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I'm Jason, a web applications developer in the San Francisco Bay area.

Changing Column Order via ActiveRecord Migration

Is it possible to change the order of the columns in your MySQL (or other database) table using a migration? Lets see.

If you check the ActiveRecord::Migration documentation you’ll see there is a method called ‘change_column’ which accepts various options.

<tt>change_column(table_name, column_name, type, options)</tt>:
Changes the column to a different type using the same parameters as add_column

As of Rails 2.3.6 this is now available by using the :after option. You’ll have to include the field type, even though you are not modifying the type.


change_column :orders, :tax_rate, :float, :after => :tax_state