Argthtjtr

My operation inside my migration is executed, whereas nothing happened into the database concerning the payer field.

Here's my model:

class User(AbstractBaseUser, PermissionsMixin, WithCsvImportMixin):

    first_name = models.CharField(_('first name'), max_length=30, blank=False)

    last_name = models.CharField(_('last name'), max_length=30, blank=False)

    email = models.EmailField(_('email address'),

                              unique=True, blank=False)

    external_id = models.CharField(_('external id'), db_index=True, max_length=50, unique=True, blank=False, null=True)

    is_staff = models.BooleanField(_('staff status'), default=False)

    is_active = models.BooleanField(_('active'), default=True)

    date_joined = models.DateTimeField(_('date joined'), default=timezone.now)

    payer = models.CharField(_('payer'), max_length=50, blank=False, default='')

The first migration concerning the payer field:

# -*- coding: utf-8 -*-

# Generated by Django 1.11.6 on 2018-11-15 21:58

from __future__ import unicode_literals



from django.db import migrations, models





class Migration(migrations.Migration):



    dependencies = [

        ('authenticate', '0012_auto_20181112_1631'),

    ]



    operations = [

        migrations.AddField(

            model_name='user',

            name='payer',

            field=models.CharField(default='', max_length=50, verbose_name='payer'),

        ),

    ]

And this is the one that is executed but the result doesn't seems to be applied to the database:

# -*- coding: utf-8 -*-

# Generated by Django 1.11.6 on 2018-11-15 22:01

from django.db import migrations, transaction



from xxx.authenticate.models import User # The xxx is here to replace the actual application name



def create_payer_names(apps, schema_editor):

    with transaction.atomic():

        for user in User.objects.all():

            if user.external_id != "":

                user.payer = user.external_id

                user.save()



class Migration(migrations.Migration):



    dependencies = [

        ('authenticate', '0013_user_payer'),

    ]



    operations = [

        migrations.RunPython(create_payer_names, migrations.RunPython.noop, atomic=True),

    ]

My database is already populated, and each user has an external_id

>>> from xxx.authenticate.models import User

>>> for item in User.objects.all():

...     print(item.external_id)

... 

043819FZAFR

762944FZAFR

285895FZAFR

671800FZAFR

924618FZAFR

068805FZAFR

232544FZAFR

130978FZAFR

412568FZAFR

600003FZAFR

254624FZAFR

417745FZAFR

068280FZAFR

031971FZAFR

141936FZAFR

>>> 

And here is the empty result of previous migrations:

>>> for item in User.objects.all():

...     print(item.payer)

... 















































>>> 

Here's the output for the command : manage.py showmigrations

authenticate

 [X] 0001_initial

 [X] 0002_auto_20171103_1722

 [X] 0003_auto_20171109_1206

 [X] 0004_auto_20180329_1049

 [X] 0005_auto_20180507_1123

 [X] 0006_user_by_pass_generates_invoice

 [X] 0007_auto_20180524_1732

 [X] 0008_auto_20180530_1525

 [X] 0009_auto_20180801_1644

 [X] 0010_user_payment

 [X] 0011_remove_user_payment

 [X] 0012_auto_20181112_1631

 [X] 0013_user_payer

 [X] 0014_auto_20181115_2301

And when I do:

./manage.py migrate authenticate 0014

The output is the following:

Running migrations:

  No migrations to apply.

Could someone explain to me what I'm doing wrong and why the migration operation isn't applied as it's supposed to be?

In the migration, you should use apps.get_model to get the User model. See the docs on [data migrations] for more info.

def create_payer_names(apps, schema_editor):

    User = apps.get_model('authentication', 'User')

    with transaction.atomic():

        ...

The output of showmigrations is showing that migration 0014 has already been applied. That's why you get the No migrations to apply message.

 [X] 0014_auto_20181115_2301

You could re-run the 0014 migration by faking back to the 0013 migration first.

./manage.py migrate --fake authenticate 0013

./manage.py migrate authenticate 0014