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from django.db.models import Lookup, Transform
from django.utils.encoding import force_text
from .search import SearchVector, SearchVectorExact, SearchVectorField
class PostgresSimpleLookup(Lookup):
def as_sql(self, qn, connection):
lhs, lhs_params = self.process_lhs(qn, connection)
rhs, rhs_params = self.process_rhs(qn, connection)
params = lhs_params + rhs_params
return '%s %s %s' % (lhs, self.operator, rhs), params
class DataContains(PostgresSimpleLookup):
lookup_name = 'contains'
operator = '@>'
class ContainedBy(PostgresSimpleLookup):
lookup_name = 'contained_by'
operator = '<@'
class Overlap(PostgresSimpleLookup):
lookup_name = 'overlap'
operator = '&&'
class HasKey(PostgresSimpleLookup):
lookup_name = 'has_key'
operator = '?'
prepare_rhs = False
class HasKeys(PostgresSimpleLookup):
lookup_name = 'has_keys'
operator = '?&'
def get_prep_lookup(self):
return [force_text(item) for item in self.rhs]
class HasAnyKeys(HasKeys):
lookup_name = 'has_any_keys'
operator = '?|'
class Unaccent(Transform):
bilateral = True
lookup_name = 'unaccent'
function = 'UNACCENT'
class SearchLookup(SearchVectorExact):
lookup_name = 'search'
def process_lhs(self, qn, connection):
if not isinstance(self.lhs.output_field, SearchVectorField):
self.lhs = SearchVector(self.lhs)
lhs, lhs_params = super(SearchLookup, self).process_lhs(qn, connection)
return lhs, lhs_params
class TrigramSimilar(PostgresSimpleLookup):
lookup_name = 'trigram_similar'
operator = '%%'
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