Django South. Миграция баз данных.

Django South Миграция баз данных Николай Ходов [email_address]

С чем его подают? ,[object Object],[object Object],[object Object],[object Object]

Pros & Cons ,[object Object],[object Object],[object Object],[object Object],[object Object]

Как начать? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Переходим к делу сlass Comment До После Поле Тип timestamp DateTimeField headers BaseDictField who ForeignKey text CharField Поле Тип timestamp DateTimeField ip CharField user_agent CharField who ForeignKey text CharField

BaseDictField ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Первая миграция ,[object Object],! Cannot freeze field 'home.comment.headers' ! (this field has class home.fields.BaseDictField) ! South cannot introspect some fields; this is probably because they are custom ! fields. If they worked in 0.6 or below, this is because we have removed the ! models parser (it often broke things). ! To fix this, read http://south.aeracode.org/wiki/MyFieldsDontWork ,[object Object],[object Object],[object Object]

Первая миграция ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Вторая миграция ,[object Object],src/home/models.py: class Comment(models.Model): … ip = models.CharField(max_length= 32 , blank= True ) user_agent = models.CharField(max_length= 256 , blank= True ) + Added field ip on home.Comment + Added field user_agent on home.Comment Created 0002_auto__add_field_comment_ip__add_field_comment_user_agent.py. You can now apply this migration with: ./manage.py migrate home

Третья миграция ,[object Object],Created 0003_headers_to_ip_ua.py. ./src/home/migrations/0003_headers_to_ip_ua.py: class Migration(DataMigration): def forwards( self , orm): for comment in orm[ 'home.Comment' ].objects.all(): comment.ip = comment.headers.REMOTE_ADDR comment.user_agent = comment.headers.HTTP_USER_AGENT comment.save() def backwards( self , orm): # При попытке откатить возникнет исключение raise RuntimeError("Cannot reverse this migration.")

Меняем на сервере ,[object Object],[object Object],[object Object],[object Object]

Разворачиваем с нуля ,[object Object],[object Object],[object Object],[object Object]

Вопросы? Cпасибо за внимание? Презентация http://bit.ly/django-meetup-1203-south Исходники https://github.com/nikolaykhodov/django-meetup-1203-south

Django South. Миграция баз данных.

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Django South. Миграция баз данных.