Active Record Query to get optional has_one

Question

I am using Rails 3.2 and have the following and would like to load all the site placements with their native_ad_placement and sites. A NativeAdPlacement is also optional so could be nil. How would I do this?

class Site < ActiveRecord::Base
  has_many :site_placements
end

class SitePlacement < ActiveRecord::Base
  has_one :native_ad_placement
  belongs_to :site
end

class NativeAdPlacement < ActiveRecord::Base
  belongs_to :site_placement
end

Answer 1

You don't have to do anything - has_one is optional by default. If you're getting an error, check for any presence validations which could throw these.