64 lines
2.2 KiB
Crystal
64 lines
2.2 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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#
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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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#
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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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#
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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 Worker
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module Jobs
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# Assigns students to teachers when all students voted
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class AssignStudentsJob < Mosquito::QueuedJob
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# run_every 1.minute
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def rescheduleable? : Bool
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false
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end
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alias TeacherVote = {student: Int32, priority: Int32}
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alias Assignment = {teacher: Int32, priority: Int32}
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# :ditto:
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def perform : Nil
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teacher_count = Db::Teacher.query.count
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student_count = Db::Student.query.count
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vote_count = Db::Vote.query.count
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if teacher_count == 0
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log "No teachers found, skipping assignment"
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fail
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elsif student_count == 0
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log "No students found, skipping assignment"
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fail
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elsif student_count != Db::User.query.where(role: Db::UserRole::Student).count
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log "Not all students registered, skipping assignment"
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fail
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elsif vote_count < student_count
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log "Not all students voted, skipping assignment"
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fail
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elsif Db::Assignment.query.count > 0
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log "Assignment has already run, skipping another assignment"
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fail
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end
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teachers = Db::Teacher.query
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.where do
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raw("EXISTS (SELECT 1 FROM teacher_votes WHERE teacher_id = teachers.id)") &
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max_students > 0
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end
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end
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end
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end
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end
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end
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