如何使用Grape API嵌套属性？

如何解决如何使用Grape API嵌套属性？

我的模型具有嵌套属性，但是无法通过API请求检索它们。我尝试使用Grape实体，但对我不起作用。如何使用Grape使用父对象检索嵌套属性？

api.rb

import UIKit
import CoreLocation
import MapKit

class HoMetableViewController: UITableViewController,UICollectionViewDataSource,UICollectionViewDelegate,UICollectionViewDelegateFlowLayout,CLLocationManagerDelegate,MKMapViewDelegate {

@IBOutlet weak var mapView: MKMapView!

override func viewDidLoad() {
    super.viewDidLoad()
    
    // Always adopt a light interface style.
    overrideUserInterfaceStyle = .light
    
    let gestureRecognizer = UITapGestureRecognizer(target: self,action:"triggerTouchAction:")
    mapView.addGestureRecognizer(gestureRecognizer)
    
}

override func numberOfSections(in tableView: UITableView) -> Int {
    // #warning Incomplete implementation,return the number of sections
    return 1
}

override func tableView(_ tableView: UITableView,numberOfRowsInSection section: Int) -> Int {
    // #warning Incomplete implementation,return the number of rows
    return 7
}

func triggerTouchAction(gestureReconizer: UITapGestureRecognizer) {
      //Add alert to show it works
    print("Map Tapped")
}

provider_forms.rb

module Sims
 class API < Grape::API
   format :json
   prefix :api
   version 'v1',:path
 
   mount Sims::V1::ProviderForms
 end
end

personal_info_entity.rb

module Sims
 module V1
  class ProviderForms < Sims::API
    include Grape::Kaminari
     params do
      use :pagination,per_page: 20,max_per_page: 30
     end

  resources :provider_forms do
    desc 'return provider forms'
    get do
     present paginate(ProviderForm.all),with: PersonalInfoEntity
    end
 end

provider_form.rb

   class PersonalInfoEntity < Grape::Entity
     expose personal_info do
       expose :first_name
       expose :last_name
     end
    end

personal_info.rb

  class ProviderForm < ActiveRecord
    has_one :personal_info,dependent: :destroy
    accepts_nested_attributes_for :personal_info,allow_destroy: true
  end