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from django.db.models.aggregates import Aggregate
__all__ = [
'ArrayAgg', 'BitAnd', 'BitOr', 'BoolAnd', 'BoolOr', 'StringAgg',
]
class ArrayAgg(Aggregate):
function = 'ARRAY_AGG'
def convert_value(self, value, expression, connection, context):
if not value:
return []
return value
class BitAnd(Aggregate):
function = 'BIT_AND'
class BitOr(Aggregate):
function = 'BIT_OR'
class BoolAnd(Aggregate):
function = 'BOOL_AND'
class BoolOr(Aggregate):
function = 'BOOL_OR'
class StringAgg(Aggregate):
function = 'STRING_AGG'
template = "%(function)s(%(distinct)s%(expressions)s)"
def __init__(self, expression, delimiter, **extra):
delimiter_expr = Value(str(delimiter))
super(StringAgg, self).__init__(expression, delimiter_expr, distinct=distinct, **extra)
def convert_value(self, value, expression, connection, context):
if not value:
return ''
return value
|
