我可以添加包含擴展到belongs_to關聯嗎？

Question

我很難得到一個belongs_to協會，以加載它的孩子。我有：

class User < ActiveRecord::Base 
    has_many :campaigns, -> { includes :campaign_shirts, :arts, :selected_campaign_shirt } 
    belongs_to :selected_campaign, {class_name: "Campaign", inverse_of: :user}, -> { includes :campaign_shirts, :arts, :selected_campaign_shirt } 
end 

導致：

// GOOD 
u.campaigns.first.campaign_shirts.first.to_s 
=> "#<CampaignShirt:0x007fc023a9abb0>" 
u.campaigns.first.campaign_shirts.first.to_s 
=> "#<CampaignShirt:0x007fc023a9abb0>" 

// NOT GOOD 
u.selected_campaign.campaign_shirts.first.to_s 
(queries db) 
=> "#<CampaignShirt:0x007fc023d7c630>" 
(queries db) 
u.selected_campaign.campaign_shirts.first.to_s 
=> "#<CampaignShirt:0x007fc01af528a0>" 

我是否相抵觸的this issue運行？有沒有辦法實現我想要的，這是能夠參考current_user.selected_campaign，並有急切加載/凍結current_user.selected_campaign.campaign_shirts.first等？

Answer 1

嘗試將拉姆達範圍之前其他關聯選項喜歡如下：

# app/models/users.rb 

belongs_to :selected_campaign, -> { includes :campaign_shirts, :arts, :selected_campaign_shirt }, {class_name: "Campaign", inverse_of: :user},