1 from django import forms
2 from django.forms.models import ModelChoiceIterator
3 from django.utils.translation import ugettext as _
6 from catalogue.models import Lesson
9 class GroupedModelChoiceIterator(ModelChoiceIterator):
10 def __init__(self, field):
11 super(GroupedModelChoiceIterator, self).__init__(field)
12 self.queryset = self.field.grouping_model.objects
13 self.items_queryset = self.field.queryset
15 def choice(self, obj):
16 items_query = self.items_queryset.filter(**{self.field.grouping_fk_field: obj})
17 items = [super(GroupedModelChoiceIterator, self).choice(item) for item in items_query.all()]
18 return (unicode(obj), items)
21 class GroupedModelChoiceField(forms.ModelChoiceField):
23 def __init__(self, queryset, grouping_fk_field, **kwargs):
24 self.grouping_fk_field = grouping_fk_field
25 self.grouping_model = queryset.model._meta.get_field(grouping_fk_field).rel.to
26 super(GroupedModelChoiceField, self).__init__(queryset, **kwargs)
28 def _get_choices(self):
29 toret = super(GroupedModelChoiceField, self)._get_choices()
30 if isinstance(toret, ModelChoiceIterator):
31 toret = GroupedModelChoiceIterator(self)
34 choices = property(_get_choices, forms.ModelChoiceField.choices.fset)
37 class PostForm(pybb.forms.PostForm):
38 lesson = GroupedModelChoiceField(label = _('Related lesson'), queryset = Lesson.objects.all(),
39 grouping_fk_field = 'section', required = False)