Make update_attribute use the same writer method that update_attributes uses.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@2353 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/CHANGELOG

 *SVN*
 
+* Make update_attribute use the same writer method that update_attributes uses.
+ #2237 [trevor@protocool.com]
+
 * Make migrations honor table name prefixes and suffixes. #2298 [Jakob S, Marcel Molina]
 
 * Correct and optimize PostgreSQL bytea escaping.  #1745, #1837 [dave@cherryville.org, ken@miriamtech.com, bellis@deepthought.org]

activerecord/lib/active_record/base.rb

@@ -1057,7 +1057,7 @@ def clone
       # Note: This method is overwritten by the Validation module that'll make sure that updates made with this method
       # doesn't get subjected to validation checks. Hence, attributes can be updated even if the full object isn't valid.
       def update_attribute(name, value)
-        self[name] = value
+        send(name.to_s + '=', value)
         save
       end
 

activerecord/lib/active_record/validations.rb

@@ -661,7 +661,7 @@ def save!
     # This is especially useful for boolean flags on existing records. The regular +update_attribute+ method
     # in Base is replaced with this when the validations module is mixed in, which it is by default.
     def update_attribute_with_validation_skipping(name, value)
-      self[name] = value
+      send(name.to_s + '=', value)
       save(false)
     end