class ContactSerializer < ActiveModel::Serializer include NullAttributeReplacer attributes :id, :name, :account_type, :email, :address, :contact_number, :done_deal_user_id has_one :profile_picture, class_name: "Image::ProfilePicture", serializer: ProfilePictureSerializer do if object.done_deal_user && object.done_deal_user.profile_picture object.done_deal_user.profile_picture else Image::ProfilePicture.new end end end