Question

我正在编写一个程序，使用Mechanize使用学生帐户从edline.net抓取学生的成绩和班级，并返回我需要的数据。但是，在登录后，我必须从主页访问一个链接（称为“私人报告＆＃39;”），然后动态地返回一个链接页面到每个学生的班级和各自的成绩。

测试时，我创建了一个新对象my_account，它有几个实例变量，包括主页。我将新变量指向实例变量，以便更简单地阅读）：

result_page = agent.page.link_with(:text => 'Private Reports').click

我明白了：

Mechanize::UnsupportedSchemeError

但如果我要用:click替换:text，它会正确回复，而result_page将等同于链接的文字＆＃34;私人报告＆＃34;

为什么它会正确回复:text但是:click会出错？有没有办法解决这个问题，还是应该重新考虑我对这个问题的解决方案？

以下是代码：

 class AccountFetcher

     EDLINE_LOGIN_URL = 'http://edline.net/Index.page'

     def self.fetch_form(agent)

         # uses @agent of an Account object
         page = agent.get(EDLINE_LOGIN_URL)
         form = page.form('authenticationEntryForm')
     end


     # edline's login form has to have several pre-conditions met before submitting the form

     def self.initialize_form(agent)
         form = AccountFetcher.fetch_form(agent)
         submit_event = form.field_with(:name => 'submitEvent')
         enter_clicked = form.field_with(:name => 'enterClicked')
         ajax_support = form.field_with(:name => 'ajaxSupported')
         ajax_support.value = 'yes'
         enter_clicked.value = true
         submit_event.value = 1
         return form 
     end


     # logs the user in and returns the homepage

     def self.fetch_homepage(u_username, u_password, agent)
         form = AccountFetcher.initialize_form(agent)
         username = form.field_with(:name => 'screenName')
         password = form.field_with(:name => 'kclq')
         username.value = u_username
         password.value = u_password
         form.submit
     end
 end

 # class Account will be expanded later on but here are the bare bones for a user to log in to their account 
 class Account

     attr_accessor :report, :agent, :username, :password
     def initialize(u_username, u_password)
         @agent = Mechanize.new
         @username = u_username
         @password = u_password
     end

     def login
         page = AccountFetcher.fetch_homepage(self.username, self.password, self.agent) 
         @report = page
     end
 end 


 my_account = Account.new('ex_username', 'ex_password')
 my_account.login
 page = my_account.report
 agent = my_account.agent

 page = agent.page.link_with(:text => 'Private Reports').click

Answer 1

链接指向哪里？即，什么是href？

我问因为“scheme”通常指的是像http或https或ftp这样的东西，所以链接有一个奇怪的方案，机械化不知道如何处理，因此Mechanize::UnsupportedSchemeError

为什么我得到一个不受支持的问题错误

1 个答案: