我该如何实现?
解决方案我遇到同样的问题,虽然大家一直说这是没有必要这样做的,喜欢你。所以这对我有用:
#in application_controller.rb: def current_user @current_user || =超级&& User.includes(:saved_listings).find(@ current_user.id) end注意这将加载所有控制器中的关联。对于我的用例,这正是我需要的。如果你真的只想在一些控制器中,那么你必须再调整一下。
这也将调用 User.find 两次,但是查询缓存不应该是一个问题,并且由于它阻止了一些额外的数据库匹配,它仍然是性能增益。
I'm using Devise for authentication in my Rails app. I'd like to eager load some of a users associated models in some of my controllers. Something like this:
class TeamsController < ApplicationController def show @team = Team.includes(:members).find params[:id] current_user.includes(:saved_listings) # normal controller stuff end endHow can I achieve this?
解决方案I ran into the same issue and although everyone keeps saying there's no need to do this, I found that there is, just like you. So this works for me:
# in application_controller.rb: def current_user @current_user ||= super && User.includes(:saved_listings).find(@current_user.id) endNote that this will load the associations in all controllers. For my use case, that's exactly what I need. If you really want it only in some controllers, you'll have to tweak this some more.
This will also call User.find twice, but with query caching that shouldn't be a problem, and since it prevents a number of additional DB hits, it still is a performance gain.
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