在 Rails 中将数据从一个视图传输到另一个视图答案

【问题标题】：Transferring data from one view to another in Rails在 Rails 中将数据从一个视图传输到另一个视图
【发布时间】：2017-05-02 11:53:11
【问题描述】：

我是 Rails 新手，正在制作一个电子商务网站。这就是我的观点的代码（这是代码的一部分，而不是全部）：-

<% @thriller.each do |book|%>
  <div class="thumbnail">
    <img src="http://placehold.it/320x150" alt="">
    <div class="caption">
      <h4 class="pull-right"><%=book.mrp%></h4>
      <h4><a href="#"><%=book.book_name%></a>
      </h4>
    </div>
    <p>No. of pages:<%=book.pages%></p>
    <br>
    <p>In stock:<%=book.stock %></p>
    <br>
    <p>Synopsis:<%=book.synopsis %></p>
    <br>
    <p>Author:<%=book.author %></p>
    <br>
    <p>Publisher:<%=book.publisher %></p>
    <br>
    <p>Genre:<%=book.genre_name%></p>
    <br>
    <br>
    <div class="ratings">
      <p>
        <span class="glyphicon glyphicon-star"></span>
        <span class="glyphicon glyphicon-star"></span>
        <span class="glyphicon glyphicon-star"></span>
        <span class="glyphicon glyphicon-star"></span>
      </p>
    </div>
  </div>
<% end %>
</div>

<div class="col-sm-4 col-lg-4 col-md-4">
  <% @classic.each do|book|%>
    <div class="thumbnail">
      <img src="http://placehold.it/320x150" alt="">
      <div class="caption">
        <h4 class="pull-right"><%=book.mrp%></h4>
        <h4><a href="#"><%=book.book_name%></a></h4>
      </div>
      <p>No. of pages:<%=book.pages%></p>
      <br>
      <p>In stock:<%=book.stock %></p>
      <br>
      <p>Synopsis:<%=book.synopsis %></p>
      <br>
      <p>Author:<%=book.author %></p>
      <br>
      <p>Publisher:<%=book.publisher %></p>
      <br>
      <p>Genre:<%=book.genre_name%></p>
      <br>
      <br>
        <div class="ratings">
          <p>
            <span class="glyphicon glyphicon-star"></span>
            <span class="glyphicon glyphicon-star"></span>
            <span class="glyphicon glyphicon-star"></span>
            <span class="glyphicon glyphicon-star"></span>
          </p>
        </div>
    </div>
  <% end %>
</div>

用于此的控制器具有以下代码：-

class ShopController < ApplicationController
  def accessories
    @ntbk=Notebook.all
    @bkmk=Bookmark.all
  end

  def books
    @thriller=Book.where(genre_id:1)
    @classic=Book.where(genre_id:2)
    @romance=Book.where(genre_id:3)
    @selfhelp=Book.where(genre_id:4)
    @autob=Book.where(genre_id:5)
  end
end

我希望用户能够单击按钮并被重定向到显示该特定项目详细信息的页面。我该怎么做呢？

控制台日志：-

Processing by ShopController#view as 
  Book Load (0.2ms)  SELECT  "books".* FROM "books" WHERE "books"."book_id" IS NULL LIMIT ?  [["LIMIT", 1]]
  Rendering shop/view.html.erb within layouts/application
  Rendered shop/view.html.erb within layouts/application (5.2ms)
Completed 500 Internal Server Error in 14ms (ActiveRecord: 0.2ms)



ActionView::Template::Error (undefined method `each' for nil:NilClass):
    1: <% @book.each do|book|%>
    2: <p>Name:<%=@book.book_name%></p>
    3: <br>
    4: <p>No. of pages:<%=@book.pages%></p>

app/views/shop/view.html.erb:1:in `_app_views_shop_view_html_erb__1842756845584902456_69979582064500'
  Rendering /home/gauri/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/actionpack-5.0.2/lib/action_dispatch/middleware/templates/rescues/template_error.html.erb within rescues/layout
  Rendering /home/gauri/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/actionpack-5.0.2/lib/action_dispatch/middleware/templates/rescues/_source.html.erb
  Rendered /home/gauri/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/actionpack-5.0.2/lib/action_dispatch/middleware/templates/rescues/_source.html.erb (4.7ms)
  Rendering /home/gauri/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/actionpack-5.0.2/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb
  Rendered /home/gauri/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/actionpack-5.0.2/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb (1.8ms)
  Rendering /home/gauri/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/actionpack-5.0.2/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb
  Rendered /home/gauri/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/actionpack-5.0.2/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb (0.7ms)
  Rendered /home/gauri/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/actionpack-5.0.2/lib/action_dispatch/middleware/templates/rescues/template_error.html.erb within rescues/layout (23.0ms)

【问题讨论】：

搜索'link_to'标签以及如何使用它。
另请阅读模型资源路由，它为您提供了 7 个常用的默认 crud 请求。提示：你会在那里得到答案。
您发布的视图是索引操作？
@HarryBomrah 是的。

标签： ruby-on-rails ruby model-view-controller

【解决方案1】：

将上述代码部分替换为：

<% @thriller.each do |book|%>
  <div class="thumbnail">
    <img src="http://placehold.it/320x150" alt="">
    <div class="caption">
      <h4 class="pull-right"><%=book.mrp%></h4>
      <h4><%=link_to book.book_name, book_path(book.id)%>
      </h4>
    </div>
    <p>No. of pages:<%=book.pages%></p>
    <br>
    <p>In stock:<%=book.stock %></p>
    <br>
    <p>Synopsis:<%=book.synopsis %></p>
    <br>
    <p>Author:<%=book.author %></p>
    <br>
    <p>Publisher:<%=book.publisher %></p>
    <br>
    <p>Genre:<%=book.genre_name%></p>
    <br>
    <br>
    <div class="ratings">
      <p>
        <span class="glyphicon glyphicon-star"></span>
        <span class="glyphicon glyphicon-star"></span>
        <span class="glyphicon glyphicon-star"></span>
        <span class="glyphicon glyphicon-star"></span>
      </p>
    </div>
  </div>
<% end %>
</div>

<div class="col-sm-4 col-lg-4 col-md-4">
  <% @classic.each do|book|%>
    <div class="thumbnail">
      <img src="http://placehold.it/320x150" alt="">
      <div class="caption">
        <h4 class="pull-right"><%=book.mrp%></h4>
        <h4><%=link_to book.book_name, book_path(book.id)%></h4>
      </div>
      <p>No. of pages:<%=book.pages%></p>
      <br>
      <p>In stock:<%=book.stock %></p>
      <br>
      <p>Synopsis:<%=book.synopsis %></p>
      <br>
      <p>Author:<%=book.author %></p>
      <br>
      <p>Publisher:<%=book.publisher %></p>
      <br>
      <p>Genre:<%=book.genre_name%></p>
      <br>
      <br>
        <div class="ratings">
          <p>
            <span class="glyphicon glyphicon-star"></span>
            <span class="glyphicon glyphicon-star"></span>
            <span class="glyphicon glyphicon-star"></span>
            <span class="glyphicon glyphicon-star"></span>
          </p>
        </div>
    </div>
  <% end %>
</div>

如果您的 show 中没有 show 操作，请使用以下代码：

class BooksController < ApplicationController
  def show
    @book=Book.find(params[:id])
  end
end

如果您编写上述代码，则必须使用以下代码在您的 views/books 文件夹中创建一个名为 show.html.erb 的视图。

<p>Name:<%=@book.book_name%></p>
<br>
<p>No. of pages:<%=@book.pages%></p>
<br>
<p>In stock:<%=@book.stock %></p>
<br>
<p>Synopsis:<%=@book.synopsis %></p>
<br>
<p>Author:<%=@book.author %></p>
<br>
<p>Publisher:<%=@book.publisher %></p>
<br>
<p>Genre:<%=@book.genre_name%></p>
<br>

【讨论】：

首先，非常感谢。其次，有这个错误：Couldn't find Book with 'id'=
你能从你的终端/命令提示符显示服务器日志吗？
是的。我已将其发布在原始问题中！
首先，您需要删除 line#1 <% @book.each do|book|%> 并且您可能将 <%end%> 作为最后一行（也删除）
转到新终端。并输入命令rails c 然后运行命令Book.first 并共享输出

【解决方案2】：

你可以使用

<%= link_to book.book_name, shop_path(book) %>

这仅在您的 show 方法位于 shop_controller.rb 中时才有效。

【讨论】：

它不工作。我收到错误消息：undefined method book_name for nil:NilClass
对不起，它不是@book，只有book，因为它在循环中。我已经更新了代码。
好的，我应该如何制作另一个视图。详细信息被转移到的那个？我基本上希望能够显示所有正在显示的数据。
你最好阅读教程，因为它非常详细，我无法在这里解释整个事情。请阅读教程，如果您有疑问，可以在这里提问。