Django 1.8 migrations showing "AttributeError"

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vijay kumar

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Jul 27, 2015, 11:15:48 PM7/27/15

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Hi,

Problem: Empty migration doesn't show user friendly message.

When i run "python manage.py migrate" with no new migrations to be applied it show me error message "AttributeError: '_Meta' object has no attribute 'model_name'" instead of showing user friendly message "no migration to apply".

I have using python3.4.1, django 1.8.3

Steps to replicate: First run migrate command to apply all migrations, Next re-run same command again.

Below is trackback for reference.

Synchronizing apps without migrations:
Creating tables...
Running deferred SQL...
Installing custom SQL...
Running migrations:
No migrations to apply.

Traceback (most recent call last):
File "manage.py", line 9, in <module>
    execute_from_command_line(sys.argv)
File "/lib/python3.4/site-packages/django/core/management/__init__.py", line 338, in execute_from_command_line
    utility.execute()
File "/lib/python3.4/site-packages/django/core/management/__init__.py", line 330, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
File "/python3.4/site-packages/django/core/management/base.py", line 393, in run_from_argv
    self.execute(*args, **cmd_options)
File "/lib/python3.4/site-packages/django/core/management/base.py", line 444, in execute
    output = self.handle(*args, **options)
File "/lib/python3.4/site-packages/django/core/management/commands/migrate.py", line 207, in handle
    changes = autodetector.changes(graph=executor.loader.graph)
File "//lib/python3.4/site-packages/django/db/migrations/autodetector.py", line 43, in changes
    changes = self._detect_changes(convert_apps, graph)
File "/lib/python3.4/site-packages/django/db/migrations/autodetector.py", line 170, in _detect_changes
    old_field.rel.through._meta.model_name,
AttributeError: '_Meta' object has no attribute 'model_name'