employee_comment:
  id: 1
  article: first
  person_id: 1
  person_type: Employee

user_comment_1:
  id: 2
  article: second
  person_id: 1
  person_type: User

user_comment_2:
  id: 3
  article: second
  person_id: 2
  person_type: User
  
user_comment_3:
  id: 4
  article: first
  person_id: 1
  person_type: User1