diff options
Diffstat (limited to 'activerecord/lib/active_record/associations/collection_proxy.rb')
| -rw-r--r-- | activerecord/lib/active_record/associations/collection_proxy.rb | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/associations/collection_proxy.rb b/activerecord/lib/active_record/associations/collection_proxy.rb index 03cbba8dea..401019e1f3 100644 --- a/activerecord/lib/active_record/associations/collection_proxy.rb +++ b/activerecord/lib/active_record/associations/collection_proxy.rb @@ -37,6 +37,33 @@ module ActiveRecord delegate :target, :load_target, :loaded?, :to => :@association ## + # :method: first + # Returns the first record, or the first +n+ records, from the collection. + # If the collection is empty, the first form returns nil, and the second + # form returns an empty array. + # + # class Person < ActiveRecord::Base + # has_many :pets + # end + # + # person.pets + # # => [ + # # #<Pet id: 1, name: "Fancy-Fancy", person_id: 1>, + # # #<Pet id: 2, name: "Spook", person_id: 1>, + # # #<Pet id: 3, name: "Choo-Choo", person_id: 1> + # + # person.pets.first # => #<Pet id: 1, name: "Fancy-Fancy", person_id: 1> + # person.pets.first(2) + # # => [ + # # #<Pet id: 1, name: "Fancy-Fancy", person_id: 1>, + # # #<Pet id: 2, name: "Spook", person_id: 1> + # # ] + # + # another_person_without.pets # => [] + # another_person_without.pets.first # => nil + # another_person_without.pets.first(3) # => [] + + ## # :method: concat # Add one or more records to the collection by setting their foreign keys # to the association's primary key. Since << flattens its argument list and |