Contents

# frozen_string_literal: true

class LessonError < Exception
end

class Lesson < ActiveRecord::Base
  has_and_belongs_to_many :students
  before_destroy :ensure_no_students

  def ensure_no_students
    raise LessonError unless students.empty?
  end
end

Version data entries

6 entries across 6 versions & 2 rubygems

Version	Path
ibm_db-5.5.0	test/models/lesson.rb
ibm_db-5.4.1	test/models/lesson.rb
ibm_db-5.4.0	test/models/lesson.rb
ibm_db-5.3.2	test/models/lesson.rb
ibm_db-5.3.1	test/models/lesson.rb
ruby-on-quails-0.1.0	activerecord/test/models/lesson.rb