ruby-on-rails - 提示的事件资源需要散列

Question

我正在使用事件资源从 api 获取数据并显示它，
我的 Controller model.rb 有

class Thr::Vol::Dom < ActiveResource::Base
  class << self
    def element_path(id, prefix_options = {}, query_options = nil)
      prefix_options, query_options = split_options(prefix_options) if query_options.nil?
      "#{prefix(prefix_options)}#{collection_name}/#{id}#{query_string(query_options)}"
    end

    def collection_path(prefix_options = {}, query_options = nil)
      prefix_options, query_options = split_options(prefix_options) if query_options.nil?
      "#{prefix(prefix_options)}#{collection_name}#{query_string(query_options)}"
    end
  end

  ActiveResource::Base.site = 'http://10.00.0.00:8888/'

  self.format = :json
  self.collection_name= "/vv/test/domains"

  def self.find
    x = superclass.find(:one, :from => '/vv/test/domains/2013-06-25T05:03Z')
    x
  end
end

当我调用这个 Thr::Vol::Dom.find 方法时，它返回以下错误:

ArgumentError: expected an attributes Hash, 
  got ["0.0.0.0", "1.1.1.1", "2.2.2.2", "3.3.3.3", "4.4.4.4"]

预计 api 会提供这样的东西

{"abs.com":["0.0.0.0", "1.1.1.1", "2.2.2.2", "3.3.3.3", "4.4.4.4"]}

对于我打的电话。

API 返回正确的散列，但我猜事件资源无法正确读取它，它直接读取散列的键值对中的值。

我想修复这个“ArgumentError”错误，我想在 View 中显示返回的散列的内容。

Answer 1

您可以更改 ActiveResource 处理 json 响应的方式

class YourModel < ActiveResource::Base
  self.format = ::JsonFormatter.new(:collection_name)
end

在 lib/json_formatter.rb

class JsonFormatter
  include ActiveResource::Formats::JsonFormat

  attr_reader :collection_name

  def initialize(collection_name)
    @collection_name = collection_name.to_s
  end

  def decode(json)
    remove_root(ActiveSupport::JSON.decode(json))
  end

  private

  def remove_root(data)
    if data.is_a?(Hash) && data[collection_name]
      data[collection_name]
    else
      data
    end
  end
end

如果您通过 self.format = ::JsonFormatter.new(:categories)它会找到并删除 categories API 返回的 json 中的根元素。