removed hasmany association from users

app/models/user.rb

@@ -135,7 +135,6 @@ class User < ActiveRecord::Base
   has_many :issue_assignees
   has_many :assigned_issues, class_name: "Issue", through: :issue_assignees, source: :issue
   has_many :assigned_merge_requests,  dependent: :nullify, foreign_key: :assignee_id, class_name: "MergeRequest" # rubocop:disable Cop/ActiveRecordDependent
-  has_many :closed_issues, class_name: 'Issue', dependent: :nullify, foreign_key: :closed_by_id
 
   has_many :custom_attributes, class_name: 'UserCustomAttribute'
   has_many :callouts, class_name: 'UserCallout'