update
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- What's this?
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)
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.
Beware: virtual attributes are ignored
Even though validations are called, virtual attributes are ignored.