I'm not sure. It looks like the crash happens when creating the model in
the migration, not during the RunPython function. Could you create a
minimal project that reproduces the crash so I can step through it?
On Monday, October 24, 2016 at 3:22:18 PM UTC-4, dy...@dylan-jenkinson.nz
wrote:
>
> Hi Tim,
>
> Traceback is below.
>
> As a temporary measure to get me going I have commented out the existing
> migrations that added and removed the migrations. There is an initial
> migration that adds the FK, a RunPython that checks for the FK to perform
> some logic, and a migration to remove the FK. The RunPython does not import
> the model that has the FK. It uses the apps.get_model() method. I have also
> added the function called by RunPython below, in case that is of any use.
>
> Thanks,
> Dylan
>
> Traceback:
> Traceback (most recent call last):
> File
> "/home/dev/Programs/pycharm-2016.1.4/helpers/pycharm/django_manage.py",
> line 41, in <module>
> run_module(manage_file, None, '__main__', True)
> File "/app/python3/lib/python3.5/runpy.py", line 196, in run_module
> return _run_module_code(code, init_globals, run_name, mod_spec)
> File "/app/python3/lib/python3.5/runpy.py", line 96, in _run_module_code
> mod_name, mod_spec, pkg_name, script_name)
> File "/app/python3/lib/python3.5/runpy.py", line 85, in _run_code
> exec(code, run_globals)
> File "/wip/projects/progress/base/manage.py", line 10, in <module>
> execute_from_command_line(sys.argv)
> File
> "/wip/environments/progress/lib/python3.5/site-packages/django/core/management/__init__.py",
>
> line 354, in execute_from_command_line
> utility.execute()
> File
> "/wip/environments/progress/lib/python3.5/site-packages/django/core/management/__init__.py",
>
> line 346, in execute
> self.fetch_command(subcommand).run_from_argv(self.argv)
> File
> "/wip/environments/progress/lib/python3.5/site-packages/django/core/management/base.py",
>
> line 394, in run_from_argv
> self.execute(*args, **cmd_options)
> File
> "/wip/environments/progress/lib/python3.5/site-packages/django/core/management/base.py",
>
> line 445, in execute
> output = self.handle(*args, **options)
> File
> "/wip/environments/progress/lib/python3.5/site-packages/django/core/management/commands/migrate.py",
>
> line 222, in handle
> executor.migrate(targets, plan, fake=fake, fake_initial=fake_initial)
> File
> "/wip/environments/progress/lib/python3.5/site-packages/django/db/migrations/executor.py",
>
> line 110, in migrate
> self.apply_migration(states[migration], migration, fake=fake,
> fake_initial=fake_initial)
> File
> "/wip/environments/progress/lib/python3.5/site-packages/django/db/migrations/executor.py",
>
> line 148, in apply_migration
> state = migration.apply(state, schema_editor)
> File
> "/wip/environments/progress/lib/python3.5/site-packages/django/db/migrations/migration.py",
>
> line 115, in apply
> operation.database_forwards(self.app_label, schema_editor, old_state,
> project_state)
> File
> "/wip/environments/progress/lib/python3.5/site-packages/django/db/migrations/operations/models.py",
>
> line 59, in database_forwards
> schema_editor.create_model(model)
> File
> "/wip/environments/progress/lib/python3.5/site-packages/django/db/backends/base/schema.py",
>
> line 236, in create_model
> definition, extra_params = self.column_sql(model, field)
> File
> "/wip/environments/progress/lib/python3.5/site-packages/django/db/backends/base/schema.py",
>
> line 135, in column_sql
> db_params = field.db_parameters(connection=self.connection)
> File
> "/wip/environments/progress/lib/python3.5/site-packages/django/db/models/fields/related.py",
>
> line 2010, in db_parameters
> return {"type": self.db_type(connection), "check": []}
> File
> "/wip/environments/progress/lib/python3.5/site-packages/django/db/models/fields/related.py",
>
> line 2001, in db_type
> rel_field = self.related_field
> File
> "/wip/environments/progress/lib/python3.5/site-packages/django/db/models/fields/related.py",
>
> line 1904, in related_field
> return self.foreign_related_fields[0]
> File
> "/wip/environments/progress/lib/python3.5/site-packages/django/db/models/fields/related.py",
>
> line 1638, in foreign_related_fields
> return tuple(rhs_field for lhs_field, rhs_field in self.related_fields
> if rhs_field)
> File
> "/wip/environments/progress/lib/python3.5/site-packages/django/db/models/fields/related.py",
>
> line 1625, in related_fields
> self._related_fields = self.resolve_related_fields()
> File
> "/wip/environments/progress/lib/python3.5/site-packages/django/db/models/fields/related.py",
>
> line 1610, in resolve_related_fields
> raise ValueError('Related model %r cannot be resolved' % self.rel.to)
> ValueError: Related model 'workflow.Event' cannot be resolved
>
> RunPython function:
> def load_email_sent_workflow(apps, schema_editor):
> if schema_editor.connection.alias == 'default':
> db_alias = schema_editor.connection.alias
> EmailSent = apps.get_model('common', 'EmailSent')
> for email_sent in
> EmailSent.objects.using(db_alias).exclude(event__isnull=True):
> if email_sent.event:
> email_sent.workflow = email_sent.event.workflow
> email_sent.save(update_fields=['workflow'])
>
>
>
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