instance method
update
Ruby on Rails 5.0.7.2
Since v3.0.20 Last seen in v5.1.7Signature
update(id = :all, attributes)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)
# Updates multiple records from the result of a relation
people = Person.where(group: 'expert')
people.update(group: 'masters')
Note: Updating a large number of records will run an UPDATE query for each record, which may cause a performance issue. So if it is not needed to run callbacks for each update, it is preferred to use #update_all for updating all records using a single query.
Parameters
-
idopt = :all -
attributesreq
Source
# File activerecord/lib/active_record/relation.rb, line 424
def update(id = :all, attributes)
if id.is_a?(Array)
id.map.with_index { |one_id, idx| update(one_id, attributes[idx]) }
elsif id == :all
records.each { |record| record.update(attributes) }
else
if ActiveRecord::Base === id
id = id.id
ActiveSupport::Deprecation.warn(<<-MSG.squish)
You are passing an instance of ActiveRecord::Base to `update`.
Please pass the id of the object by calling `.id`.
MSG
end
object = find(id)
object.update(attributes)
object
end
end
Defined in activerecord/lib/active_record/relation.rb line 424
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Defined in ActiveRecord::Relation