In 1.7 auto-created migration with makemigrations. it contains:
related_name=b''
Now in 1.8 while migrate, django tries Render model state and fails with:
File
"/home/vladislav/.virtualenvs/furskru/local/lib/python2.7/site-packages/django/core/management/__init__.py",
line 338, in execute_from_command_line
utility.execute()
File
"/home/vladislav/.virtualenvs/furskru/local/lib/python2.7/site-packages/django/core/management/__init__.py",
line 330, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File
"/home/vladislav/.virtualenvs/furskru/local/lib/python2.7/site-packages/django/core/management/base.py",
line 390, in run_from_argv
self.execute(*args, **cmd_options)
File
"/home/vladislav/.virtualenvs/furskru/local/lib/python2.7/site-packages/django/core/management/base.py",
line 441, in execute
output = self.handle(*args, **options)
File
"/home/vladislav/.virtualenvs/furskru/local/lib/python2.7/site-packages/django/core/management/commands/migrate.py",
line 221, in handle
executor.migrate(targets, plan, fake=fake, fake_initial=fake_initial)
File
"/home/vladislav/.virtualenvs/furskru/local/lib/python2.7/site-packages/django/db/migrations/executor.py",
line 104, in migrate
state = migration.mutate_state(state, preserve=do_run)
File
"/home/vladislav/.virtualenvs/furskru/local/lib/python2.7/site-packages/django/db/migrations/migration.py",
line 83, in mutate_state
operation.state_forwards(self.app_label, new_state)
File
"/home/vladislav/.virtualenvs/furskru/local/lib/python2.7/site-packages/django/db/migrations/operations/models.py",
line 158, in state_forwards
apps = state.apps
File
"/home/vladislav/.virtualenvs/furskru/local/lib/python2.7/site-packages/django/utils/functional.py",
line 60, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File
"/home/vladislav/.virtualenvs/furskru/local/lib/python2.7/site-packages/django/db/migrations/state.py",
line 166, in apps
return StateApps(self.real_apps, self.models)
File
"/home/vladislav/.virtualenvs/furskru/local/lib/python2.7/site-packages/django/db/migrations/state.py",
line 232, in __init__
self.render_multiple(list(models.values()) + self.real_models)
File
"/home/vladislav/.virtualenvs/furskru/local/lib/python2.7/site-packages/django/db/migrations/state.py",
line 262, in render_multiple
model.render(self)
File
"/home/vladislav/.virtualenvs/furskru/local/lib/python2.7/site-packages/django/db/migrations/state.py",
line 546, in render
body,
File
"/home/vladislav/.virtualenvs/furskru/local/lib/python2.7/site-packages/django/db/models/base.py",
line 189, in __new__
new_class.add_to_class(obj_name, obj)
File
"/home/vladislav/.virtualenvs/furskru/local/lib/python2.7/site-packages/django/db/models/base.py",
line 324, in add_to_class
value.contribute_to_class(cls, name)
File
"/home/vladislav/.virtualenvs/furskru/local/lib/python2.7/site-packages/django/db/models/fields/related.py",
line 1767, in contribute_to_class
super(ForeignObject, self).contribute_to_class(cls, name,
virtual_only=virtual_only)
File
"/home/vladislav/.virtualenvs/furskru/local/lib/python2.7/site-packages/django/db/models/fields/related.py",
line 305, in contribute_to_class
add_lazy_relation(cls, self, other, resolve_related_class)
File
"/home/vladislav/.virtualenvs/furskru/local/lib/python2.7/site-packages/django/db/models/fields/related.py",
line 86, in add_lazy_relation
operation(field, model, cls)
File
"/home/vladislav/.virtualenvs/furskru/local/lib/python2.7/site-packages/django/db/models/fields/related.py",
line 304, in resolve_related_class
field.do_related_class(model, cls)
File
"/home/vladislav/.virtualenvs/furskru/local/lib/python2.7/site-packages/django/db/models/fields/related.py",
line 349, in do_related_class
self.contribute_to_related_class(other, self.rel)
File
"/home/vladislav/.virtualenvs/furskru/local/lib/python2.7/site-packages/django/db/models/fields/related.py",
line 1958, in contribute_to_related_class
super(ForeignKey, self).contribute_to_related_class(cls, related)
File
"/home/vladislav/.virtualenvs/furskru/local/lib/python2.7/site-packages/django/db/models/fields/related.py",
line 1773, in contribute_to_related_class
if not self.rel.is_hidden() and not related.related_model._meta.swapped:
File
"/home/vladislav/.virtualenvs/furskru/local/lib/python2.7/site-packages/django/db/models/fields/related.py",
line 1355, in is_hidden
return self.related_name is not None and self.related_name[-1] == '+'
IndexError: string index out of range
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