ActiveResource在freebase json請求上窒息

Question

我有ActiveResource設置來使用json中的freebase api，除了json freebase返回導致ActiveResource爆發外，它應該可以正常工作。

NoMethodError: undefined method `collect!' for #<Hash:0x007fd674831dd0> 

我該如何定義一個自定義json解析器來解決任何錯誤？

class Freebase < ActiveResource::Base 
    self.site = "https://www.googleapis.com/" 
    self.format = :json 

    def self.search(word) 
    self.find(:all, :from => "/freebase/v1/search/", :params => { :query => word }) 
    end 

    #https://www.googleapis.com/freebase/v1/search?query=nirvana 

    #Freebase.get('search', :query => 'nirvana') 

end 

的Json返回：使用Rails

https://www.googleapis.com/freebase/v1/search?query=nirvana

{"status":"200 OK","result":[{"mid":"/m/05b3c","name":"Nirvana","notable":{"name":"Belief","id":"/religion/belief"},"lang":"en","score":67.540009},{"mid":"/m/0b1zz","name":"Nirvana","notable":{"name":"Musical Artist","id":"/music/artist"},"lang":"en","score":64.311432},{"mid":"/m/092bf5","name":"Buddhism","notable":{"name":"Religion","id":"/religion/religion"},"lang":"en","score":33.647118},{"mid":"/m/02_6qh","name":"Nirvana","notable":{"name":"Film","id":"/film/film"},"lang":"en","score":30.068491},{"mid":"/m/01h89tx","name":"Nirvana","notable":{"name":"Musical Album","id":"/music/album"},"lang":"en","score":27.799274},{"mid":"/m/01rn9fm","name":"Nirvana","notable":{"name":"Musical Group","id":"/music/musical_group"},"lang":"en","score":27.445602},{"mid":"/m/015k7","name":"Gautama Buddha","notable":{"name":"Deity","id":"/religion/deity"},"lang":"en","score":24.129679},{"mid":"/m/01rkx5","name":"Mahayana Mahaparinirvana Sutra","lang":"en","score":22.359026},{"mid":"/m/03d7q7v","name":"Nirvana","lang":"en","score":21.034473},{"mid":"/m/055ym7w","name":"Nirvana bootleg recordings","notable":{"name":"Musical Album","id":"/music/album"},"lang":"en","score":19.241596},{"mid":"/m/0122_j","name":"Nevermind","notable":{"name":"Musical Album","id":"/music/album"},"lang":"en","score":18.366383},{"mid":"/m/04n7mt","name":"Nirvana fallacy","lang":"en","score":17.212397},{"mid":"/m/0484q","name":"Kurt Cobain","notable":{"name":"Musician","id":"/m/09jwl"},"lang":"en","score":16.594929},{"mid":"/m/027_k8j","name":"Nirvana","lang":"en","score":16.336584},{"mid":"/m/0285c","name":"Dave Grohl","notable":{"name":"Musician","id":"/m/09jwl"},"lang":"en","score":16.115103},{"mid":"/m/068shv","name":"Smells Like Nirvana","notable":{"name":"Musical Album","id":"/music/album"},"lang":"en","score":15.350652},{"mid":"/m/01kq85c","name":"Manic Nirvana","notable":{"name":"Musical Album","id":"/music/album"},"lang":"en","score":15.275189},{"mid":"/m/0437sc","name":"Lithium","notable":{"name":"Composition","id":"/music/song"},"lang":"en","score":14.637386},{"mid":"/m/055kh1","name":"Mechanus","lang":"en","score":14.621847},{"mid":"/m/01f1vf","name":"Lucifer","notable":{"name":"Fictional Character","id":"/fictional_universe/fictional_character"},"lang":"en","score":13.504528}],"cursor":20,"cost":11,"hits":3104} 

3.2.1

UPDATE：

發現這個問題，但仍然不知道如何克服它。 https://github.com/rails/rails/issues/2318

Answer 1

問題是返回的JSON沒有按照ActiveResource預期的方式形成。 ARes並不期望所有正在返回的元數據，它只是預期響應中的部分內容爲results。

要明確，你要回：

{"status":"200 OK","result":[{"mid":"/m/05b3c","name":"Nirvana","notable":{"name" ... 

但ARES想：

[{"mid":"/m/05b3c","name":"Nirvana","notable":{"name"... 

最簡單的（也可能是最髒的）解決方案，我能想出是覆蓋的ActiveResource :: Base＃find_every私有方法在你的模型是這樣的：

class Freebase < ActiveResource::Base 

    self.site = "https://www.googleapis.com/" 
    self.format = :json 

    def self.search(word) 
    self.find(:all, :from => "/freebase/v1/search/", :params => { :query => word }) 
    end 

    private 

    def self.find_every(options) 
    begin 
     case from = options[:from] 
     when Symbol 
     instantiate_collection(get(from, options[:params])) 
     when String 
     path = "#{from}#{query_string(options[:params])}" 
     instantiate_collection(format.decode(connection.get(path, headers).body['result']) || []) 
     else 
     prefix_options, query_options = split_options(options[:params]) 
     path = collection_path(prefix_options, query_options) 
     instantiate_collection((format.decode(connection.get(path, headers).body['result']) || []), prefix_options) 
     end 
    rescue ActiveResource::ResourceNotFound 
     # Swallowing ResourceNotFound exceptions and return nil - as per 
     # ActiveRecord. 
     nil 
    end 
    end 

end 

我做的唯一的改變是.body方法調用現在是.body['result']。有了這個添加，#instantiate_collection現在將接收一個數組，因爲它期望而不是哈希。

最終，雖然這會導致錯誤消失，但我不知道這會解決所有問題，因爲您可能需要使用此方法丟失的一些數據。我的建議是放棄ActiveResource（如果可以的話）並使用RestClient之類的東西並圍繞它建立模型。這種方法的另一個原因是，它們現在的語義被破壞了。你沒有收回Freebases的集合。您正在使用Freebase API來獲取搜索結果。

Answer 2

我跟德里克的建議和被遺棄的ActiveResource ...

爲別人我結束了使用法拉第和Faraday_Middleware

class Freebase 

    def self.search(id) 
    connection = Faraday.new 'https://www.googleapis.com/freebase/v1' do |conn| 

     conn.adapter Faraday.default_adapter 
     conn.use FaradayMiddleware::ParseJson 
     #conn.use Faraday::Response::Mashify 
    end 

    response = connection.get do |req| 
     req.url('search', :query => id, :limit => 10)#, :filter => '(any namespace:/wikipedia/en_id namespace:/authority/imdb/title)')# #:filter => '(any namespace:/wikipedia/en_id namespace:/authority/imdb/title namespace:/authority/netflix/movie)' , :with => 'commons' 
    end 

    end 

據說你可以使用一些內置模塊，使軌道式的方法進行的返回的散列，但我還沒有想出那部分。 ActiveResource似乎只適用於其他Rails應用程序或完全模仿它的RESTful路線。