require "granite"

module MW
  module Db
    class TeacherVote < Granite::Base
      table teacher_votes

      belongs_to :vote
      belongs_to :teacher

      column id : Int64, primary: true
      column priority : Int32

      validate :teacher, "must be present" do |teacher_vote|
        !teacher_vote.teacher.nil?
      end

      validate :teacher, "must be student unique" do |teacher_vote|
        self.where(vote_id: teacher_vote.vote.id, teacher_id: teacher_vote.teacher.not_nil!.id).count == 0
      end

      validate :priority, "must be greater than 0" do |teacher_vote|
        teacher_vote.priority > 0
      end

      validate :priority, "must be less than the number of teachers" do |teacher_vote|
        teacher_vote.priority < Teacher.count
      end
    end
  end
end