如何在rails 3中获得选择值

Question

我想知道如何获得<select>的选定值。我只知道如何填充这个

这是我的代码在 index.html.erb 。我用它来填充<select>下拉菜单。

<h1>Trap</h1>
<%= form_for @search do |f| %>
 <p>
  Employee Code: 
  <%= f.select(:empcode_contains, @employee.collect {|e| [ e.empcode,   e.id ]})  %>
 </p>
 <p class="button"><%= f.submit "Search" %></p>
<% end %>
<p>
 Sort by:
 <%= sort_link @search, :empcode %> |
 <%= sort_link @search, :date_entry %> |
</p>
<table>
 <tr>
  <th>Empcode</th>
  <th>Date entry</th>
  <th></th>
  <th></th>
  <th></th>
 </tr>
<% @traps.each do |trap| %>
 <tr>
  <td><%= trap.empcode %></td>
  <td><%= trap.date_entry %></td>
  <td><%= link_to 'Show', trap %></td>
  <td><%= link_to 'Edit', edit_trap_path(trap) %></td>
  <td><%= link_to 'Destroy', trap, :confirm => 'Are you sure?', :method => :delete %></td>
 </tr>
<% end %>
</table>
<br />
<%= link_to 'New Trap', new_trap_path %>

控制器 traps_controller.rb :

def index
 @search = Trap.search(params[:search])
 @traps = @search.all
 @employee = Employee.all
 Trap.all.each do |t|
   Employee.create(:empcode => t.empcode)
 end
 respond_to do |format|
  format.html # index.html.erb
  format.xml  { render :xml => @traps }
 end
end

请告诉我如何获得所选的值，如果用户选择一个值。我不知道。

Answer 1

Try(在控制器中):

value = params[:empcode_contains]

或者你可以这样获取整个对象:

search = params[:search]