update(id, attributes) public

Updates an object (or multiple objects) and saves it to the database, if validations pass. The resulting object is returned whether the object was saved successfully to the database or not.

Parameters

  • id - This should be the id or an array of ids to be updated.
  • attributes - This should be a hash of attributes or an array of hashes.

Examples

  # Updates one record
  Person.update(15, :user_name => 'Samuel', :group => 'expert')

  # Updates multiple records
  people = { 1 => { "first_name" => "David" }, 2 => { "first_name" => "Jeremy" } }
  Person.update(people.keys, people.values)
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July 27, 2011 - (>= v3.0.0)
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Multiple update, on query ?

Person.update(people.keys, people.values)

Will this request issue one or multiple queries to update the table data (as in http://stackoverflow.com/questions/3432/multiple-updates-in-mysql#3466 )

The answer is: it will do TWO queries per updated row. One select and one update.

November 30, 2012
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Beware: virtual attributes are ignored

Even though validations are called, virtual attributes are ignored.