回形针找不到用于"file.jpg"的处理程序栏杆4 [英] paperclip No handler found for "file.jpg" rails 4

问题描述

我在其中一个应用程序中设置回形针gem时遇到问题.
尝试保存上传的文件时，出现No handler found for错误消息.

I'm having problem with setting up paperclip gem in one of me apps.
I get No handler found for error message when i try to save uploaded file.

我所做的事情

• 迁移:

• migration:

add_attachment :orders, :file  

型号:

model:

has_attached_file :file  
validates_attachment_content_type :file, :content_type => /\Aimage\/.*\Z/

控制器:

controller:

def order_params  
  params.require(:order).permit(:file)

视图:

view:

form_tag url, method: :post, html: {multipart: true}  
...  
= file_field_tag 'order[file]', disabled: true, id: 'mtd_file',accept: 'image/png,image/gif,image/jpeg'

当我尝试在控制器Order.create params[order]中执行时，出现错误

When I try to execute in my controller Order.create params[order] I get error

未找到"file.jpg"处理程序

No handler found for "file.jpg"

当我查看order[file]参数时，我看到它是一个字符串file.jpg(上传文件的名称).

When I look into order[file] param I see that it's a string file.jpg (name of uploaded file).

推荐答案

尝试使用下面的代码行，您不必将mulitpart作为html哈希传递

Try using the below line of code, you don't have to pass mulitpart as html hash

form_tag url, method: :post, multipart: true

对于form_for，您必须在html哈希中传递multipart

For form_for you have to pass multipart in html hash

form_for(@user), :html => { :multipart => true } do |f|

有关更多信息，您可以参考文档: RailsGuides-表单助手-5上传文件

For more info, you can refer to the documentation: RailsGuides - Form Helpers - 5 Uploading Files

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