Rails嵌套的带有图像的表格 [英] Rails Nested Forms With Images

问题描述

因此，我正在使用Campaigns模型和Sites模型(其中Campaigns具有多个站点)构建嵌套表单.在广告系列"表格中，我有:

So I'm building a nested form with an Campaigns model and a Sites model where Campaigns has_many Sites. In my Campaigns form I have:

<%= f.fields_for :sites do |builder| %>
    <%= render "site_fields", :f => builder %>
<% end %>

然后在_site_fields.html.erb中，我拥有:

And then in the _site_fields.html.erb I have:

<div class="field">
 <%= f.label :title %><br />
 <%= f.text_field :title %>
</div>
 <%= f.label "Image"%><br>
 <%= f.file_field :image %>
<div class="field">
 <%= f.label :url %><br>
 <%= f.text_field :url %>
</div>

这一切似乎都起作用(令人震惊)，但是我想预览已经为表单中的特定网站上传的图像.因此，在我有f.file_field:image的位置，我还希望能够显示该图像的预览.问题是我似乎无法访问正在渲染的当前站点，因为我正在使用f.fields_for.

This all seems to work (shockingly) but I would like to have a preview of the image already uploaded for a particular site in the form. So where I have f.file_field :image I would also like to be able to show a preview of that image. The problem is that I don't seem to be able to access the current site being rendered because I'm using f.fields_for.

有什么建议吗?我确定我缺少相对简单的东西.

Any suggestions? I'm sure I'm missing something relatively simple.

提前谢谢！

推荐答案

从表单帮助器对象(在您的情况下为 builder 和 f )，您应该可以访问模型对象和您要查找的网址，如下所示:

From the form helper object (in your case builder and f) you should be able to access the model object and the url your looking for like this:

<%= image_tag f.object.image_url(:thumb) %>

image _url中的 image 取决于您如何命名属性，但是对于您的示例来说，这应该是正确的.

The image in image_url depends on how you named the attribute, but for your sample this should be correct.

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