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Add #update_columns entry in Rails 4.0 release notes [ci skip]

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1 parent 7a2b809 commit 46f0fc6968493132da417e3e06f3c8aa09f54038 @smartinez87 smartinez87 committed with vijaydev Sep 27, 2012
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  1. +8 −0 guides/source/4_0_release_notes.md
@@ -652,6 +652,14 @@ Active Record
* PostgreSQL hstore types are automatically deserialized from the database.
+* Added `#update_columns` method which updates the attributes from the passed-in hash without calling save, hence skipping validations and callbacks. `ActiveRecordError` will be raised when called on new objects or when at least one of the attributes is marked as read only.
+
+ ```ruby
+ post.attributes # => {"id"=>2, "title"=>"My title", "body"=>"My content", "author"=>"Peter"}
+ post.update_columns({title: 'New title', author: 'Sebastian'}) # => true
+ post.attributes # => {"id"=>2, "title"=>"New title", "body"=>"My content", "author"=>"Sebastian"}
+ ```
+
### Deprecations
* Deprecated most of the 'dynamic finder' methods. All dynamic methods except for `find_by_...` and `find_by_...!` are deprecated. Here's how you can rewrite the code:

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