我正在跟随Michael Hartl的
here教程,并试图创建一个用户的索引.
我的代码：
- class UsersController < ApplicationController
- before_filter :signed_in_user,only: [:index,:edit,:update]
- .
- .
- .
- def index
- @users = User.all
- end
- .
- .
- .
- end
和
- <%= provide(:title,'All users') %>
- <h1>All users</h1>
- <ul class="users">
- <% @users.each do |user| %>
- <li>
- <%= gravatar_for user,size: 52 %>
- <%= link_to user.name,user %>
- </li>
- <% end %>
- </ul>
- wrong number of arguments (2 for 1)
我究竟做错了什么？有什么想法吗？
解决方法
根据教程,gravatar_for方法被定义为
- def gravatar_for(user)
- 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
请注意,它只接受一个参数：用户. Later in chapter 7,练习后,本教程介绍如何添加一个size参数：
- # Returns the Gravatar (http://gravatar.com/) for the given user.
- 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,class: "gravatar")
- end