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-rw-r--r--activerecord/test/cases/relations_test.rb9
1 files changed, 9 insertions, 0 deletions
diff --git a/activerecord/test/cases/relations_test.rb b/activerecord/test/cases/relations_test.rb
index 5f96145b47..bc6cac0c6c 100644
--- a/activerecord/test/cases/relations_test.rb
+++ b/activerecord/test/cases/relations_test.rb
@@ -1391,6 +1391,15 @@ class RelationTest < ActiveRecord::TestCase
end
end
+ test "loaded relations cannot be mutated by extending!" do
+ relation = Post.all
+ relation.to_a
+
+ assert_raises(ActiveRecord::ImmutableRelation) do
+ relation.extending! Module.new
+ end
+ end
+
test "relations show the records in #inspect" do
relation = Post.limit(2)
assert_equal "#<ActiveRecord::Relation [#{Post.limit(2).map(&:inspect).join(', ')}]>", relation.inspect