50 lines
1.7 KiB
Crystal
50 lines
1.7 KiB
Crystal
# Mentorenwahl: A fullstack application for assigning mentors to students based on their whishes.
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# Copyright (C) 2022 Dominic Grimm
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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module Backend
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module Db
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# Teacher vote model
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class TeacherVote < Granite::Base
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table teacher_votes
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belongs_to :vote
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belongs_to :teacher
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# Teacher votes's ID
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column id : Int64, primary: true
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# Teacher vote's priority
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column priority : Int32
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validate :teacher, "must be vote unique" do |teacher_vote|
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self.where(vote_id: teacher_vote.vote.id, teacher_id: teacher_vote.teacher.not_nil!.id).count.run.as(Int64).zero?
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end
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validate :priority, "must be positive" do |teacher_vote|
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teacher_vote.priority >= 0
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end
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validate :priority, "must be less than the number of teachers" do |teacher_vote|
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teacher_vote.priority < Teacher.count
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end
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validate :priority, "must be vote unique" do |teacher_vote|
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self.where(vote_id: teacher_vote.vote.id, priority: teacher_vote.priority).count.run.as(Int64).zero?
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end
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end
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end
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end
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