diff --git a/shared/utils/views/__init__.py b/shared/utils/views/__init__.py new file mode 100644 index 0000000..e69de29 diff --git a/shared/utils/views/alphabetical_pagination.py b/shared/utils/views/alphabetical_pagination.py new file mode 100644 index 0000000..352df0f --- /dev/null +++ b/shared/utils/views/alphabetical_pagination.py @@ -0,0 +1,48 @@ +# -*- coding: utf-8 -*- +from __future__ import unicode_literals + +from django.db.models import F, Func, Value + + +class AlphabeticalPaginationMixin(object): + alphabetical_pagination_field = 'name' + + def get_alphabetical_pagination_field(self): + return self.alphabetical_pagination_field + + def get_selected_letter(self): + return self.request.GET.get('letter', 'a') + + def get_base_queryset(self): + """ + Queryset before applying pagination filters. + """ + qs = super(AlphabeticalPaginationMixin, self).get_queryset().exclude( + **{self.get_alphabetical_pagination_field(): ''} + ) + return qs + + def get_queryset(self): + qs = self.get_base_queryset() + # FIXME Select Umlauts (using downgrade and also downgrade sort_name field?) + # FIXME Select on TRIM/LEFT as in get_letter_choices + filter = { + "{}__istartswith".format(self.get_alphabetical_pagination_field()): + self.get_selected_letter()} + return qs.filter(**filter) + + def get_letter_choices(self): + return self.get_base_queryset().annotate(name_lower=Func( + Func( + Func( + F(self.get_alphabetical_pagination_field()), function='LOWER'), + function='TRIM'), + Value("1"), function='LEFT')).order_by( + 'name_lower').distinct('name_lower').values_list('name_lower', flat=True) + + def get_context_data(self, **kwargs): + context = super(AlphabeticalPaginationMixin, self).get_context_data(**kwargs) + context['selected_letter'] = self.get_selected_letter() + context['alphabet'] = self.get_letter_choices() + return context +