Исходный код django.contrib.postgres.aggregates.general

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

from .mixins import OrderableAggMixin

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


[документация]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
[документация]class BitAnd(Aggregate): function = 'BIT_AND'
[документация]class BitOr(Aggregate): function = 'BIT_OR'
[документация]class BoolAnd(Aggregate): function = 'BOOL_AND' output_field = BooleanField()
[документация]class BoolOr(Aggregate): function = 'BOOL_OR' output_field = BooleanField()
[документация]class JSONBAgg(OrderableAggMixin, Aggregate): function = 'JSONB_AGG' template = '%(function)s(%(distinct)s%(expressions)s %(ordering)s)' allow_distinct = True output_field = JSONField() def convert_value(self, value, expression, connection): if not value: return '[]' return value
[документация]class StringAgg(OrderableAggMixin, Aggregate): function = 'STRING_AGG' template = '%(function)s(%(distinct)s%(expressions)s %(ordering)s)' allow_distinct = True def __init__(self, expression, delimiter, **extra): delimiter_expr = Value(str(delimiter)) super().__init__(expression, delimiter_expr, **extra) def convert_value(self, value, expression, connection): if not value: return '' return value
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