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48 lines
1.7 KiB
48 lines
1.7 KiB
# -*- 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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