使用带有 Mongoid 和 Carrierwave 的 Rails3 以嵌套形式上传文件的问题

发布于 2024-09-10 21:13:16 字数 978 浏览 4 评论 0原文

我在将 SQLlite Rails 3 应用程序传输到 Mongoid Rails 3 应用程序时遇到问题。在 SQLlite 版本中，我可以轻松地将一个模型（“图像”）的图像上传表单（使用 Paperclip）包含在另一个模型（“产品”）的嵌套表单中。这是我的“新”产品表单：

  <%= form_for @product, :html => {:multipart => true} do |f| %>
     <% f.fields_for :images do |image_form| %>
       <%= f.label :productphoto %>
       <%= f.file_field :productphoto %><br />
    <% end %>
 <% end %>

这是“显示”视图：

    <% @product.images.each do |image| %>
      <%= image_tag image.productphoto.url(:gallerythumb) %><br />
    <% end %>

当我尝试在我的 Mongoid Rails 3 应用程序（使用 Carrierwave）中使用相同的产品视图时，我收到以下错误：

    TypeError in Stores#show: 
    can't convert nil into String
    <%= image_tag product.image.url(:gallerythumb) %>

我很确定我的模型在 Mongoid 中版本是正确的，因为如果我向“图像”模型添加一个字符串（如“名称”）并将其嵌套在“产品”表单中，它就可以工作。另外，我能够将图像上传到非嵌套模型表单中。

任何帮助将不胜感激！

原文

Im having a problem transferring an SQLlite Rails 3 app over to a Mongoid Rails 3 app. In the SQLlite version, I am easily able to include an image upload form (using Paperclip) from one model ('image') within a nested form from another model ('product'). Here's my 'new' product form:

  <%= form_for @product, :html => {:multipart => true} do |f| %>
     <% f.fields_for :images do |image_form| %>
       <%= f.label :productphoto %>
       <%= f.file_field :productphoto %><br />
    <% end %>
 <% end %>

And here's the 'show' view:

    <% @product.images.each do |image| %>
      <%= image_tag image.productphoto.url(:gallerythumb) %><br />
    <% end %>

When I try to use the same product views in my Mongoid Rails 3 app (using Carrierwave), I get the following error:

    TypeError in Stores#show: 
    can't convert nil into String
    <%= image_tag product.image.url(:gallerythumb) %>

Im pretty sure my models in the Mongoid version are correct because if I add a string (like 'name') to my 'image' model and nest that in the 'Product' form, it works. Also, Im able to upload an image into a non-nested model form.

Any help would be greatly appreciated!

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大海や 2024-09-17 21:13:16

我自己也遇到了类似的问题。我认为问题不是图像上传，而是 Rails 无法将 :images 识别为数组。如果您查看 fields_for 帮助器的 Rails 源代码，您会发现它检查方法“_attributes=”。如果不存在，表单将作为普通字段而不是数组发布（参数将是“images”而不是“images[0]”）

您必须将以下行添加到模型中：

accepts_nested_attributes_for :images

I just had a similar problem myself. The problem is not the image upload I think, but the problem is that Rails doesn't recognize :images as being an Array. If you look into the Rails source of the fields_for helper you see that it checks for a method "_attributes=". If that's not there the form will be posted as normal fields and not as an array (params will be "images" instead of "images[0]")

You have to add the following line to your model: