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-rw-r--r--activerecord/test/cases/associations/has_many_through_associations_test.rb9
1 files changed, 9 insertions, 0 deletions
diff --git a/activerecord/test/cases/associations/has_many_through_associations_test.rb b/activerecord/test/cases/associations/has_many_through_associations_test.rb
index d5573b6d02..442f4a93d4 100644
--- a/activerecord/test/cases/associations/has_many_through_associations_test.rb
+++ b/activerecord/test/cases/associations/has_many_through_associations_test.rb
@@ -71,6 +71,15 @@ class HasManyThroughAssociationsTest < ActiveRecord::TestCase
club1.members.sort_by(&:id)
end
+ def test_preload_multiple_instances_of_the_same_record
+ club = Club.create!(name: "Aaron cool banana club")
+ Membership.create! club: club, member: Member.create!(name: "Aaron")
+ Membership.create! club: club, member: Member.create!(name: "Bob")
+
+ preloaded_clubs = Club.joins(:memberships).preload(:membership).to_a
+ assert_no_queries { preloaded_clubs.each(&:membership) }
+ end
+
def test_ordered_has_many_through
person_prime = Class.new(ActiveRecord::Base) do
def self.name; "Person"; end