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-rw-r--r--activerecord/lib/active_record/persistence.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/persistence.rb b/activerecord/lib/active_record/persistence.rb
index e84a479a13..4ec0431b8c 100644
--- a/activerecord/lib/active_record/persistence.rb
+++ b/activerecord/lib/active_record/persistence.rb
@@ -137,6 +137,8 @@ module ActiveRecord
# * Callbacks are skipped.
# * updated_at/updated_on column is not updated if that column is available.
#
+ # Raises an +ActiveRecordError+ when called on new objects, or when the +name+
+ # attribute is marked as readonly.
def update_column(name, value)
name = name.to_s
raise ActiveRecordError, "#{name} is marked as readonly" if self.class.readonly_attributes.include?(name)