ruby-on-rails - rails ，复选框

Question

我不知道如何返回检查值。有我的代码

controller:

  def index

    // there I would like to get checked cities

    respond_to do |format|
      format.html # index.html.erb
      format.xml  { render :xml => @cities }
    end

  end


viewer:

  <%= render 'form' %>


_form:

  <% for cities in Database.find(:all) %>
  <div>
    <%= check_box_tag cities.city1 %>
    <%= cities.city1 %>
  </div>
  <% end %>

编辑

我试过了:

@cities = Database.find(:all)
params[:cities].each do |city|
  ...
end

和

<% for city in @cities %>
<%= check_box_tag "cities[]", city.id %> <%= city.city1 %>
<% end %>

但出现错误:

You have a nil object when you didn't expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.each

Answer 1

您好，通过复选框尝试，您的问题似乎与 HABTM 相似

<%form_tag "some_action", :method => :post do %>
  <% Database.find(:all).each do |city| %>
    <div>
      <%= check_box_tag "cities[]",city.city1, :false %>
      <%= citiy.city1 %>
    </div>
  <% end %>
<%end%>

和内部 Controller

def some_action
  if !request.post?
    @cities = Database.find(:all)
    render 'view'
  else
    params[:cities].each do |city|
      ...
    end
    redirect_to view_path
  end
end