64 lines
1.6 KiB
Python
64 lines
1.6 KiB
Python
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from django.contrib.postgres.fields import ArrayField, JSONField
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from django.db.models.aggregates import Aggregate
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__all__ = [
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'ArrayAgg', 'BitAnd', 'BitOr', 'BoolAnd', 'BoolOr', 'JSONBAgg', 'StringAgg',
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]
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class ArrayAgg(Aggregate):
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function = 'ARRAY_AGG'
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template = '%(function)s(%(distinct)s%(expressions)s)'
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@property
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def output_field(self):
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return ArrayField(self.source_expressions[0].output_field)
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def __init__(self, expression, distinct=False, **extra):
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super().__init__(expression, distinct='DISTINCT ' if distinct else '', **extra)
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def convert_value(self, value, expression, connection):
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if not value:
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return []
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return value
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class BitAnd(Aggregate):
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function = 'BIT_AND'
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class BitOr(Aggregate):
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function = 'BIT_OR'
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class BoolAnd(Aggregate):
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function = 'BOOL_AND'
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class BoolOr(Aggregate):
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function = 'BOOL_OR'
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class JSONBAgg(Aggregate):
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function = 'JSONB_AGG'
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output_field = JSONField()
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def convert_value(self, value, expression, connection):
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if not value:
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return []
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return value
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class StringAgg(Aggregate):
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function = 'STRING_AGG'
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template = "%(function)s(%(distinct)s%(expressions)s, '%(delimiter)s')"
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def __init__(self, expression, delimiter, distinct=False, **extra):
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distinct = 'DISTINCT ' if distinct else ''
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super().__init__(expression, delimiter=delimiter, distinct=distinct, **extra)
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def convert_value(self, value, expression, connection):
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if not value:
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return ''
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return value
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