#23521: removal of concrete Model from bases doesn't remove it from ModelState
bases
-------------------------------------+-------------------------------------
Reporter: Sergey Fedoseev | Owner: Sergey
| Fedoseev
Type: Bug | Status: new
Component: Migrations | Version: 1.7
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 rm_):
I had the need as described in #23818 but instead of squashing migrations
i've created a migrations operator to update the bases on migrations
models state. This works fine for me on django 1.8. I still haven't tested
if django master behaves differently. Do you think this is a valuable
addition to django?
{{{
class AlterBaseOperation(Operation):
reduce_to_sql = False
reversible = True
def __init__(self, model_name, bases, prev_bases):
self.model_name = model_name
self.bases = bases
self.prev_bases = prev_bases
def state_forwards(self, app_label, state):
state.models[app_label, self.model_name].bases = self.bases
state.reload_model(app_label, self.model_name)
def state_backwards(self, app_label, state):
state.models[app_label, self.model_name].bases = self.prev_bases
state.reload_model(app_label, self.model_name)
def database_forwards(self, app_label, schema_editor, from_state,
to_state):
pass
def database_backwards(self, app_label, schema_editor, from_state,
to_state):
pass
def describe(self):
return "Update %s bases to %s" % (self.model_name, self.bases)
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/23521#comment:16>
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