在我的Rails 4应用程序中，我有以下模型：
User
has_many :administrations
has_many :calendars, through: :administrations
has_many :comments
has_many :calendar_comments, through: :calendars, :source => :comments
Calendar
has_many :administrations
has_many :users, through: :administrations
has_many :posts
has_many :comments, through: posts
has_many :ads
Administration
belongs_to :user
belongs_to :calendar
Post
belongs_to :calendar
has_many :comments, as: :commentable
Ad
belongs_to :calendar
has_many :comments, as: :commentable
Comment
belongs_to :commentable, polymorphic: true
belongs_to :user
我需要从comments belong_to ad访问calendar ad belongs_to。{/ p>
这就是我在Calendars#Index行动中尝试做的事情：
@posts_comments = @user.calendar_comments.where(commentable_type: "Post").order("created_at DESC").limit(5)
@ads_comments = @user.calendar_comments.where(commentable_type: "Ad").order("created_at DESC").limit(5)
我的第一个猜测是在日历模型中添加has_many :comments, through: ads：
Calendar
has_many :administrations
has_many :users, through: :administrations
has_many :posts
has_many :comments, through: posts
has_many : ads
has_many :comments, through: ads
但这会取消has_many :comments, through: posts的效果，然后我再也无法从comments {{1}访问belong_to post的{{1}} }} calendar。
有没有办法让 BOTH post 和 belongs_to工作？
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更新：根据this article和that Stack Overflow question，答案可能在于使用has_many :comments, through: posts和has_many :comments, through: ads。
但不确定如何使用它们。
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更新2 ：以下代码是否有意义？
source:- - - -
更新3 ：当我尝试上面的代码时，收到以下错误消息：
source_type:我尝试了以下内容：
class Calendar < ActiveRecord::Base
has_many :administrations, dependent: :destroy
has_many :users, through: :administrations
has_many :posts, dependent: :destroy
has_many :commented_posts, through: :comments, source: :commentable, source_type: 'Post'
has_many :ads, dependent: :destroy
has_many :commented_ads, through: :comments, source: :commentable, source_type: 'Ad'
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更新4 ：使用以下代码尝试新的失败：
Could not find the source association(s) :comments in model Calendar. Try 'has_many :calendar_comments, :through => :calendars, :source => <name>'. Is it one of administrations, users, posts, commented_posts, ads, commented_ads, invites, or pokes?
仍然无效，与上述错误信息相同。
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更新5 ：根据 MrYoshiji 的回答，我现在有了
class Calendar < ActiveRecord::Base
has_many :administrations, dependent: :destroy
has_many :users, through: :administrations
has_many :posts, dependent: :destroy
has_many :calendar_comments, :through => :calendars, :source => :post
has_many :ads, dependent: :destroy
has_many :calendar_comments, :through => :calendars, :source => :ad
现在，class Calendar < ActiveRecord::Base
has_many :administrations, dependent: :destroy
has_many :users, through: :administrations
has_many :posts, dependent: :destroy
has_many :calendar_comments, :through => :commentable, :source => :post
has_many :ads, dependent: :destroy
has_many :calendar_comments, :through => :commentable, :source => :ad
模型中的class Calendar < ActiveRecord::Base
has_many :administrations, dependent: :destroy
has_many :users, through: :administrations
has_many :posts, dependent: :destroy
has_many :posts_comments, through: :posts, source_type: 'Post'
has_many :ads, dependent: :destroy
has_many :ads_comments, through: :ads, source_type: 'Ad'
已不再有效。
我试过了：
has_many :calendar_comments, through: :calendars, :source => :comments仍然无法正常工作。
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更新6 ：我仍然遇到这个问题，因为我无法想办法让以下代码正常工作：
User我尝试了很多不同的东西，到目前为止我能想到的最好的是：
has_many :comments
has_many :calendar_post_comments, through: :calendars, :source => :post_comments
has_many :calendar_ad_comments, through: :calendars, :source => :ad_comments
然后，我按如下方式更新我的日历控制器：
@posts_comments = @user.calendar_comments.where(commentable_type: "Post").order("created_at DESC").limit(5)
@ads_comments = @user.calendar_comments.where(commentable_type: "Ad").order("created_at DESC").limit(5)
但是这会返回以下错误：
class Calendar < ActiveRecord::Base
has_many :administrations, dependent: :destroy
has_many :users, through: :administrations
has_many :posts, dependent: :destroy
has_many :post_comments, through: :posts, source_type: 'Post'
has_many :ads, dependent: :destroy
has_many :ad_comments, through: :ads, source_type: 'Ad'
end
class User < ActiveRecord::Base
has_many :administrations, dependent: :destroy
has_many :calendars, through: :administrations
has_many :comments
has_many :calendar_post_comments, through: :calendars, :source => :post_comments
has_many :calendar_ad_comments, through: :calendars, :source => :ad_comments
end
这里有什么问题？