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import json
import warnings
from django.contrib.postgres.fields import ArrayField
from django.db.models import Aggregate, BooleanField, JSONField, TextField, Value
from django.utils.deprecation import RemovedInDjango51Warning
from .mixins import OrderableAggMixin
__all__ = [
"ArrayAgg",
"BitAnd",
"BitOr",
"BitXor",
"BoolAnd",
"BoolOr",
"JSONBAgg",
"StringAgg",
]
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)
class BitAnd(Aggregate):
function = "BIT_AND"
class BitOr(Aggregate):
function = "BIT_OR"
class BitXor(Aggregate):
function = "BIT_XOR"
class BoolAnd(Aggregate):
function = "BOOL_AND"
output_field = BooleanField()
class BoolOr(Aggregate):
function = "BOOL_OR"
output_field = BooleanField()
class JSONBAgg(OrderableAggMixin, Aggregate):
function = "JSONB_AGG"
template = "%(function)s(%(distinct)s%(expressions)s %(ordering)s)"
allow_distinct = True
output_field = JSONField()
# RemovedInDjango51Warning: When the deprecation ends, remove __init__().
def __init__(self, *expressions, default=None, **extra):
super().__init__(*expressions, default=default, **extra)
if (
isinstance(default, Value)
and isinstance(default.value, str)
and not isinstance(default.output_field, JSONField)
):
value = default.value
try:
decoded = json.loads(value)
except json.JSONDecodeError:
warnings.warn(
"Passing a Value() with an output_field that isn't a JSONField as "
"JSONBAgg(default) is deprecated. Pass default="
f"Value({value!r}, output_field=JSONField()) instead.",
stacklevel=2,
category=RemovedInDjango51Warning,
)
self.default.output_field = self.output_field
else:
self.default = Value(decoded, self.output_field)
warnings.warn(
"Passing an encoded JSON string as JSONBAgg(default) is "
f"deprecated. Pass default={decoded!r} instead.",
stacklevel=2,
category=RemovedInDjango51Warning,
)
class StringAgg(OrderableAggMixin, Aggregate):
function = "STRING_AGG"
template = "%(function)s(%(distinct)s%(expressions)s %(ordering)s)"
allow_distinct = True
output_field = TextField()
def __init__(self, expression, delimiter, **extra):
delimiter_expr = Value(str(delimiter))
super().__init__(expression, delimiter_expr, **extra)
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