donphan/db/migrate/20170507141759_optimize_ind...

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class OptimizeIndexSubscriptions < ActiveRecord::Migration[5.0]
def up
add_index :subscriptions, [:account_id, :callback_url], unique: true
remove_index :subscriptions, [:callback_url, :account_id]
end
def down
add_index :subscriptions, [:callback_url, :account_id], unique: true
remove_index :subscriptions, [:account_id, :callback_url]
end
end