#28073: RemoveField.state_forwards() crashes with AttributeError: 'NoneType'
object
has no attribute 'is_relation'
---------------------------------+------------------------------------
Reporter: Logan Gunthorpe | Owner: nobody
Type: Bug | Status: new
Component: Migrations | Version: 1.11
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
---------------------------------+------------------------------------
Comment (by python-force):
Testvinder add this line to the code and in the console you'll see where
it breaks and that will give you idea where to look.
{{{
print app_label + " " + self.model_name_lower + " " + self.name
}}}
{{{
def state_forwards(self, app_label, state):
new_fields = []
old_field = None
print app_label + " " + self.model_name_lower + " " + self.name
for name, instance in state.models[app_label,
self.model_name_lower].fields:
if name != self.name:
new_fields.append((name, instance))
else:
old_field = instance
state.models[app_label, self.model_name_lower].fields = new_fields
# Delay rendering of relationships if it's not a relational field
delay = not old_field.is_relation
state.reload_model(app_label, self.model_name_lower, delay=delay)
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/28073#comment:13>
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