Django 执行 makemigrations 显示 No changes detected in app

在django项目配置一下多数据库，但是运行 makemigrations 执行不正常

$ python manage.py makemigrations polls
no changes detected in app 'polls'

 

models.py 代码：

class question(models.model):
    question_text = models.charfield(max_length=200)
    pub_date = models.datetimefield('date published')

    class meta:
        app_label = 'apps.polls'

 

删除 class meta，执行成功了。

$ python manage.py makemigrations polls
migrations for 'polls':
  apps\polls\migrations\0001_initial.py
    - create model question

然后执行 python manage.py migrate polls --database=app_db_name，数据库只产生了django_migrations， 没有生成对应的表

调整setting.py

database_apps_mapping = {
    # 'apps.polls': 'db_name',
    'polls': 'db_name',
}

class question(models.model):
    question_text = models.charfield(max_length=200)
    pub_date = models.datetimefield('date published')

    class meta:
        app_label = 'polls'

　重新执行 makemigrations 和 migrate, 数据库存成功生成数据表  polls_question。