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-rw-r--r--activerecord/test/cases/associations/has_and_belongs_to_many_associations_test.rb12
1 files changed, 12 insertions, 0 deletions
diff --git a/activerecord/test/cases/associations/has_and_belongs_to_many_associations_test.rb b/activerecord/test/cases/associations/has_and_belongs_to_many_associations_test.rb
index ed7dde115a..515eb65d37 100644
--- a/activerecord/test/cases/associations/has_and_belongs_to_many_associations_test.rb
+++ b/activerecord/test/cases/associations/has_and_belongs_to_many_associations_test.rb
@@ -25,6 +25,8 @@ require "models/user"
require "models/member"
require "models/membership"
require "models/sponsor"
+require "models/lesson"
+require "models/student"
require "models/country"
require "models/treaty"
require "models/vertex"
@@ -780,6 +782,16 @@ class HasAndBelongsToManyAssociationsTest < ActiveRecord::TestCase
assert_equal [projects(:active_record), projects(:action_controller)].map(&:id).sort, developer.project_ids.sort
end
+ def test_singular_ids_are_reloaded_after_collection_concat
+ student = Student.create(name: "Alberto Almagro")
+ student.lesson_ids
+
+ lesson = Lesson.create(name: "DSI")
+ student.lessons << lesson
+
+ assert_includes student.lesson_ids, lesson.id
+ end
+
def test_scoped_find_on_through_association_doesnt_return_read_only_records
tag = Post.find(1).tags.find_by_name("General")