Ruby on Rails

Hello,

I want to restrict my users having more than one address. 

Here are the definitions from my classes :

class User < ActiveRecord::Base    has_one :address, dependent: :destroy  end  class Address < ActiveRecord::Base    belongs_to :user    validates :user, presence: true    validate :user_association      def user_association      unless Address.where(user_id: user.id).count == 0        errors.add(:user_id, 'Only one address per user')      end    end  end

I'm creating my address from user model, like this :

def create_address_relation      a = Address.create(address_type: @type.to_s, user_id: id)      self.address = a  end

However when I'm able to create two address objects for same user. (I'm using paranoia gem for soft deleting objects, not sure if that is relevant)

Any suggestion how to make validations work? except unique index on the db