如何与current_user加载关联？ [英] How to eager load associations with the current_user?

问题描述

我在Rails应用程序中使用Devise进行身份验证。我想在某些控制器中加载一些与用户相关的模型。这样的东西：

  class TeamsController< ApplicationController 
 
 def show 
 @team = Team.includes（：members）.find params [：id] 
 current_user.includes（：saved_listings）
 
＃正常控制器的东西
 end 
 end 
  

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
end

How 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)
end

Note 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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