ruby-on-rails - Rails 预先加载与选定属性的关联

Question

谁能告诉我是否可以急切加载关联但只返回特定属性？

我想用他们的帐户检索一些订单，但只需要帐户名称。
Order.select([:id, :account_id]).includes(:account).limit(2)

Answer 1

我认为 jvnill 的评论说明了一切:

I'm not sure that is possible. You can however add the account_name to the returned order records.

orders = Order.joins(:account).select('orders.id, orders.account_id, accounts.name AS account_name')

then just use account_name like orders.first.account_name