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from django.db.models import Lookup, Transform
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 FunctionTransform(Transform):
def as_sql(self, qn, connection):
lhs, params = qn.compile(self.lhs)
return "%s(%s)" % (self.function, lhs), params
class DataContains(PostgresSimpleLookup):
lookup_name = 'contains'
operator = '@>'
class ContainedBy(PostgresSimpleLookup):
lookup_name = 'contained_by'
operator = '<@'
class Overlap(PostgresSimpleLookup):
lookup_name = 'overlap'
operator = '&&'
class Unaccent(FunctionTransform):
bilateral = True
lookup_name = 'unaccent'
function = 'UNACCENT'
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