Ruby on rails 有多个：到，：source，：source类型返回空数组

我得到了一些

Manager

和

SoccerTeam

模型。一个经理“拥有”许多足球队；经理也可以评论足球队，也可以评论其他经理：

manager.rb

# Soccer teams the manager owns
has_many :soccer_teams, :dependent => :restrict
# Comments the manager has made on soccer teams or other managers
has_many :reviews, :class_name => "Comment", :foreign_key => :author_id, :dependent => :destroy
# Comments the manager has received by other managers
has_many :comments, :as => :commentable, :dependent => :destroy
# Soccer teams that have received a comment by the manager
has_many :observed_teams, :through => :comments, :source => :commentable, :source_type => "SoccerTeam"

# The manager that owns the team
belongs_to :manager
# Comments received by managers
has_many :comments, :as => :commentable, :dependent => :destroy
# Managers that have reviewed the team
has_many :observers, :through => :comments, :source => :author, :class_name => "Manager"

belongs_to :commentable, :polymorphic => true
belongs_to :author, :class_name => Manager

足球队.rb

# Soccer teams the manager owns
has_many :soccer_teams, :dependent => :restrict
# Comments the manager has made on soccer teams or other managers
has_many :reviews, :class_name => "Comment", :foreign_key => :author_id, :dependent => :destroy
# Comments the manager has received by other managers
has_many :comments, :as => :commentable, :dependent => :destroy
# Soccer teams that have received a comment by the manager
has_many :observed_teams, :through => :comments, :source => :commentable, :source_type => "SoccerTeam"

# The manager that owns the team
belongs_to :manager
# Comments received by managers
has_many :comments, :as => :commentable, :dependent => :destroy
# Managers that have reviewed the team
has_many :observers, :through => :comments, :source => :author, :class_name => "Manager"

belongs_to :commentable, :polymorphic => true
belongs_to :author, :class_name => Manager

comment.rb

# Soccer teams the manager owns
has_many :soccer_teams, :dependent => :restrict
# Comments the manager has made on soccer teams or other managers
has_many :reviews, :class_name => "Comment", :foreign_key => :author_id, :dependent => :destroy
# Comments the manager has received by other managers
has_many :comments, :as => :commentable, :dependent => :destroy
# Soccer teams that have received a comment by the manager
has_many :observed_teams, :through => :comments, :source => :commentable, :source_type => "SoccerTeam"

# The manager that owns the team
belongs_to :manager
# Comments received by managers
has_many :comments, :as => :commentable, :dependent => :destroy
# Managers that have reviewed the team
has_many :observers, :through => :comments, :source => :author, :class_name => "Manager"

belongs_to :commentable, :polymorphic => true
belongs_to :author, :class_name => Manager

现在，如果我有一位经理对SoccerTeam发表评论，我希望能发现：

• manager.reviews

  和

  soccer\u团队中的
  Comment
  对象。comments

• SoccerTeam

  管理者中的对象。观察团队
• 足球队中的

  管理者

  对象。观察员

虽然在第一点和第三点上一切正常，但当我呼叫

经理时，我总是得到一个空数组。要实际获得一位经理评论的足球队名单，我需要使用：

manager.reviews.collect{ |review| Kernel.const_get(review.commentable_type).find(review.commentable_id) if review.commentable_type == "SoccerTeam" }

这很难看。我希望简单的
经理。观察到的团队
能够工作……为什么不能

编辑

我进一步理解了为什么它不起作用。事实上，生成的SQL是：

SELECT "soccer_teams".* FROM "soccer_teams" INNER JOIN "comments" ON "soccer_teams".id = "soccer_teams".commentable_id AND "comments".commentable_type = 'SoccerTeam' WHERE (("comments".commentable_id = 1) AND ("comments".commentable_type = 'Manager'))

虽然我希望它是：

SELECT "soccer_teams".* FROM "soccer_teams" INNER JOIN "comments" ON "soccer_teams".id = "comments".commentable_id AND "comments".commentable_type = 'SoccerTeam' WHERE ("comments".author_id = 1)

所以问题很简单：如何获得该查询？（对
：外键
ans
：as
的启发式尝试，正如预期的那样，并没有解决问题！）
我认为您只是对观察到的
团队使用了错误的关联。而不是

has_many :observed_teams, :through => :comments, 
  :source => :commentable, :source_type => "SoccerTeam"

试试这个：

has_many :observed_teams, :through => :reviews,
 :source => :commentable, :source_type => "SoccerTeam"

也在,

has_many :reviews, :class_name => :comment, 
  :foreign_key => :author_id, :dependent => :destroy

：comment
应该是
“comment”

而且

has_many :comments, :as => commentable, :dependent => :destroy

commmentable
应该是
：commmentable
最后两个是打字错误……但你肯定明白了关联的意义！谢谢