
3 changed files with 42 additions and 2 deletions
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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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