ruby on rails - Multiple polymorphic relations of same type in one model - MongoID -

i couldn't figure out how work title correctly, let me explain.

i have class like:

class   include mongoid::document   belongs_to :likable, polymorphic: true   belongs_to :user end  class submission   include mongoid::document    belongs_to :creator, class_name: 'user', inverse_of: :submissions   has_many :likes, :as => :likable, :dependent => :destroy end 

then class causes problem:

class user   include mongoid::document   has_many :submissions, :dependent => :destroy    has_many :liked_submissions, :as => :likable, :dependent => :destroy, class_name: 'like'   has_many :liked_comments, :as => :likable, :dependent => :destroy, class_name: 'like' end 

now, problem can't figure out how have both 'liked_comments' , 'liked_comments' in user class. when have above error: ambiguous relations :liked_submissions, :liked_comments defined on user. when trying create submission.

i looked around, , found github issue said may not possible, can't find issue again, , wasn't sure related issue.

is possible, , if not, suggestions getting around it? use likes in blogpost model well, if doesn't work, i'll have find way.

thanks in advance.

i tried , works using mongoid version 4.0.2:

class   include mongoid::document    belongs_to :likable, polymorphic: true   belongs_to :user, inverse_of: :user end  class submission   include mongoid::document    belongs_to :creator, class_name: 'user', inverse_of: :submissions   has_many :likes, as: :likable, dependent: :destroy end  class user   include mongoid::document    has_many :submissions, dependent: :destroy    has_many :likes, as: :user   has_many :liked_submissions, as: :likable, dependent: :destroy, class_name: 'like'   has_many :liked_comments, as: :likable, dependent: :destroy, class_name: 'like' end  class blogpost   include mongoid::document    has_many :likes, as: :likable, dependent: :destroy end 

also user.liked_submissions , user.liked_comments same relation equivalent declaring alias this:

class user   include mongoid::document    has_many :submissions, dependent: :destroy    has_many :likes, as: :user   has_many :liked_submissions, as: :likable, dependent: :destroy, class_name: 'like'    alias :liked_comments :liked_submissions end