RoR - check if record exist before build

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I have two models

Address.rb
  belongs_to :zip
  accepts_nested_attributes_for :zip

Zip.rb
  has_many :addresses

on the form for a new Address I also create a Zip. But i want to check if the inserted Zip already exists. If it does it should return the existing Zip, if it doesn't it should create a new one

AddressController
  def new
    @address = Address.new
    @address.build_zip
  end

I saw on StackOverFlow a similar question without the answer I was hopping for... Someone suggested:

  before_create :check_zip_exists

  def check_zip_exists
    @zip = Zip.find_by_cp1_and_cp2(self.cp1, self.cp2)
    if @zip!=nil
      #
    end
  end

what should be at # in order to associate the existing Zip to the Address instead creating a new one?

asked 36 secs ago

NunoRibeiro

22

RoR - check if record exist before build