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-rw-r--r--activerecord/lib/active_record/persistence.rb4
1 files changed, 3 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/persistence.rb b/activerecord/lib/active_record/persistence.rb
index ae1c326d95..dac35d7741 100644
--- a/activerecord/lib/active_record/persistence.rb
+++ b/activerecord/lib/active_record/persistence.rb
@@ -205,7 +205,9 @@ module ActiveRecord
# instance using the companies/company partial instead of clients/client.
#
# Note: The new instance will share a link to the same attributes as the original class.
- # So any change to the attributes in either instance will affect the other.
+ # Therefore the sti column value will still be the same.
+ # Any change to the attributes on either instance will affect both instances.
+ # If you want to change the sti column as well, use +becomes!+ instead.
def becomes(klass)
became = klass.new
became.instance_variable_set("@attributes", @attributes)