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class AddMissingIndexesToMessages < ActiveRecord::Migration[4.2] def self.up add_index :messages, :last_reply_id add_index :messages, :author_id end def self.down remove_index :messages, :last_reply_id remove_index :messages, :author_id end end r/testdata/visitor.typepatterns.txt?h=master' type='application/atom+xml'/>