How to locate/edit a recurrence in a schedule

[bigbean17]

Hi,

I have a model "Exam", each exam will have a schedule (Montrose::Schedule) which has lots of recurrences. For exam, an exam has a schedule with 2 recurrences:

• from '12-23-2024' to '12-23-2025' at 9:30am every Monday
• from '01-01-2026' to '01-31-2026' at 4:00pm every Sunday

If a user wants to edit the first recurrence, what my code will do is to find which record matches the selected recurrence and remove that record, then create a new one based on the new fields. My code looks like below:

class ExamController
  
  def update
      exam = Exam.find(params[exam_id])
      target_recurrence_index = -1
      exam.schedule.rules.each_with_index do |r, index|
         # compare starts, until, at and on of "r" and "edit_recurrence_param", if all same, set target_recurrence = index
      end
      
      if target_recurrence_index >= 0
        exam.schedule.rules.delete_at(target_recurrence_index)
        edited_recurrence = Montrose::Recurrence.new(edit_recurrence_param)
        exam.schedule << edited_recurrence
      end

  end
  
  private
  
  def edit_recurrence_param
      params.permit(::every, :starts, :until, :at, :on)
  end
end

I think this is a very bad way to do the edition, what could be the best practice to edit a recurrence? Any help would be appreciated!