id,summary,reporter,owner,description,type,status,component,version,severity,resolution,keywords,cc,stage,has_patch,needs_docs,needs_tests,needs_better_patch,easy,ui_ux 28073,RemoveField.state_forwards() crashes with AttributeError: 'NoneType' object has no attribute 'is_relation',Logan Gunthorpe,Pallav Parikh,"Hi, I'm trying to upgrade my project (originally created on 1.7) to the latest release but there's an issue with my existing migration files not working. The backtrace is below. I'll attache my migration files but it seems to be related to the migration removing the 'id' field which was automatically created and then removed in a future migration. Commenting out the RemoveField in the second migration seems to fix the issue but I'm not sure if it's entirely correct to do so. Thanks, Logan {{{ Traceback (most recent call last): File ""./manage.py"", line 10, in execute_from_command_line(sys.argv) File ""/home/logang/projects/stove/software/website_dev/env/lib/python3.4/site-packages/django/core/management/__init__.py"", line 363, in execute_from_command_line utility.execute() File ""/home/logang/projects/stove/software/website_dev/env/lib/python3.4/site-packages/django/core/management/__init__.py"", line 355, in execute self.fetch_command(subcommand).run_from_argv(self.argv) File ""/home/logang/projects/stove/software/website_dev/env/lib/python3.4/site-packages/django/core/management/base.py"", line 283, in run_from_argv self.execute(*args, **cmd_options) File ""/home/logang/projects/stove/software/website_dev/env/lib/python3.4/site-packages/django/core/management/base.py"", line 330, in execute output = self.handle(*args, **options) File ""/home/logang/projects/stove/software/website_dev/env/lib/python3.4/site-packages/django/core/management/commands/migrate.py"", line 163, in handle pre_migrate_state = executor._create_project_state(with_applied_migrations=True) File ""/home/logang/projects/stove/software/website_dev/env/lib/python3.4/site-packages/django/db/migrations/executor.py"", line 81, in _create_project_state migration.mutate_state(state, preserve=False) File ""/home/logang/projects/stove/software/website_dev/env/lib/python3.4/site-packages/django/db/migrations/migration.py"", line 92, in mutate_state operation.state_forwards(self.app_label, new_state) File ""/home/logang/projects/stove/software/website_dev/env/lib/python3.4/site-packages/django/db/migrations/operations/fields.py"", line 148, in state_forwards delay = not old_field.is_relation AttributeError: 'NoneType' object has no attribute 'is_relation' }}} ",Bug,closed,Migrations,dev,Normal,wontfix,,,Accepted,0,0,0,0,0,0