mastodon/db/migrate/20170112154826_migrate_settings.rb

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# frozen_string_literal: true
class MigrateSettings < ActiveRecord::Migration[4.2]
def up
change_table(:settings, bulk: true) do |t|
t.remove_index [:target_type, :target_id, :var]
t.rename :target_id, :thing_id
t.rename :target_type, :thing_type
t.change :thing_id, :integer, null: true, default: nil
t.change :thing_type, :string, null: true, default: nil
t.index [:thing_type, :thing_id, :var], unique: true
end
end
def down
change_table(:settings, bulk: true) do |t|
t.remove_index [:thing_type, :thing_id, :var]
t.rename :thing_id, :target_id
t.rename :thing_type, :target_type
t.column :target_id, :integer, null: false
t.column :target_type, :string, null: false, default: ''
t.index [:target_type, :target_id, :var], unique: true
end
end
end