Re: Problem with migrations order

make sure you tell django that you have make changes the by running this

python manage.py makemigrations

after that 

enter python manage.py migrate

it will automatically update your database

On Tuesday, March 24, 2020 at 7:36:31 PM UTC+14, Yves de Champlain wrote:

Hi

I added a new app 'portfolio' in my project, but since then migrations won't work anymore because Django seems to be trying to do them in the wrong order.

Running migrations:

Applying core.0001_initial... OK

Applying contenttypes.0001_initial... OK

Applying contenttypes.0002_remove_content_type_name... OK

Applying auth.0001_initial... OK

Applying auth.0002_alter_permission_name_max_length... OK

Applying auth.0003_alter_user_email_max_length... OK

Applying auth.0004_alter_user_username_opts... OK

Applying auth.0005_alter_user_last_login_null... OK

Applying auth.0006_require_contenttypes_0002... OK

Applying auth.0007_alter_validators_add_error_messages... OK

Applying auth.0008_alter_user_username_max_length... OK

Applying auth.0009_alter_user_last_name_max_length... OK

Applying auth.0010_alter_group_name_max_length... OK

Applying auth.0011_update_proxy_permissions... OK

Applying user.0001_initial... OK

Applying admin.0001_initial... OK

Applying admin.0002_logentry_remove_auto_add... OK

Applying admin.0003_logentry_add_action_flag_choices... OK

Applying data.0001_initial... OK

Applying data.0002_auto_20200306_1522...Traceback (most recent call last):

File "/opt/miniconda3/envs/cert_tool/lib/python3.7/site-packages/django/apps/registry.py", line 155, in get_app_config

  return self.app_configs[app_label]

KeyError: 'portfolio'

During handling of the above exception, another exception occurred:

[...]

LookupError: No installed app with label 'portfolio'.

portfolio is listed in my INSTALLED_APPS :

LOCAL_APPS = (

    'core',

    'portfolio',

    'user',

    'data',

    'editor',

)

INSTALLED_APPS = DJANGO_APPS + LOCAL_APPS + THIRD_PARTY_APPS

If I add a dependency in the problematic data.0002_auto_20200306_1522 migration : 

class Migration(migrations.Migration):

    dependencies = [

        ('data', '0001_initial'),

        ('portfolio', '0001_initial'),

    ]

Other errors occur :

django.db.migrations.exceptions.NodeNotFoundError: Migration data.0002_auto_20200306_1522 dependencies reference nonexistent parent node ('portfolio', '0001_initial')

Traceback (most recent call last):

  File "/opt/miniconda3/envs/cert_tool/lib/python3.7/site-packages/django/db/migrations/loader.py", line 166, in check_key

    return self.graph.root_nodes(key[0])[0]

IndexError: list index out of range

During handling of the above exception, another exception occurred:

[...]

File "/opt/miniconda3/envs/cert_tool/lib/python3.7/site-packages/django/db/migrations/loader.py", line 173, in check_key

    raise ValueError("Dependency on app with no migrations: %s" % key[0])

ValueError: Dependency on app with no migrations: user

I get the same results with 'run_before'

The only way I have to make things work again is to comment out 'data' from INSTALLED_APPS, make migrations, remove comments and migrate again : 

Operations to perform: 
  Apply all migrations: admin, auth, contenttypes, core, portfolio, sessions, user 
Running migrations:
  Applying core.0001_initial... OK
  Applying contenttypes.0001_initial... OK
  Applying contenttypes.0002_remove_content_type_name... OK
  Applying auth.0001_initial... OK
  Applying auth.0002_alter_permission_name_max_length... OK
  Applying auth.0003_alter_user_email_max_length... OK
  Applying auth.0004_alter_user_username_opts... OK
  Applying auth.0005_alter_user_last_login_null... OK
  Applying auth.0006_require_contenttypes_0002... OK
  Applying auth.0007_alter_validators_add_error_messages... OK
  Applying auth.0008_alter_user_username_max_length... OK
  Applying auth.0009_alter_user_last_name_max_length... OK
  Applying auth.0010_alter_group_name_max_length... OK
  Applying auth.0011_update_proxy_permissions... OK
  Applying user.0001_initial... OK
  Applying admin.0001_initial... OK
  Applying admin.0002_logentry_remove_auto_add... OK
  Applying admin.0003_logentry_add_action_flag_choices... OK
  Applying portfolio.0001_initial... OK
  Applying portfolio.0002_auto_20200324_0131... OK
  Applying sessions.0001_initial... OK
(cert_tool) yves@C50484 passages_nds % python manage.py migrate
Operations to perform:
  Apply all migrations: admin, auth, contenttypes, core, data, portfolio, sessions, user
Running migrations:
  Applying data.0001_initial... OK
  Applying data.0002_auto_20200306_1522... OK
  Applying data.0003_auto_20200318_1722... OK

Any help would be very much appreciated !

Thanks !

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