diff options
Diffstat (limited to 'activerecord/lib/active_record')
| -rw-r--r-- | activerecord/lib/active_record/relation.rb | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/relation.rb b/activerecord/lib/active_record/relation.rb index cdafa6a50a..ab3debc03b 100644 --- a/activerecord/lib/active_record/relation.rb +++ b/activerecord/lib/active_record/relation.rb @@ -362,9 +362,21 @@ module ActiveRecord # # Updates multiple records # people = { 1 => { "first_name" => "David" }, 2 => { "first_name" => "Jeremy" } } # Person.update(people.keys, people.values) - def update(id, attributes) + # + # # 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 a + # 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 <tt>update_all</tt> for updating all records using + # a single query. + 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 + to_a.each { |record| record.update(attributes) } else object = find(id) object.update(attributes) |