即使 makemigrations 命令似乎检测到字段中的更改，也从旧迁移中获取 ValueError

Question

我正在尝试在我的字段中进行此更改以正确更新，以便我可以处理项目的其余部分。这是当前导致问题的模型：

class Hotel(models.Model):
    name = models.CharField(max_length=255)
    address = models.CharField(max_length=255)
    check_in_date = models.DateField()
    check_out_date = models.DateField()
    notes = models.TextField(blank=True)
    id = models.AutoField(primary_key=True)
    people = models.CharField(max_length=255)

    # the people field is the issue rn

    def __str__(self):
        return self.name + ", " + str(self.id)

以前，people 字段是 ArrayField，但我将其更改为 CharField，因为它不需要是数组。

这是迁移 7，我将 people 字段添加为 ArrayField

class Migration(migrations.Migration):

    dependencies = [
        ('project_name', '0006_confirmationentry_alter_hotel_notes'),
    ]

    operations = [
        migrations.AddField(
            model_name='hotel',
            name='people',
            field=django.contrib.postgres.fields.ArrayField(base_field=models.IntegerField(), default=list, size=None),
        ),
    ]

这是迁移 8，我将其更改为 CharField

class Migration(migrations.Migration):

    dependencies = [
        ('project_name', '0007_hotel_people'),
    ]

    operations = [
        migrations.AlterField(
            model_name='hotel',
            name='people',
            field=models.CharField(max_length=255),
        ),
    ]

我已经多次删除/注释了人员字段并将其放回去，当我这样做时

python3 manage.py makemigrations

，这些更改会被检测到。但是当我这样做时

python3 manage.py migrate

它给了我这个错误：

  Applying project_name.0007_hotel_people...Traceback (most recent call last):
  File "/Users/me/Desktop/project_name/manage.py", line 22, in <module>
    execute_from_command_line(sys.argv)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/django/core/management/__init__.py", line 446, in execute_from_command_line
    utility.execute()
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/django/core/management/__init__.py", line 440, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/django/core/management/base.py", line 414, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/django/core/management/base.py", line 460, in execute
    output = self.handle(*args, **options)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/django/core/management/base.py", line 98, in wrapped
    res = handle_func(*args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/django/core/management/commands/migrate.py", line 290, in handle
    post_migrate_state = executor.migrate(
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/django/db/migrations/executor.py", line 131, in migrate
    state = self._migrate_all_forwards(
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/django/db/migrations/executor.py", line 163, in _migrate_all_forwards
    state = self.apply_migration(
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/django/db/migrations/executor.py", line 248, in apply_migration
    state = migration.apply(state, schema_editor)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/django/db/migrations/migration.py", line 131, in apply
    operation.database_forwards(
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/django/db/migrations/operations/fields.py", line 108, in database_forwards
    schema_editor.add_field(
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/django/db/backends/sqlite3/schema.py", line 381, in add_field
    self._remake_table(model, create_field=field)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/django/db/backends/sqlite3/schema.py", line 229, in _remake_table
    mapping[create_field.column] = self.quote_value(
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/django/db/backends/sqlite3/schema.py", line 68, in quote_value
    raise ValueError(
ValueError: Cannot quote parameter value [] of type <class 'list'>

我觉得这可能是由于 postgres 和 sqlite 在某处发生冲突造成的，但如果是这样，我不知道如何向软件表明我坚持使用 sqlite。我知道 ArrayField 是 postgres 的一部分，而不是 sqlite，所以希望这是一个开始

Answer 1

如果其他人也遇到类似的问题，我已经用一种非常简单的方式解决了这个问题。注释掉模型中的所有代码以及整个代码中模型的每个实例。做了

python3 manage.py makemigrations

和

python3 manage.py migrate

。然后我取消所有注释并再次运行这些命令