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36 lines
1.0 KiB
Python
36 lines
1.0 KiB
Python
from django.db.models import CharField, Lookup
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from .fields import CachedValueField
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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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prepare_rhs = False
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def as_sql(self, compiler, connection):
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sql, params = compiler.compile(self.lhs)
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if self.rhs:
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return f"CAST(LENGTH({sql}) AS BOOLEAN) IS NOT TRUE", params
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else:
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return f"CAST(LENGTH({sql}) AS BOOLEAN) IS TRUE", params
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class NetContainsOrEquals(Lookup):
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"""
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This lookup has the same functionality as the one from the ipam app except lhs is cast to inet
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"""
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lookup_name = 'net_contains_or_equals'
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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(%s AS INET) >>= %s' % (lhs, rhs), params
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CharField.register_lookup(Empty)
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CachedValueField.register_lookup(NetContainsOrEquals)
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