+class TagForm(forms.Form):
+ def __init__(self, category, instance=None, *args, **kwargs):
+ super(TagForm, self).__init__(*args, **kwargs)
+ self.category = category
+ self.instance = instance
+ self.field().queryset = Tag.objects.filter(category=self.category)
+ self.field().label = self.category.label
+ if self.instance:
+ self.field().initial = self.initial()
+
+ def save(self):
+ assert self.instance, 'No instance provided'
+ self.instance.tags.remove(*self.instance.tags.filter(category=self.category))
+ self.instance.tags.add(self.cleaned_tags())
+
+ def field(self):
+ raise NotImplementedError
+
+ def initial(self):
+ raise NotImplementedError
+
+ def cleaned_tags(self):
+ raise NotImplementedError
+
+
+class TagSingleForm(TagForm):
+ tag = forms.ModelChoiceField(Tag.objects.none())
+
+ def field(self):
+ return self.fields['tag']
+
+ def initial(self):
+ return self.instance.tags.get(category=self.category)
+
+ def cleaned_tags(self):
+ return [self.cleaned_data['tag']]
+
+
+class TagMultipleForm(TagForm):
+ tags = forms.ModelMultipleChoiceField(Tag.objects.none(), required=False)
+
+ def field(self):
+ return self.fields['tags']
+
+ def initial(self):
+ return self.instance.tags.filter(category=self.category)
+
+ def cleaned_tags(self):
+ return self.cleaned_data['tags']
+
+