渲染JSON / XML非ActiveRecord对象[回报率] [英] Render non-activerecord objects in JSON/XML [RoR]

问题描述

我正在测试一个小型的whois API使用红宝石宝石域名注册，并且由于域名注册的反应是相当有趣的，有时我被要求不要使用ActiveRecord用于保存响应格式。

I am testing a small whois API using the ruby gem whois, and due to the format of whois responses being quite funny sometimes i was asked not to use ActiveRecord for saving the responses.

简单地说，这里的工作原理是：

Simply put, here's how it works :

1. 用户从一个视图（动作'查找'=创建的请求）输入表单中的域名
2. 控制器捕捉参数然后instanciating请求对象[含域名注册响应]发送到模型（非ActiveRecord的）
3. 模型使用whois的宝石，并发送回控制器收到WHOIS响应
4. 控制器发送不同格式的响应（HTML / JSON / XML），但只有HTML获取对象。

下面是code对我的控制器请求动作查找：

Here is the code for the action "lookup" of my controller "requests" :

def lookup
domain = params[:domain]
@request = Request.new.search(domain)

respond_to do |format|
  if @request != nil
    format.html
    format.json { render :json => @request}
    format.xml {render :xml => @request}
  else
    format.html { render :new }
    format.json { render json: @request.errors, status: :unprocessable_entity }
  end
end

显然，我有一个困难时期，因为我没有使用ActiveRecord的，而且由于回报率是在等待着他不断随地吐痰nilClass例外。

Obviously, i'm having a hard time because i'm not using ActiveRecord, and since RoR is expecting one he keeps spitting nilClass exceptions.

所以，当我去本地主机：8080 /请求/查找一切都显示正常，并@request包含了所有我想要的数据。 但阉本地主机：8080 /请求/ lookup.json 或本地主机：8080 /请求/ lookup.xml 没有显示如果我尝试在建设者发出指示（在Jbuilder / XMLBuilder），它抛出一个nilClass异常，证明了可变范围并不全球...

So when i go on localhost:8080/requests/lookup everything is displayed fine, and @request contains all the data i want. But wether localhost:8080/requests/lookup.json or localhost:8080/requests/lookup.xml nothing shows up and if I try giving instructions in the builders (Jbuilder/XMLBuilder) it throws a nilClass exception, proving that the variable scope isn't so global...

不，我不认为投入变量会是个好主意：我只用它为单个查询

And no, i don't think putting in the variable session is a good idea : I will only be using it for a single query.

如果需要的话，我会很乐意提供更多我的code。如果它可以帮助你理解我的问题。我知道AR是要走的路，但尽管如此我很好奇，知道怎么去解决它像这样的情况。

If needed, i'll be happy to provide more of my code if it may help you understand my problem. I know AR is the way to go, but nonetheless i am curious as to know how to get around it for situations such as this one.

感谢您！

推荐答案

您可以使用加载ActiveModel，即使你不使用的ActiveRecord。轨道4使它很容易。您还可以添加加载ActiveModel ::系列化它允许您使用<序列化对象code> .to_json 和 .to_xml

You can use ActiveModel even though you are not using ActiveRecord. Rails 4 made it really easy. You can also add ActiveModel::Serialization which allows you to serialize the objects with .to_json and .to_xml

class WhoisLookup
  include ActiveModel::Model
  include ActiveModel::Serializers::JSON
  include ActiveModel::Serializers::Xml

  attr_accessor :search_term # ...

  # you can use all the ActiveModel goodies
  validates :search_term, presence: true, length: {in:2..255}
end

加载ActiveModel ::序列化将允许您使用：

ActiveModel::Serialization will allow you to use:

format.json { render :json => @result } # calls @result.to_json

PS。鸵鸟政策使用 @request 的变量命名（@result也许？）you're绑定到 ActionDispatch遇到的问题和困惑::请求。

PS. don´t use @request for variable naming (@result maybe?) you´re bound to run into issues and confusion with ActionDispatch::Request.

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