Question

我知道之前已经问过这个问题，但我认为我做的一切都很正确，但仍然无法正常工作。

我有一个简单的用户表，一对多关系表。我只想显示部分中所选用户之后的人数。它在非局部视图中工作正常，但我一直收到错误：

 undefined method `name'

当我将普通视图变为局部视图时，它突出显示错误的焦点为

def gravatar_for(user, size = 30, title = user.name)

这是我使用的辅助方法

部分在这里（称为users/_show_follow）：

<% provide(:title, @title) %>
<div class="row">
  <aside class="col-md-4">
    <section class="user_info">
      <%= gravatar_for user %>
      <h1><%= user.name %></h1>
      <span><%= link_to "view my profile", user %></span>
    </section>

    <section class="stats">
      <%= render 'shared/stats' %>
      <% if users.any? %>
        <div class="user_avatars">
          <% for user in users %>  
            <%= link_to gravatar_for(user, size: 30), user %>
          <% end %>
        </div>
      <% end %>
    </section>


  </aside>
  <div class="col-md-8">
    <h3><%= @title %></h3>
    <% if users.any? %>
      <ul class="users follow">
        <%= render users %>
      </ul>
      <%= will_paginate %>
    <% end %>
  </div>
</div>

部分的原始页面：

    <div class="container-fluid">
    <div class="row-fluid">
          <div class="col-md-8">
                <div id="chart"><%= javascript_include_tag('graph') %></div>
          </div>
          <div class="col-md-2">
                <p>
                <h2>Node Score</h2>
                <div id="FBDiv"></div>
                <div id="chart_1"></div>
                <h2>Node Profile</h2>
                <div id="NodeProfile"></div>
                <h2>My inner circle</h2>
                <h2>Wants to connect</h2>
                <h2>My profile</h2>
                <%= current_user.about %>
                      <section class="stats">
                <%= render 'shared/stats' %>
                <%= render :partial => "show_follow", :locals => {:user => @user, :users => @users} %>
      </section>
      </section>
          </div>
    </div>
</div>
<div class="container-fluid">
    <div class="row">
        <div class="col-md-4"></div>
    </div>
</div>

控制器

    class UsersController < ApplicationController


    def index
         @users = User.including_relationships
         respond_to do |format|
         format.html # index.html.erb
         format.json {  render json: @users } 
         end
    end

     def show
      @user = User.find_by name: params[:name]
        respond_to do |format|
          # Here we need to remove the layout because the request
          # is done via ajax and the layout is already loaded.
          format.json {  render json: @user.to_json } 
        end
     end

     def following
          @title = "Following"
          @user = User.find(params[:id])
          @users = @user.followed_users.paginate(page: params[:page])
          render 'show_follow'
      end

      def followers
          @title = "Followers"
          @user = User.find(params[:id])
          @users = @user.followers.paginate(page: params[:page])
          render 'show_follow'
      end
    end

the helper

 module ApplicationHelper
   def page_header(text)
    content_for(:page_header) { text.to_s }
  end

  def gravatar_for(user, title = user.name, size = 30)
    image_tag gravatar_image_url(user.email, size: size), title: title, class: 'img-rounded'
  end
 end

问题是我如何将变量从部分传递给辅助方法？

Answer 1

正如您所指出的，错误在您的帮助器参数上：def gravatar_for(user, size = 30, title = user.name)。 user不是一个对象，它只是参数的名称，因此user.name无法工作。

尝试设置默认标题（1）或在调用方法（2）时传递标题：

def gravatar_for(user, size = 30, title = 'Default name')
<%= gravatar_for user, 20, user.name %>。每次重新排序参数时，为避免传递大小：def gravatar_for(user, title = user.name, size = 30)或使用keyword arguments。

将变量传递给部分变量

1 个答案: