django.db.utils.OperationalError: (1071, 'Specified key was too long; max key length is 1000 bytes')

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说明:

python manage.py makemigrations -- 正常

python manage.py migrate -- 报错

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 > 调试发现, model文件的 max_length 有1024的字段
        修改为 1000 --> 还是报错  
        修改为 255 --> 还是报错
        修改为 200 ---> 正常了

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