Question

我正在使用活动资源从api获取数据并显示它，
我的控制器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

当我调用此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会提供类似这样的东西

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

我的电话。

API返回正确的哈希值，但我认为活动资源无法正确读取它，它直接读取哈希键值对中的值。

我想解决这个“ArgumentError”错误，我想在视图中显示返回的哈希的内容。

Answer 1

您可以使用

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)，它会在您的API返回的json中找到并删除categories根元素。

Answer 2

API返回一个JSON对象，而不是Ruby哈希。您需要使用Ruby的JSON模块将其转换为哈希：

require 'JSON'

hash = JSON.parse('{"abs.com":["0.0.0.0", "1.1.1.1", "2.2.2.2", "3.3.3.3", "4.4.4.4"]}')

这将返回一个哈希，然后您会注意到键/值对将按预期工作：

hash["abs.com"] => ["0.0.0.0", "1.1.1.1", "2.2.2.2", "3.3.3.3", "4.4.4.4"]

主动资源抱怨期望哈希

2 个答案: