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

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Sebastian Martinez 2012-09-27 13:01:21 -03:00 committed by Vijay Dev
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guides/source/4_0_release_notes.md
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@ -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: