Code source de django.contrib.postgres.aggregates.general

from django.contrib.postgres.fields import ArrayField, JSONField
from django.db.models.aggregates import Aggregate

from .mixins import OrderableAggMixin

__all__ = [
    'ArrayAgg', 'BitAnd', 'BitOr', 'BoolAnd', 'BoolOr', 'JSONBAgg', 'StringAgg',
]


[docs]class ArrayAgg(OrderableAggMixin, Aggregate): function = 'ARRAY_AGG' template = '%(function)s(%(distinct)s%(expressions)s %(ordering)s)' allow_distinct = True @property def output_field(self): return ArrayField(self.source_expressions[0].output_field) def convert_value(self, value, expression, connection): if not value: return [] return value
[docs]class BitAnd(Aggregate): function = 'BIT_AND'
[docs]class BitOr(Aggregate): function = 'BIT_OR'
[docs]class BoolAnd(Aggregate): function = 'BOOL_AND'
[docs]class BoolOr(Aggregate): function = 'BOOL_OR'
[docs]class JSONBAgg(Aggregate): function = 'JSONB_AGG' output_field = JSONField() def convert_value(self, value, expression, connection): if not value: return [] return value
[docs]class StringAgg(OrderableAggMixin, Aggregate): function = 'STRING_AGG' template = "%(function)s(%(distinct)s%(expressions)s, '%(delimiter)s'%(ordering)s)" allow_distinct = True def __init__(self, expression, delimiter, **extra): super().__init__(expression, delimiter=delimiter, **extra) def convert_value(self, value, expression, connection): if not value: return '' return value
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