sg101: polls/forms.py annotate

For #45, create admin action to unsubscribe users from topics.

rev	line source
gremmie@1	1 """Forms for the Polls application."""
gremmie@1	2
gremmie@1	3 from django import forms
bgneal@439	4 from django.db.models import F
gremmie@1	5
gremmie@1	6 from polls.models import Choice
gremmie@1	7
gremmie@1	8
gremmie@1	9 class VoteForm(forms.Form):
bgneal@439	10 """Form for voting in a poll."""
bgneal@439	11 choices = forms.ModelChoiceField(label='', empty_label=None,
bgneal@439	12 queryset=Choice.objects.none(), widget=forms.RadioSelect)
gremmie@1	13
bgneal@439	14 def __init__(self, poll, args, *kwargs):
bgneal@439	15 self.user = kwargs.pop('user', None)
bgneal@439	16 self.user_choice = kwargs.pop('user_choice', None)
bgneal@439	17 super(VoteForm, self).__init__(args, *kwargs)
bgneal@439	18 self.fields['choices'].queryset = poll.choice_set.all()
gremmie@1	19
bgneal@439	20 def clean(self):
bgneal@439	21 if self.user_choice:
bgneal@439	22 raise forms.ValidationError("You've already voted in this poll!")
bgneal@439	23 return self.cleaned_data
bgneal@439	24
bgneal@439	25 def save(self):
bgneal@439	26 choice = self.cleaned_data['choices']
bgneal@439	27 Choice.objects.filter(id=choice.id).update(votes=F('votes') + 1)
bgneal@439	28 choice.voters.add(self.user)

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