User destroy

users.rb

#######################################################################
failed_list = []
user_ids_with_enrollment = Enrollment.pluck(:user_id)

users_without_enrollment = User.where.not(id: user_ids_with_enrollment)
users_without_enrollment.find_each do |user|  
  failed_list << user.id unless user.destroy
end

p "Total users to delete: #{user_without_enrollment.length}"
p "Total users that not deleted: #{failed_list.length}"

#########################################
# Debug failed reason from list of failed
failed_list.each do |user_id|
  begin 
    user = User.find_by(id: user_id)
    user.destroy!
  rescue Exception => ex
    p "#{user_id}: => #{ex.message}"
  end
end