ruby on rails - 2 way delete relationship -

i have user_relations table.

user_id | related_user_id -------------------------   1     | 15   1     | 17   4     | 56  15     |  1   5     | 34 

when destroy row (1 | 15), want rails automatically delete parallel row (15 | 1).

is there rails way of doing this?

this user_relation class:

class userrelation < activerecord::base   belongs_to :user, :class_name => "user", :foreign_key => "user_id"   belongs_to :related_user, :class_name => "user", :foreign_key => "related_user_id" end 

yes, can write filter in userrelation model,

after_destroy :delete_associated   def delete_associated   ur = userrelations.find_by_related_user_id_and_user_id(related_user_id, user_id)  ur.delete if ur end 

update:

to create associated record can write filter this,

 after_create :create_associated  def create_associated    userrelations.find_or_create_by_related_user_id_and_user_id(related_user_id, user_id) #check if exist or create new  end