2

我有以下 XML 结构:

<agencies>
  <city>
    <name>New York</name>
    <address>Street A, 101</address>
    <phone>111-222-333</phone>
  </city>
  <city>
    <name>Chicago</name>
    <address>Street B, 201</address>
    <phone>111-222-333</phone>
  </city>
</agencies>

我正在尝试创建一个 Ruby 类来使用它。

我创建了类文件:

require 'nokogiri'

class Agency

  def initialize(arg)
    @file = arg.gsub(/-/,'_')
    @doc = Nokogiri::XML(open("db/agencies/#{@file}.xml"))
  end

  def find_offices
    @doc.xpath('//agencies/city').map do |i|
      { 'name' => xpath('name') }
    end
    #@entries = @doc.xpath('//agencies/city').map do |i|
    #  { 'name' => xpath('name').inner_text, 'address' => xpath('address').inner_text, 'phone' => xpath('phone').inner_text }
    #end
  end
end

对于我的控制器,我有:

class AgenciesController < ApplicationController

  def index
    @prefectures = Prefecture.all
  end

  def list
    @prefecture = Agency.new(params[:prefecture_name])
    @offices = @prefecture.find_offices
  end
end

list方法返回以下错误:

NoMethodError in AgenciesController#list

undefined method `xpath' for #<Agency:0x9e7f280>
Rails.root: /home/kleber/projects/rails_apps/job_board2

Application Trace | Framework Trace | Full Trace
app/models/agency.rb:13:in `block in find_offices'
app/models/agency.rb:12:in `map'
app/models/agency.rb:12:in `find_offices'
app/controllers/agencies_controller.rb:9:in `list'
4

1 回答 1

2

这部分看起来很有趣:

def find_offices
    @doc.xpath('//agencies/city').map do |i|
      { 'name' => xpath('name') }
    end

i您为查询返回的每个元素创建一个局部变量,xpath()但不使用它。您正在调用xpath('name'),但我没有看到可以调用xpath()的类(或全局范围内)的定义。

你的意思是写更像这样的东西吗?(未经测试):

      { 'name' => i.xpath('name') }
于 2012-06-19T23:30:20.700 回答