使用 Rails 4 上的 Paperclip 从外部 url 上传图像的正确方法是什么? [英] Which is the proper way to upload an image from an external url with Paperclip on rails 4?

问题描述

我想将图像从 url 下载到模型:我已经阅读了通过回形针保存 URL 中的图像但首先我遇到了这个错误:

I want to download to a MOdel the image from an url: I already read Save image from URL by paperclip but first I run into this error:

    Paperclip::Error: Page model missing required attr_accessor for 'picture_file_name'

之后，我添加了 attr_accessible 参数并遇到了另一个错误:

afterwards , I added the attr_accessible parameter and run into this other error:

    RuntimeError: `attr_accessible` is extracted out of Rails into a gem

我现在还添加了protected_attributes，但没有成功..这就是我的模型现在的阅读方式:

I now added also the protected_attributes to no success.. This is how my model is reading right now:

require 'open-uri'
class Page < ActiveRecord::Base
has_attached_file :picture

#Get the picture from a given url.
def save_picture_from_url()
    self.picture = URI.parse(self.image_url)
end
end

求解器

我找到了自己的解决方案.错误是在没有阅读 Paperclip 指南的情况下进行的.

I found my own solution. THe errors were do to proceeding without reading Paperclip's guide.

首先我必须安装 imagemagick

Firstly I had to install imagemagick

其次我必须为模型页面添加迁移以添加附件

Secondly I had to add a migration for the model Page to add the attachment

推荐答案

我找到了自己的解决方案.错误是在没有阅读 Paperclip 指南的情况下进行的.

I found my own solution. THe errors were do to proceeding without reading Paperclip's guide.

首先我必须安装 imagemagick

Firstly I had to install imagemagick

其次我必须为模型页面添加迁移以添加附件

Secondly I had to add a migration for the model Page to add the attachment

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