class ActiveRecord::Associations::CollectionProxy

def create(attributes = {}, &block)

# ]
# #
# #,
# #,
# => [
person.pets.find(1, 2, 3)

person.pets.count # => 3
person.pets.size # => 3

# ]
# #
# #,
# => [
person.pets.create([{name: 'Spook'}, {name: 'Choo-Choo'}])

# => #
person.pets.create(name: 'Fancy-Fancy')

end
has_many :pets
class Person

passes the validations).
attributes, linked to this object and that has already been saved (if it
Returns a new object of the collection type that has been instantiated with 
def create(attributes = {}, &block)
  @association.create(attributes, &block)
end