Python 摇尾误差models.py中的new models.CharField

我希望你们都好：）你能帮我一下吗。我是初学者。我正在用python发布一个新网站，我选择wagtail作为CMS。我想更改每个博客页面的模式，以便获得更多信息。但我遇到了一些问题：（

这段代码（blog/models.py）一切正常：

但当我尝试添加一个新的领域“炊具”时，比如

cooker = models.CharField(max_length=250)

第一个stel可以：

(monProjetWagtail:3.7)[dulo0814@louisiane monProjetWagtail]$ python manage.py makemigrations
Migrations for 'blog':
  blog/migrations/0018_auto_20200522_1106.py
    - Remove field autobio from blogpage
    - Add field cooker to blogpage

第二步不行：（

（monProjetWagtail:3.7）[dulo0814@louisianemonProjetWagtail]$python manage.py迁移
系统检查发现了一些问题：
警告:
？：（mysql.W002）数据库连接“默认”未设置mysql严格模式
提示：MySQL的严格模式通过将警告升级为错误来修复MySQL中的许多数据完整性问题，如插入时的数据截断。强烈建议您激活它。请参阅：https://docs.djangoproject.com/en/3.0/ref/databases/#mysql-sql模式
要执行的操作：
应用所有迁移：admin、auth、blog、contenttypes、home、sessions、taggit、wagtailadmin、wagtailcore、wagtaildocs、wagtailmbeds、wagtailforms、wagtailmages、wagtailredirects、wagtailsearch、wagtailusers
运行迁移：
正在应用blog.0013\u blogpage\u autopost…回溯（最近一次调用）：
文件“manage.py”，第10行，在
从命令行（sys.argv）执行命令
文件“/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site packages/django/core/management/_init_uuuu.py”，第401行，从命令行执行
utility.execute（）
文件“/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site packages/django/core/management/_init__.py”，第395行，执行
self.fetch_命令（子命令）。从_argv（self.argv）运行_
文件“/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site-packages/django/core/management/base.py”，第328行，运行于
self.execute（*args，**cmd_选项）
文件“/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site packages/django/core/management/base.py”，第369行，在execute中
输出=self.handle（*args，**选项）
文件“/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site packages/django/core/management/base.py”，第83行，包装
res=句柄函数（*args，**kwargs）
文件“/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site packages/django/core/management/commands/migrate.py”，第233行，在handle中
假首字母=假首字母，
文件“/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site packages/django/db/migrations/executor.py”，第117行，inmigrate
状态=self.\u迁移\u所有\u转发（状态，计划，完整计划，假=假，假首字母=假首字母）
文件“/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site packages/django/db/migrations/executor.py”，第147行，全部向前迁移
state=self.apply\u迁移（state，migration，false=false，false\u initial=false\u initial）
文件“/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site packages/django/db/migrations/executor.py”，第245行，不适用于迁移
state=migration.apply（状态，模式编辑器）
文件“/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site packages/django/db/migrations/migration.py”，第124行，适用于
操作。数据库转发（self.app\u标签、模式编辑器、旧状态、项目状态）
文件“/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site packages/django/db/migrations/operations/fields.py”，第112行，在数据库中
领域
文件“/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site packages/django/db/backends/mysql/schema.py”，第80行，在add_字段中
super（）.添加_字段（模型，字段）
文件“/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site packages/django/db/backends/base/schema.py”，第450行，在add_字段中
定义，params=self.column\u sql（模型，字段，include\u默认值=True）
文件“/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site packages/django/db/backends/base/schema.py”，第223行，在sql列中
默认值=自生效默认值（字段）
文件“/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site packages/django/db/backends/base/schema.py”，第303行，默认有效
返回字段.get\u db\u prep\u save（self.\u effective\u default（字段），self.connection）
文件“/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site packages/django/db/models/fields/________.py”，第821行，在get_db_prep_save中
返回self.get_db_prep_值（值，connection=connection，prepared=False）
文件“/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site packages/django/db/models/fields/____初始__.py”，第816行，在get_db_prep_值中
value=self.get\u prep\u值（value）
文件“/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site packages/wagtail/core/fields.py”，第111行，在get_prep_值中
返回json.dumps（self.stream\u block.get\u prep\u value（value），cls=DjangoJSONEncoder）
文件“/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site packages/wagtail/core/blocks/stream_block.py”，第260行，在get_prep_值中
返回值。get_prep_value（）
AttributeError:'datetime.datetime'对象没有属性'get\u prep\u value'
（monProjetWagtail:3.7）[dulo0814@louisianemonProjetWagtail]$

有人能帮我吗

---

Ps:I'm french

错误消息显示错误出现在迁移

0013_blogpage_autopost

，而不是刚刚创建的

0018_auto_20200522_1106

迁移上。可能在每次

makemigrations

步骤之后您都没有运行

/manage.py migrate

（或者您以前会看到此错误）

错误是指一个StreamField-看起来您有一个datetime对象，其中应该有一个块。由于您的模型中现在没有任何StreamFields，我猜这是一个您添加并随后删除的字段（但它是

(monProjetWagtail:3.7)[dulo0814@louisiane monProjetWagtail]$ python manage.py makemigrations
Migrations for 'blog':
  blog/migrations/0018_auto_20200522_1106.py
    - Remove field autobio from blogpage
    - Add field cooker to blogpage

(monProjetWagtail:3.7)[dulo0814@louisiane monProjetWagtail]$ python manage.py migrate
System check identified some issues:

WARNINGS:
?: (mysql.W002) MySQL Strict Mode is not set for database connection 'default'
        HINT: MySQL's Strict Mode fixes many data integrity problems in MySQL, such as data truncation upon insertion, by escalating warnings into errors. It is strongly recommended you activate it. See: https://docs.djangoproject.com/en/3.0/ref/databases/#mysql-sql-mode
Operations to perform:
  Apply all migrations: admin, auth, blog, contenttypes, home, sessions, taggit, wagtailadmin, wagtailcore, wagtaildocs, wagtailembeds, wagtailforms, wagtailimages, wagtailredirects, wagtailsearch, wagtailusers
Running migrations:
  Applying blog.0013_blogpage_autorpost...Traceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site-packages/django/core/management/__init__.py", line 401, in execute_from_command_line
    utility.execute()
  File "/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site-packages/django/core/management/__init__.py", line 395, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site-packages/django/core/management/base.py", line 328, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site-packages/django/core/management/base.py", line 369, in execute
    output = self.handle(*args, **options)
  File "/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site-packages/django/core/management/base.py", line 83, in wrapped
    res = handle_func(*args, **kwargs)
  File "/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site-packages/django/core/management/commands/migrate.py", line 233, in handle
    fake_initial=fake_initial,
  File "/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site-packages/django/db/migrations/executor.py", line 117, inmigrate
    state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, fake_initial=fake_initial)
  File "/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site-packages/django/db/migrations/executor.py", line 147, in_migrate_all_forwards
    state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)
  File "/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site-packages/django/db/migrations/executor.py", line 245, inapply_migration
    state = migration.apply(state, schema_editor)
  File "/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site-packages/django/db/migrations/migration.py", line 124, in apply
    operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
  File "/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site-packages/django/db/migrations/operations/fields.py", line 112, in database_forwards
    field,
  File "/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site-packages/django/db/backends/mysql/schema.py", line 80, in add_field
    super().add_field(model, field)
  File "/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site-packages/django/db/backends/base/schema.py", line 450, in add_field
    definition, params = self.column_sql(model, field, include_default=True)
  File "/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site-packages/django/db/backends/base/schema.py", line 223, in column_sql
    default_value = self.effective_default(field)
  File "/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site-packages/django/db/backends/base/schema.py", line 303, in effective_default
    return field.get_db_prep_save(self._effective_default(field), self.connection)
  File "/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site-packages/django/db/models/fields/__init__.py", line 821,in get_db_prep_save
    return self.get_db_prep_value(value, connection=connection, prepared=False)
  File "/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site-packages/django/db/models/fields/__init__.py", line 816,in get_db_prep_value
    value = self.get_prep_value(value)
  File "/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site-packages/wagtail/core/fields.py", line 111, in get_prep_value
    return json.dumps(self.stream_block.get_prep_value(value), cls=DjangoJSONEncoder)
  File "/home/dulo0814/virtualenv/monProjetWagtail/3.7/lib/python3.7/site-packages/wagtail/core/blocks/stream_block.py", line 260,in get_prep_value
    return value.get_prep_value()
AttributeError: 'datetime.datetime' object has no attribute 'get_prep_value'
(monProjetWagtail:3.7)[dulo0814@louisiane monProjetWagtail]$