migration between versions


how to migrate in between versions ?
suppose if i have version 1-76 .

if i want to revert from 57-65 then what should i do ?without affecting
data of migrations from 66-76.Please help


'rake db:migrate VERSION=x' (where 'x' is the migration number)

I'm not sure if it is possible to do what you want using rake. Generally
speaking in the development environment, while data loss can be inconvenient
the data is rarely considered to be crucial - the critical data is what is
used in the production environment.

If you really do have to save what you have in the tables that would be
lost, you can backup the data from the database and then restore it once
rake recreates the empty tables. The method to do this depends on which
database platform you are using, with MySQL for example you would use