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-rw-r--r--activerecord/lib/active_record/validations/uniqueness.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/validations/uniqueness.rb b/activerecord/lib/active_record/validations/uniqueness.rb
index baeb653c61..f4ad58c087 100644
--- a/activerecord/lib/active_record/validations/uniqueness.rb
+++ b/activerecord/lib/active_record/validations/uniqueness.rb
@@ -219,7 +219,7 @@ module ActiveRecord
# can catch it and restart the transaction (e.g. by telling the user
# that the title already exists, and asking them to re-enter the title).
# This technique is also known as
- # {optimistic concurrency control}[http://en.wikipedia.org/wiki/Optimistic_concurrency_control].
+ # {optimistic concurrency control}[https://en.wikipedia.org/wiki/Optimistic_concurrency_control].
#
# The bundled ActiveRecord::ConnectionAdapters distinguish unique index
# constraint errors from other types of database errors by throwing an