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RailsのEngineでmigrationを幾分シンプルにする方法

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railsでengineを利用する際に、migrationを実行する場合、

$ rake railties:install:migrations
$ rake db:migrate

RailsGuideだとこのような感じで、
一旦engine側のmigrationファイルをコピーしてから実行するというフローになっているのですが、
正直面倒だったりします。

そこで、rails db:migrate一発で済ます方法がこの記事にある通り。
ただ、これだと rake db:migrate:reset 叩いた時にengine側のmigrationが走ってくれないという問題があり、
最終的に以下に落ち着きました。

module EngineWithMigrations
  class Engine < ::Rails::Engine
    isolate_namespace EngineWithMigrations

    initializer :append_migrations do |app|
      unless app.root.to_s.match root.to_s
        config.paths['db/migrate'].expanded.each do |expanded_path|
          app.config.paths['db/migrate'] << expanded_path
        end
        ActiveRecord::Tasks::DatabaseTasks.migrations_paths = app.config.paths['db/migrate'].to_a # これがないと db:migrate:reset がうまく動かない
      end
    end
  end
end

動作環境: ruby2.3.0, rails4.2.5

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