ruby-on-rails - Rails API 不拆分 Json

Question

奇怪的问题。如果底部的类是一个模块，拆分 Json 没有问题，如果它只是方法，也可以，但问题是..当它是一个类时，它不再拆分 Json，并返回一个空数组.. 但是，如果是一个类，我会做一个 puts 对象，它实际上是 puts it..关于为什么的任何想法？我该如何解决？

我有这个 Controller :

 def index
   begin
     call_employee_work_locations_api
      rescue => ex
      render :json => {"service unavailable": "0001" }, :status => :service_unavailable
   end 
 end

我有这个服务:

def call_employee_work_locations_api
   auth = {:username=>ENV["USERNAME"], :password=>ENV["PASSWORD"]}
   employee_locations = HTTParty.get(employee_work_Location_url , :basic_auth => auth)
   #serialize_work_location(employee_locations) 
   serializer = EmployeeSerializer.new
   serializer.serialize_work_location(employee_locations)
end 

我有这个构建器:

json.array!(@top_locations) do |location|
   json.extract! location, :name, :description, :latitude, :longitude
end

我有这门课:

class EmployeeSerializer

    def serialize_work_location(employee_locations)
        employee_locations= JSON.parse(employee_locations)
        locations=[]

        employee_locations["work_locations"].each do |attributes|
           location = Location.new(attributes["latitude"],attributes["longitude"],attributes["description"],attributes["name"])
          locations.push(location)
        end
        employee_locations_selector(locations)
    end 

    def top_office_location_selector(locations, city)
        top_locations=[]
        locations.each do |office|
            if office.name == city[0] then top_locations.push(office) end
            if office.name == city[1] then top_locations.push(office) end
        end
        @top_locations = top_locations
        p @top_locations <--- it prints the object perfectly, but does not pass to the view, I get an empty array instead.
     end

     def employee_locations_selector(locations)
        city = locations.each_with_object(Hash.new(0)) { |locations, counts| counts[locations.name] += 1 }.max_by{|k,v| v}
        top_office_location_selector(locations, city)
     end
end

Answer 1

实例变量 @top_locations 被设置在 EmployeeSerializer 类的范围内，而不是您的 Controller 。因此它只是一个普通的实例变量，所以 Rails 对此一无所知。您可以将 #top_office_location_selector 的返回值分配给 Controller 中的实例变量，它应该可以工作。

附带说明一下，通过使用 #map 而不是 #each 可以大大简化代码。