Sha256: b97f71e4aa6f7896761fab4c2b7b56d0b54b070ea0a017eb5495feecb539939c
Contents?: true
Size: 1.79 KB
Versions: 22
Compression:
Stored size: 1.79 KB
Contents
require "cases/helper"
require "models/lesson"
require "models/student"
class HabtmDestroyOrderTest < ActiveRecord::TestCase
test "may not delete a lesson with students" do
sicp = Lesson.new(:name => "SICP")
ben = Student.new(:name => "Ben Bitdiddle")
sicp.students << ben
sicp.save!
assert_raises LessonError do
assert_no_difference('Lesson.count') do
sicp.destroy
end
end
assert !sicp.destroyed?
end
test 'should not raise error if have foreign key in the join table' do
student = Student.new(:name => "Ben Bitdiddle")
lesson = Lesson.new(:name => "SICP")
lesson.students << student
lesson.save!
assert_nothing_raised do
student.destroy
end
end
test "not destroying a student with lessons leaves student<=>lesson association intact" do
# test a normal before_destroy doesn't destroy the habtm joins
begin
sicp = Lesson.new(:name => "SICP")
ben = Student.new(:name => "Ben Bitdiddle")
# add a before destroy to student
Student.class_eval do
before_destroy do
raise ActiveRecord::Rollback unless lessons.empty?
end
end
ben.lessons << sicp
ben.save!
ben.destroy
assert !ben.reload.lessons.empty?
ensure
# get rid of it so Student is still like it was
Student.reset_callbacks(:destroy)
end
end
test "not destroying a lesson with students leaves student<=>lesson association intact" do
# test a more aggressive before_destroy doesn't destroy the habtm joins and still throws the exception
sicp = Lesson.new(:name => "SICP")
ben = Student.new(:name => "Ben Bitdiddle")
sicp.students << ben
sicp.save!
assert_raises LessonError do
sicp.destroy
end
assert !sicp.reload.students.empty?
end
end
Version data entries
22 entries across 22 versions & 3 rubygems