Contents

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

22 entries across 22 versions & 3 rubygems

Version	Path
ibm_db-5.2.0	test/models/lesson.rb
ibm_db-5.1.0	test/models/lesson.rb
ibm_db-5.0.5	test/models/lesson.rb
ibm_db-5.0.4	test/models/lesson.rb
ibm_db-5.0.3	test/models/lesson.rb
ibm_db-5.0.2	test/models/lesson.rb
ibm_db-4.0.0-x86-mingw32	test/models/lesson.rb
ibm_db-4.0.0	test/models/lesson.rb
ibm_db-3.0.4-x86-mingw32	test/models/lesson.rb
ibm_db-3.0.4	test/models/lesson.rb
ibm_db-3.0.3-x86-mingw32	test/models/lesson.rb
ibm_db-3.0.3	test/models/lesson.rb
ibm_db-3.0.2-x86-mingw32	test/models/lesson.rb
ibm_db-3.0.2	test/models/lesson.rb
activejob-lock-0.0.2	rails/activerecord/test/models/lesson.rb
ibm_db-3.0.1	test/models/lesson.rb
ibm_db-3.0.1-x86-mingw32	test/models/lesson.rb
activejob-lock-0.0.1	rails/activerecord/test/models/lesson.rb
activerecord-nuodb-adapter-2.0.3	test/models/lesson.rb
activerecord-nuodb-adapter-2.0	test/models/lesson.rb