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PONot sure why django South is trying to run reverse migration
 

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  1. PONot sure why django South is trying to run reverse migration
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    <p>When I run <code>python manage.py migrate api</code> it fails with "RuntimeError: Cannot reverse this migration."</p> <p>The problem is, I'm not sure why it would even be trying to run a reverse migration? The file its failing on is 0025, which isn't mentioned in the <code>south_migrationhistory</code> table in the MySQL database.</p> <p>Any ideas why South would be trying to run a reverse migration with this command?</p> <p>Thanks!</p> <p>EDIT:</p> <p>The full stack trace is:</p> <pre><code>Running migrations for api: - Migrating forwards to 0026_auto. &gt; api:0025_auto__chg_field_article_curator_response_comment__chg_field_article_cu Traceback (most recent call last): File "manage.py", line 14, in &lt;module&gt; execute_manager(settings) File "/home/ubuntu/fake-env/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 459, in execute_manager utility.execute() File "/home/ubuntu/fake-env/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 382, in execute self.fetch_command(subcommand).run_from_argv(self.argv) File "/home/ubuntu/fake-env/local/lib/python2.7/site-packages/django/core/management/base.py", line 196, in run_from_argv self.execute(*args, **options.__dict__) File "/home/ubuntu/fake-env/local/lib/python2.7/site-packages/django/core/management/base.py", line 232, in execute output = self.handle(*args, **options) File "/home/ubuntu/fake-env/local/lib/python2.7/site-packages/south/management/commands/migrate.py", line 105, in handle ignore_ghosts = ignore_ghosts, File "/home/ubuntu/fake-env/local/lib/python2.7/site-packages/south/migration/__init__.py", line 191, in migrate_app success = migrator.migrate_many(target, workplan, database) File "/home/ubuntu/fake-env/local/lib/python2.7/site-packages/south/migration/migrators.py", line 221, in migrate_many result = migrator.__class__.migrate_many(migrator, target, migrations, database) File "/home/ubuntu/fake-env/local/lib/python2.7/site-packages/south/migration/migrators.py", line 292, in migrate_many result = self.migrate(migration, database) File "/home/ubuntu/fake-env/local/lib/python2.7/site-packages/south/migration/migrators.py", line 125, in migrate result = self.run(migration) File "/home/ubuntu/fake-env/local/lib/python2.7/site-packages/south/migration/migrators.py", line 99, in run return self.run_migration(migration) File "/home/ubuntu/fake-env/local/lib/python2.7/site-packages/south/migration/migrators.py", line 86, in run_migration print self.run_migration_error(migration) File "/home/ubuntu/fake-env/local/lib/python2.7/site-packages/south/migration/migrators.py", line 286, in run_migration_error (self.format_backwards(migration), extra_info)) File "/home/ubuntu/fake-env/local/lib/python2.7/site-packages/south/migration/migrators.py", line 273, in format_backwards self.backwards(migration)() File "/home/ubuntu/fake-env/local/lib/python2.7/site-packages/south/migration/migrators.py", line 57, in &lt;lambda&gt; return (lambda: direction(orm)) File "/home/ubuntu/fakeapi/fakeapi/../fakeapi/api/migrations/0025_auto__chg_field_article_curator_response_comment__chg_field_article_cu.py", line 42, in backwards raise RuntimeError("Cannot reverse this migration. 'Image.article' and its values cannot be restored.") RuntimeError: Cannot reverse this migration. 'Image.article' and its values cannot be restored. </code></pre>
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    1. PTQuestion
    1. USdjs22
    1. USdjs22
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      1. PONot sure why django South is trying to run reverse migration
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      1. VTUpMod
    1. COIs that the only error you get, or is there more detail? You might have hit an error that it then attempted to rollback - but you're only seeing the rollback error.
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      1. USSteve Mayne
    2. COI'm pretty sure that's the only relevant information, I've added the full stack trace just in case
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      1. PONot sure why django South is trying to run reverse migration
      1. USdjs22
    3. COI believe it is doing a check to verify that it is possible to reverse the migration. And since it is not possible throws the error. If you are missing a migration, that would prevent reverse migrations. Just a thought.
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      1. PONot sure why django South is trying to run reverse migration
      1. USmtnpaul
 

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