1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
|
from django.contrib.postgres.fields import JSONField
from django.db.models import Value
from django.db.models.aggregates import Aggregate
__all__ = [
'ArrayAgg', 'BitAnd', 'BitOr', 'BoolAnd', 'BoolOr', 'JSONBAgg', '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 JSONBAgg(Aggregate):
function = 'JSONB_AGG'
_output_field = JSONField()
def convert_value(self, value, expression, connection, context):
if not value:
return []
return value
class StringAgg(Aggregate):
function = 'STRING_AGG'
template = '%(function)s(%(distinct)s%(expressions)s)'
def __init__(self, expression, delimiter, distinct=False, **extra):
distinct = 'DISTINCT ' if distinct else ''
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
|
