77 lines
1.9 KiB
Python
77 lines
1.9 KiB
Python
from django.db.models import Lookup, Transform
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from django.db.models.lookups import Exact
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from .search import SearchVector, SearchVectorExact, SearchVectorField
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class PostgresSimpleLookup(Lookup):
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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 '%s %s %s' % (lhs, self.operator, rhs), params
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class DataContains(PostgresSimpleLookup):
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lookup_name = 'contains'
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operator = '@>'
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class ContainedBy(PostgresSimpleLookup):
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lookup_name = 'contained_by'
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operator = '<@'
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class Overlap(PostgresSimpleLookup):
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lookup_name = 'overlap'
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operator = '&&'
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class HasKey(PostgresSimpleLookup):
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lookup_name = 'has_key'
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operator = '?'
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prepare_rhs = False
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class HasKeys(PostgresSimpleLookup):
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lookup_name = 'has_keys'
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operator = '?&'
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def get_prep_lookup(self):
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return [str(item) for item in self.rhs]
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class HasAnyKeys(HasKeys):
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lookup_name = 'has_any_keys'
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operator = '?|'
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class Unaccent(Transform):
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bilateral = True
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lookup_name = 'unaccent'
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function = 'UNACCENT'
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class SearchLookup(SearchVectorExact):
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lookup_name = 'search'
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def process_lhs(self, qn, connection):
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if not isinstance(self.lhs.output_field, SearchVectorField):
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self.lhs = SearchVector(self.lhs)
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lhs, lhs_params = super().process_lhs(qn, connection)
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return lhs, lhs_params
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class TrigramSimilar(PostgresSimpleLookup):
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lookup_name = 'trigram_similar'
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operator = '%%'
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class JSONExact(Exact):
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can_use_none_as_rhs = True
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def process_rhs(self, compiler, connection):
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result = super().process_rhs(compiler, connection)
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# Treat None lookup values as null.
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return ("'null'", []) if result == ('%s', [None]) else result
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