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18 lines
458 B
Python
18 lines
458 B
Python
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from django.db.models import CharField, Lookup
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class Empty(Lookup):
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"""
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Filter on whether a string is empty.
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"""
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lookup_name = 'empty'
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def as_sql(self, qn, connection):
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lhs, lhs_params = self.process_lhs(qn, connection)
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rhs, rhs_params = self.process_rhs(qn, connection)
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params = lhs_params + rhs_params
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return 'CAST(LENGTH(%s) AS BOOLEAN) != %s' % (lhs, rhs), params
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CharField.register_lookup(Empty)
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