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-rw-r--r--activerecord/test/cases/associations/has_and_belongs_to_many_associations_test.rb6
1 files changed, 6 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 f457dfb9b3..2fa2c6d13f 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
@@ -338,6 +338,12 @@ class HasAndBelongsToManyAssociationsTest < ActiveRecord::TestCase
assert_equal 3, project.developers.size
end
+ def test_uniq_when_association_already_loaded
+ project = projects(:active_record)
+ project.developers << [ developers(:jamis), developers(:david), developers(:jamis), developers(:david) ]
+ assert_equal 3, Project.includes(:developers).find(project.id).developers.size
+ end
+
def test_deleting
david = Developer.find(1)
active_record = Project.find(1)