参数数量错误(2 代表 1)，Rails 中的 UsersController [英] wrong number of arguments (2 for 1), UsersController in Rails

问题描述

我正在学习 Michael Hartl 的 Ruby on Rails 教程，虽然我已经能够为了自己解决一些错误，从我跋涉到第 9 章的这个错误让我绕了一圈.

I'm making my way through Michael Hartl's Ruby on Rails Tutorial and, while I have been able to troubleshoot a few errors on my own, this one from my trek through chapter 9 is sending me in circles.

我的views/users/index.html.erb:

<% provide(:title, 'All users') %>
<h1>All users</h1>

<ul class="users">
  <% @users.each do |user| %> # Line flagged with error
    <li>
      <%= gravatar_for user, size: 50 %>
      <%= link_to user.name, user %>
    </li>
  <% end %>
</ul>

我的用户助手:

module UsersHelper

  def gravatar_for(user, options = { size: 50 })
    gravatar_id = Digest::MD5::hexdigest(user.email.downcase)
    gravatar_url = "https://secure.gravatar.com/avatar/#{gravatar_id}"
    image_tag(gravatar_url, alt: user.name, class: "gravatar")
  end
end

该错误还标记了我的文件中不存在的另一行代码；我猜它来自 Ruby 到 HTML 的转换?

The error also flags another line of code that doesn't exist in my files; I guess it comes from the Ruby to HTML conversion?

delegate :to_xml, :to_yaml, :length, :collect, :map, :each, :all?, :include?, :to_ary, :join, to: :to_a

我已经为此苦恼了将近两个小时，但没有任何进展.我所知道的是，当我用简单的文本替换索引页时，这些错误就会消失.这是 Gravatar 的问题吗?我真的不知道，希望得到任何帮助.

I've been scratching my head at this for almost two hours with no progress. All I know is that these errors go away when I replace the index page with simple text. Is this a problem with Gravatar? I really have no clue and would appreciate any help.

推荐答案

好的，您将许多参数传递给 gravatar_for 方法.将其重新定义如下，您可以照常使用它:

Ok, you pass to many args to the gravatar_for method. Redefine it as following and you can use it as you do:

def gravatar_for(user, options = { size: 50 })
  gravatar_id = Digest::MD5::hexdigest(user.email.downcase)
  size = options[:size]
  gravatar_url = "https://secure.gravatar.com/avatar/#{gravatar_id}?s=#{size}"
  image_tag(gravatar_url, alt: user.name, class: "gravatar")
end

您必须进一步阅读以了解如何重新定义该方法(它必须在某处).

You have to read further to see how to redefine the method (it must be somewhere there).

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