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9e2b0574ee
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from django.contrib.admin.filterspecs import FilterSpec, BooleanFieldFilterSpec
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class IsNegativeFilterSpec(FilterSpec):
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""" Custom filter to display only users with negative balance """
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def __init__(self, f, request, *args, **kwargs):
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super(IsNegativeFilterSpec, self).__init__(f, request, *args, **kwargs)
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self.lookup_kwarg = '%s__lt' % f.name
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self.lookup_val = request.GET.get(self.lookup_kwarg, None) # Check if current request already has a filter
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def title(self):
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return 'Kontostand'
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def choices(self, cl):
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yield {
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'selected': self.lookup_val == None,
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'query_string': "?",
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'display': 'Alle'}
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yield {
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'selected': self.lookup_val == '0',
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'query_string': cl.get_query_string(
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{self.lookup_kwarg: 0},
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['balance__isnull']),
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'display': 'Nur Negative'}
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FilterSpec.filter_specs.insert(0, (lambda f: getattr(f, 'has_negative_filter', False), IsNegativeFilterSpec))
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