concat(*records)
Instance Public methods
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 inserts each record, push and concat
behave identically. Returns self so method calls may be
chained.
class Person < ActiveRecord::Base has_many :pets end person.pets.size # => 0 person.pets.concat(Pet.new(name: 'Fancy-Fancy')) person.pets.concat(Pet.new(name: 'Spook'), Pet.new(name: 'Choo-Choo')) person.pets.size # => 3 person.id # => 1 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.concat([Pet.new(name: 'Brain'), Pet.new(name: 'Benny')]) person.pets.size # => 5
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