python3 manage.py 即使从模型中删除字段，迁移也会给出有关字段的错误 class

Question

每次我运行 python3 manage.py migrate 我都会得到关于模型 class 中的一个字段的相同错误。即使删除该字段，也会出现同样的错误。

这是模型 class 的样子：

class Events(models.Model):
    name = models.CharField(max_length=200, null=True)
    date = models.DateTimeField(editable=True, null=True)
    sport = models.CharField(max_length=200, null=True)
    location = models.CharField(max_length=200, null=True)
    description = models.CharField(max_length=200, null=True, blank=True)
    date_created = models.DateTimeField(auto_now_add=True)
    tags = models.ManyToManyField(Tag)
    num_seats = models.IntegerField(null=True, blank=True)
    creator = models.CharField(max_length=200, null=False)

这是错误的样子：

TypeError: int() argument must be a string, a bytes-like object or a real number, not 'IntegerField'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/Users/laithtahboub/Desktop/Programming/Django/events_project/manage.py", line 22, in <module>
    main()
  File "/Users/laithtahboub/Desktop/Programming/Django/events_project/manage.py", line 18, in main
    execute_from_command_line(sys.argv)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/django/core/management/__init__.py", line 425, in execute_from_command_line
    utility.execute()
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/django/core/management/__init__.py", line 419, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/django/core/management/base.py", line 373, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/django/core/management/base.py", line 417, in execute
    output = self.handle(*args, **options)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/django/core/management/base.py", line 90, in wrapped
    res = handle_func(*args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/django/core/management/commands/migrate.py", line 253, in handle
    post_migrate_state = executor.migrate(
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/django/db/migrations/executor.py", line 126, in migrate
    state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, fake_initial=fake_initial)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/django/db/migrations/executor.py", line 156, in _migrate_all_forwards
    state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/django/db/migrations/executor.py", line 236, in apply_migration
    state = migration.apply(state, schema_editor)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/django/db/migrations/migration.py", line 125, in apply
    operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/django/db/migrations/operations/fields.py", line 225, in database_forwards
    schema_editor.alter_field(from_model, from_field, to_field)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/django/db/backends/sqlite3/schema.py", line 140, in alter_field
    super().alter_field(model, old_field, new_field, strict=strict)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/django/db/backends/base/schema.py", line 618, in alter_field
    self._alter_field(model, old_field, new_field, old_type, new_type,
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/django/db/backends/sqlite3/schema.py", line 362, in _alter_field
    self._remake_table(model, alter_field=(old_field, new_field))
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/django/db/backends/sqlite3/schema.py", line 202, in _remake_table
    'default': self.quote_value(self.effective_default(new_field))
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/django/db/backends/base/schema.py", line 334, in effective_default
    return field.get_db_prep_save(self._effective_default(field), self.connection)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/django/db/models/fields/__init__.py", line 839, in get_db_prep_save
    return self.get_db_prep_value(value, connection=connection, prepared=False)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/django/db/models/fields/__init__.py", line 834, in get_db_prep_value
    value = self.get_prep_value(value)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/django/db/models/fields/__init__.py", line 1824, in get_prep_value
    raise e.__class__(
TypeError: Field 'num_seats' expected a number but got <django.db.models.fields.IntegerField>.

如果您需要查看其他文件以确定问题，请告诉我。我知道 Stack Overflow 上有很多与此类似的问题，但请记住，我已经根据这些问题的答案尝试了几乎所有可能的方法，但还没有任何效果。

Answer 1

从模型class中删除字段后，需要在运行python manage.py migrate

之前运行python manage.py makemigrations

因此，通过删除迁移文件夹中除 __init__.py 文件之外的所有文件来解决问题。并从 django_migrations table 中删除所有行 re-applying python manage.py migrate --fake

的假迁移

这解决了问题。（OP 和我打电话来解决问题）

python3 manage.py 即使从模型中删除字段，迁移也会给出有关字段的错误 class

python3 manage.py migrate gives error about field even when it is deleted from the model class

python

sqlite

django