#24690: ArrayField data bleeds between instances when using field.append(item)
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Reporter: redbeard0x0a | Owner:
Type: Bug | Status: new
Component: contrib.postgres | Version: 1.8
Severity: Normal | Keywords: ArrayField postgres
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
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I found an issue when upgrading to Django 1.8 and using the new ArrayField
and a model's instance methods.
This code will cause Model#array_field's data to bleed between different
instances.
{{{
def add_to_array(self, item):
if item not in self.array_field:
self.array_field.append(item)
}}}
However, this code does the correct thing:
{{{
def add_to_array(self, item):
existing = self.array_field
if item not in self.array_field:
self.array_field = existing + [item]
}}}
I put together a django project/app with the code and tests that show the
problems with self.array_field.append(). It also has a Vagrant file setup
that should also exhibit the problems.
https://github.com/redbeard0x0a/django18bug
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Ticket URL: <https://code.djangoproject.com/ticket/24690>
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