class CompetitionStaff < ActiveRecord::Base
  default_scope order: 'position asc'

  attr_accessible :minimum, :maximum, :category, :position

  belongs_to :competition

  validates :position, numericality: { only_integer: true }
  validates :minimum, numericality: { only_integer: true, greater_than_or_equal_to: 0 }
  validates :maximum, numericality: { only_integer: true, greater_than_or_equal_to: lambda { |obj| obj.minimum } }
  validates :category, presence: true, inclusion: { in: %w(all teacher student profession) }

  def category_text
    I18n.t("competition_staff.category.#{category}", locale: 'zh')
  end

  def self.category_options
    %w(all teacher student profession).map do |category|
      [I18n.t("competition_staff.category.#{category}", locale: 'zh'), category]
    end
  end
end