Rails API不會拆分Json

Question

奇怪的問題。如果底層的類是一個模塊，將Json拆分成沒有問題，如果它只是方法，也可以，但問題在於，當它是一個類時，它不再拆分Json，並返回一個空數組..但是，如果作爲一個班級，我做了一個放置對象，它實際上把它.. 任何想法爲什麼？我該如何解決它？

我有這樣的控制器：

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

我有這樣的服務：

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 

我有這樣的建設者：

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

我有這個類：

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

實例變量@top_locations正在EmployeeSerializer類的範圍內設置，而不是您的控制器。因此它只是一個普通的實例變量，所以Rails對此一無所知。您可以將返回值#top_office_location_selector分配給控制器中的實例變量，並且它應該可以工作。

在附註中，通過使用#map而不是#each可以清除很多代碼。