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Fixed #31660 -- Fixed queryset crash when grouping by m2o relation.

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Regression in 3a941230c8.

Thanks Tomasz Szymański for the report.
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Mariusz Felisiak 2020-06-08 07:21:54 +02:00 • committed by GitHub
parent 07506a6114
commit 78ad4b4b02
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3 changed files with 30 additions and 4 deletions
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4
django/db/models/expressions.py
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@ -383,7 +383,9 @@ class BaseExpression:
Custom format for select clauses. For example, EXISTS expressions need
to be wrapped in CASE WHEN on Oracle.
"""
return self.output_field.select_format(compiler, sql, params)
if hasattr(self.output_field, 'select_format'):
return self.output_field.select_format(compiler, sql, params)
return sql, params
@cached_property
def identity(self):