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[1.7.x] Fixed #22563: Better error message when trying to change AUTH_USER_MODEL 

You're not allowed to do this after you've made migrations; see ticket
for more details.
This commit is contained in:
Andrew Godwin 2014-05-07 13:04:29 -07:00
parent af06203cea
commit f67433e74b
1 changed files with 14 additions and 3 deletions
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17
django/db/migrations/state.py
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@ -5,6 +5,7 @@ from django.apps.registry import Apps, apps as global_apps
from django.db import models
from django.db.models.options import DEFAULT_NAMES, normalize_together
from django.db.models.fields.related import do_pending_lookups
from django.conf import settings
from django.utils import six
from django.utils.encoding import force_text
from django.utils.module_loading import import_string
@ -74,13 +75,23 @@ class ProjectState(object):
try:
model = self.apps.get_model(lookup_model[0], lookup_model[1])
except LookupError:
# If the lookup failed to something that looks like AUTH_USER_MODEL,
# give a better error message about how you can't change it (#22563)
extra_message = ""
if "%s.%s" % (lookup_model[0], lookup_model[1]) == settings.AUTH_USER_MODEL:
extra_message = (
"\nThe missing model matches AUTH_USER_MODEL; if you've changed the value of this" +
"\nsetting after making a migration, be aware that this is not supported. If you" +
"\nchange AUTH_USER_MODEL you must delete and recreate migrations for its app."
)
# Raise an error with a best-effort helpful message
# (only for the first issue). Error message should look like:
# "ValueError: Lookup failed for model referenced by
# field migrations.Book.author: migrations.Author"
raise ValueError("Lookup failed for model referenced by field {field}: {model[0]}.{model[1]}".format(
field=operations[0][1],
model=lookup_model
raise ValueError("Lookup failed for model referenced by field {field}: {model[0]}.{model[1]}{extra_message}".format(
field = operations[0][1],
model = lookup_model,
extra_message = extra_message,
))
else:
do_pending_lookups(model)