.is_valid():
        receive_invites = unsubscribe_form.cleaned_data['receive_invites']
        if receive_invites:
            user.receive_invites = False
        else:
            user.receive_invites = True
        unsubscribe_form.save()
        return redirect('index')
else:
    unsubscribe_form = UnsubscribeForm(instance=me)

Answer 1

Adding on to @DrTyrsa, it's unreasonable to go through so much convolution just to follow a field naming convention. If you're attached to that field name, you can always add a property to the model that maps the data field to a value you care about:

dont_receive_invites = models.BooleanField(default=False, help_text="Don't receive an invite email from friends")

@property
def receive_invites(self):
    return not self.dont_receive_invites

Answer 2

You can't alter the model? If you can, create dont_receive_invites field instead and save a lot of time.

Answer 3

Why not just remove the words "do not" from the view?

[ x ] I want to receive emails...

Otherwise, I'd recommend changing UnsubscribeForm from a ModelForm to a plain Form. Then you can invert booleans all you want without resorting to trickery. It's more work, but it'll work if you can't just change the label.