django.contrib.postgres.aggregates.general のソースコード
from django.contrib.postgres.fields import JSONField
from django.db.models.aggregates import Aggregate
__all__ = [
'ArrayAgg', 'BitAnd', 'BitOr', 'BoolAnd', 'BoolOr', 'JSONBAgg', 'StringAgg',
]
[ドキュメント]class ArrayAgg(Aggregate):
function = 'ARRAY_AGG'
template = '%(function)s(%(distinct)s%(expressions)s)'
def __init__(self, expression, distinct=False, **extra):
super().__init__(expression, distinct='DISTINCT ' if distinct else '', **extra)
def convert_value(self, value, expression, connection):
if not value:
return []
return value
[ドキュメント]class JSONBAgg(Aggregate):
function = 'JSONB_AGG'
output_field = JSONField()
def convert_value(self, value, expression, connection):
if not value:
return []
return value
[ドキュメント]class StringAgg(Aggregate):
function = 'STRING_AGG'
template = "%(function)s(%(distinct)s%(expressions)s, '%(delimiter)s')"
def __init__(self, expression, delimiter, distinct=False, **extra):
distinct = 'DISTINCT ' if distinct else ''
super().__init__(expression, delimiter=delimiter, distinct=distinct, **extra)
def convert_value(self, value, expression, connection):
if not value:
return ''
return value