Migration to rename an ActiveRecord model and its table in Rails

In Rails 3.1+ ActiveRecord::Migration::CommandRecorder knows how to reverse rename_table migrations, so you can do this:

class RenameOldTableToNewTable< ActiveRecord:Migration
    def change
        rename_table :old_table_name, :new_table_name
    end 
 end

You need to rename the model declaration files manually.