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以下是索引操作的一段代碼。有人可以解釋我使用第三個參數:class =>'action show',在行號27,28和29的link_to助手中。如果沒有這個,代碼似乎也能正常工作。我是一名鐵桿菜鳥,並提前致謝。link_to方法中的額外參數
<div class="subjects index">
<h2>Subjects</h2>
<%= link_to("Add New Subject", '#', :class => 'action new') %>
<table class="listing" summary="Subject list">
<tr class="header">
<th> </th>
<th>Subject</th>
<th>Visible</th>
<th>Pages</th>
<th>Actions</th>
</tr>
<% @subjects.each do |subject| %>
<tr>
<td><%= subject.position %></td>
<td><%= subject.name %></td>
<td class="center"><%= subject.visible ? 'Yes' : 'No' %></td>
<td class="center">
<%if(subject.pages!=nil)%>
<%= subject.pages.size %>
<% else %>
<%= "1" %>
<% end %>
</td>
<td class="actions">
<%= link_to("Show", {:action => "show",:id => subject.id}, :class => 'action show') %>
<%= link_to("Edit", '#', :class => 'action edit') %>
<%= link_to("Delete", '#', :class => 'action delete') %>
</td>
</tr>
<% end %>
</table>
</div>