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

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

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



[docs]class ArrayAgg(Aggregate):
    function = 'ARRAY_AGG'
    template = '%(function)s(%(distinct)s%(expressions)s)'

    @property
    def output_field(self):
        return ArrayField(self.source_expressions[0].output_field)

    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




[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(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
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