zammad/app/models/ticket/priority.rb

# Copyright (C) 2012-2016 Zammad Foundation, http://zammad-foundation.org/
class Ticket::Priority < ApplicationModel
  self.table_name = 'ticket_priorities'
  validates :name, presence: true

  after_create  :ensure_defaults
  after_update  :ensure_defaults
  after_destroy :ensure_defaults

  attr_accessor :callback_loop

  def ensure_defaults
    return if callback_loop
    priorities_with_default = Ticket::Priority.where(default_create: true)
    return if priorities_with_default.count == 1

    if priorities_with_default.count.zero?
      priority = Ticket::Priority.where(active: true).order(id: :asc).first
      priority.default_create = true
      priority.callback_loop = true
      priority.save!
      return
    end

    if priorities_with_default.count > 1
      Ticket::Priority.all.each { |local_priority|
        next if local_priority.id == id
        local_priority.default_create = false
        local_priority.callback_loop = true
        local_priority.save!
      }
    end
  end
end