build(attributes = {}, &block)
Instance Public methods
Returns a new object of the collection type that has been instantiated with
attributes and linked to this object, but have not yet been
saved. You can pass an array of attributes hashes, this will return an
array with the new objects.
class Person
has_many :pets
end
person.pets.build
# => #<Pet id: nil, name: nil, person_id: 1>
person.pets.build(name: 'Fancy-Fancy')
# => #<Pet id: nil, name: "Fancy-Fancy", person_id: 1>
person.pets.build([{name: 'Spook'}, {name: 'Choo-Choo'}, {name: 'Brain'}])
# => [
# #<Pet id: nil, name: "Spook", person_id: 1>,
# #<Pet id: nil, name: "Choo-Choo", person_id: 1>,
# #<Pet id: nil, name: "Brain", person_id: 1>
# ]
person.pets.size # => 5 # size of the collection
person.pets.count # => 0 # count from database
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