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-rw-r--r--activerecord/lib/active_record/associations/collection_proxy.rb3
1 files changed, 3 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/associations/collection_proxy.rb b/activerecord/lib/active_record/associations/collection_proxy.rb
index e11c9490b7..685c3a5f17 100644
--- a/activerecord/lib/active_record/associations/collection_proxy.rb
+++ b/activerecord/lib/active_record/associations/collection_proxy.rb
@@ -976,6 +976,9 @@ module ActiveRecord
# Equivalent to +delete_all+. The difference is that returns +self+, instead
# of an array with the deleted objects, so methods can be chained. See
# +delete_all+ for more information.
+ # Note that because +delete_all+ removes records by directly
+ # running an SQL query into the database, the +updated_at+ column of
+ # the object is not changed.
def clear
delete_all
self