Updating several model instances at the same time, The Rails Way?

I have a settings table with two fields, key and value. Now, while creating an administration secti开发者_运维技巧on for it I want to be able to edit all settings at once.

Is there a "Rails (3) way" to do this that will save me some time?

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ActiveRecord has an update_all method for updating all the records with the specified string of column and value pairs that match the usual conditions etc. that find supports. The method issues a single SQL UPDATE statement behind the scenes.

For example:

Setting.update_all("key = 'foo', value = 'bar'")

—equates to:

UPDATE settings SET key='foo', value='bar';

• update_all API documentation

If you want to perform a mass update of multiple settings with different key/value values then there are a couple of Railscasts that cover how to do this:

• Episode #165: Edit Multiple
• Episode #198: Edit Multiple Individually