django models 操作数据库遇到相关问题 Cannot add foreign key constrain

错误信息：

1、django.db.utils.IntegrityError: (1215, u'Cannot add foreign key constraint')

2、RuntimeError: Error creating new content types. Please make sure contenttypes is migrated before trying to migrate apps individually.

3、migrate时后面加auth，报错django.db.utils.ProgrammingError: (1146, u"Table '**.django_site' doesn't exist")
解决办法：
1、删除掉本地migrations文件夹，重新migrations和migrate
2、注释

INSTALLED_APPS下面的home_application(app名称).然后migrations和migrate，之后把home_applications解注释，

再migrations 后面加上 home_application，然后migrate。解决。