看起来像您
null=True在创建迁移文件后添加的。因为
venue_city您的迁移文件中的字段不是可为空的字段
跟着这些步骤。
1) Drop venue_city & venue_country from your local table3) Delete all the migration files you created for these `CharField to a ForeignKey` change4) execute `python manage.py makemigrations`5) execute 'python manage.py migrate'
它应该工作
