Question

我有一个带有外键字段的模型。我想给外键一个相关的名字。但是，由于以下错误，迁移失败：

IndexError: list index out of range

我正在使用Django == 1.10.5
数据库后端是PostgreSQL

models.py迁移之前/之后

之前：

class Contest_participants(models.Model):
    contest = models.ForeignKey(Contest)

后：

 class Contest_participants(models.Model):
     contest = models.ForeignKey(Contest, related_name='contests')

makemigrations命令工作正常，但migrate命令因上述错误而失败。

完成回溯错误：

Running migrations:
  Applying teams.0013_auto_20171031_1225...Traceback (most recent call last):
File "manage.py", line 19, in <module>
    execute_from_command_line(sys.argv)
  File "/home/aps/Documents/neuron/venv/lib/python3.5/site-packages/django/core/management/__init__.py", line 367, in execute_from_command_line
    utility.execute()
  File "/home/aps/Documents/neuron/venv/lib/python3.5/site-packages/django/core/management/__init__.py", line 359, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/aps/Documents/neuron/venv/lib/python3.5/site-packages/django/core/management/base.py", line 294, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/home/aps/Documents/neuron/venv/lib/python3.5/site-packages/django/core/management/base.py", line 345, in execute
    output = self.handle(*args, **options)
  File "/home/aps/Documents/neuron/venv/lib/python3.5/site-packages/django/core/management/commands/migrate.py", line 204, in handle
    fake_initial=fake_initial,
  File "/home/aps/Documents/neuron/venv/lib/python3.5/site-packages/django/db/migrations/executor.py", line 115, in migrate
    state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, fake_initial=fake_initial)
  File "/home/aps/Documents/neuron/venv/lib/python3.5/site-packages/django/db/migrations/executor.py", line 145, in _migrate_all_forwards
    state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)
  File "/home/aps/Documents/neuron/venv/lib/python3.5/site-packages/django/db/migrations/executor.py", line 244, in apply_migration
    state = migration.apply(state, schema_editor)
  File "/home/aps/Documents/neuron/venv/lib/python3.5/site-packages/django/db/migrations/migration.py", line 129, in apply
    operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
  File "/home/aps/Documents/neuron/venv/lib/python3.5/site-packages/django/db/migrations/operations/fields.py", line 204, in database_forwards
    schema_editor.alter_field(from_model, from_field, to_field)
  File "/home/aps/Documents/neuron/venv/lib/python3.5/site-packages/django/db/backends/base/schema.py", line 495, in alter_field
    old_db_params, new_db_params, strict)
  File "/home/aps/Documents/neuron/venv/lib/python3.5/site-packages/django/db/backends/postgresql/schema.py", line 117, in _alter_field
    new_db_params, strict,
  File "/home/aps/Documents/neuron/venv/lib/python3.5/site-packages/django/db/backends/base/schema.py", line 504, in _alter_field
    fk_names = self._constraint_names(model, [old_field.column], foreign_key=True)
  File "/home/aps/Documents/neuron/venv/lib/python3.5/site-packages/django/db/backends/base/schema.py", line 931, in _constraint_names
    constraints = self.connection.introspection.get_constraints(cursor, model._meta.db_table)
  File "/home/aps/Documents/neuron/venv/lib/python3.5/site-packages/django/db/backends/postgresql/introspection.py", line 178, in get_constraints
    "foreign_key": tuple(used_cols[0].split(".", 1)) if kind.lower() == "foreign key" else None,
IndexError: list index out of range

编辑：迁移

class Migration(migrations.Migration):

    dependencies = [
        ('teams', '0012_auto_20170904_1524'),
    ]

    operations = [
        migrations.AlterField(
            model_name='contest_participants',
            name='contest',
            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='contests', to='contest.Contest'),
        ),
    ]

Django migrate命令失败，更改了外键相关名称

0 个答案: