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

from django.db.models.aggregates import Aggregate

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



[docs]class ArrayAgg(Aggregate):
    function = 'ARRAY_AGG'

    def convert_value(self, value, expression, connection, context):
        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 StringAgg(Aggregate):
    function = 'STRING_AGG'
    template = "%(function)s(%(expressions)s, '%(delimiter)s')"

    def __init__(self, expression, delimiter, **extra):
        super(StringAgg, self).__init__(expression, delimiter=delimiter, **extra)

    def convert_value(self, value, expression, connection, context):
        if not value:
            return ''
        return value
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