"how to change primary key in rails migration file?" Code Answer
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you could execute arbitrary sql in your migration:
and then add the new column:
see:
remove primary key in mysql
how to add a primary key to a table in rails
http://thinkwhere.wordpress.com/2009/05/09/adding-a-primary-key-id-to-table-in-rails/
http://api.rubyonrails.org/classes/activerecord/migration.html