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from django.core import checks
class CheckFieldDefaultMixin:
_default_hint = ('<valid default>', '<invalid default>')
def _check_default(self):
if self.has_default() and self.default is not None and not callable(self.default):
return [
checks.Warning(
"%s default should be a callable instead of an instance so "
"that it's not shared between all field instances." % (
self.__class__.__name__,
),
hint=(
'Use a callable instead, e.g., use `%s` instead of '
'`%s`.' % self._default_hint
),
obj=self,
id='postgres.E003',
)
]
else:
return []
def check(self, **kwargs):
errors = super().check(**kwargs)
errors.extend(self._check_default())
return errors
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