Change data in DB before migrating

[sebasti...@gmail.com]

Hallo,

sometimes it exists the problem that i change a field to another fieldtype then i want for example to move existing data in column to another column before migration of this field are running. Is there a possibility to execute a script before a field through migration are running?

Regards

[David Nugent]

Yes, this is certainly possible.

Migrations are just python scripts that follow a specific protocol/api that is detailed in the excellent django documentation. You can insert your own hand crafted migrations to handle many cases that can cater for a variety of use cases.

i would suggest though an alternative and easier approach. add a new field with a different name and change your code accordingly. once the current field is no longer of use, remove it.

HTH

/d

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