在每个循环中使用Form_for [英] Using a Form_for with an each loop

问题描述

我正在尝试在Rails中创建一个表单，该表单允许用户使用复选框从较大的列表中选择某些照片。不幸的是，我还没有找到任何类似的例子，那里的大多数帖子都没有帮助。关于如何解决这个问题的任何想法？

I'm trying to create a form in Rails that allows a user to select certain photos from a larger list using checkboxes. Unfortunately, I haven't found any similar examples and most posts out there are unhelpful. Any ideas on how to solve this?

 <div>
  <%= form_for :photos, url: trip_path, method: "PUT"  do |f| %>
  <% @photos.each_with_index do |image, index|%>    
    <img src="<%= image.url %>" ><br>
      <span> <%=image.caption%> | <%=image.lat  %> | <%= image.long  %>
        <%= f.hidden_field "url", :value => image.url %>
        <%=check_box_tag('photo')  %>
      </span>
    <% end %>
    <%= f.submit 'Submit'  %>
  <% end %>
</div>

推荐答案

使用 form_form 。 但是，如果您愿意放弃 form_for （而且根据您的标准，没有理由不应该这样做），您可以模仿通过在 <$ c $内嵌套 foreach 循环（每个循环包含 form_for 块）来描述的行为c> form_tag ：

The behavior you've depicted is categorically impossible using form_form. However, if you're willing to forgo form_for (and there's no reason why you shouldn't, given your criteria), you can imitate the behavior depicted by nesting a foreach loop – each loop containing a form_for block – within a form_tag:

<div>
    <%= form_tag trip_path, method: "PUT"  do |f| %>
        <% @photos.each do |photo|%>    
            <img src="<%= photo.url %>" ><br>
            <span> <%= photo.caption%> | <%= photo.lat  %> | <%= photo.long  %>
                <%= fields_for "photos[#{photo.id}]", photo do |p| %>
                    <%= p.hidden_field 'url', :value => photo.url %>
                    <%= p.check_box 'photo'
                <% end %>
            </span>
        <% end %>
        <%= f.submit 'Submit'  %>
    <% end %>
</div>

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