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# -*- coding: utf-8 -*-
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from __future__ import unicode_literals
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from django.db.models import F, Func, Value
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class AlphabeticalPaginationMixin(object):
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alphabetical_pagination_field = 'name'
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def get_alphabetical_pagination_field(self):
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return self.alphabetical_pagination_field
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def get_selected_letter(self):
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return self.request.GET.get('letter', 'a')
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def get_base_queryset(self):
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"""
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Queryset before applying pagination filters.
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"""
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qs = super(AlphabeticalPaginationMixin, self).get_queryset().exclude(
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**{self.get_alphabetical_pagination_field(): ''}
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)
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return qs
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def get_queryset(self):
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qs = self.get_base_queryset()
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# FIXME Select Umlauts (using downgrade and also downgrade sort_name field?)
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# FIXME Select on TRIM/LEFT as in get_letter_choices
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filter = {
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"{}__istartswith".format(self.get_alphabetical_pagination_field()):
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self.get_selected_letter()}
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return qs.filter(**filter).order_by(self.alphabetical_pagination_field)
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def get_letter_choices(self):
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return self.get_base_queryset().annotate(name_lower=Func(
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Func(
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Func(
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F(self.get_alphabetical_pagination_field()), function='LOWER'),
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function='TRIM'),
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Value("1"), function='LEFT')).order_by(
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'name_lower').distinct('name_lower').values_list('name_lower', flat=True)
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def get_context_data(self, **kwargs):
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context = super(AlphabeticalPaginationMixin, self).get_context_data(**kwargs)
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context['selected_letter'] = self.get_selected_letter()
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context['alphabet'] = self.get_letter_choices()
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return context
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