Ruby-on-rails 通过回形针从 URL 保存图像
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Save image from URL by paperclip
提问by khanh
Please suggest me a way to save an image from an URL by Paperclip.
请建议我一种通过 Paperclip 从 URL 保存图像的方法。
回答by Aditya Sanghi
In Paperclip 3.1.4 it's become even simpler.
在 Paperclip 3.1.4 中，它变得更加简单。
def picture_from_url(url)
self.picture = URI.parse(url)
end
This is slightly better than open(url). Because with open(url) you're going to get "stringio.txt" as the filename. With the above you're going to get a proper name of the file based on the URL. i.e.
这比 open(url) 稍微好一点。因为使用 open(url) 你会得到“stringio.txt”作为文件名。有了上面的内容，您将根据 URL 获得文件的正确名称。IE
self.picture = URI.parse("http://something.com/blah/avatar.png")
self.picture_file_name # => "avatar.png"
self.picture_content_type # => "image/png"
回答by Nicolas Blanco
Here is a simple way:
这是一个简单的方法：
require "open-uri"
class User < ActiveRecord::Base
has_attached_file :picture
def picture_from_url(url)
self.picture = open(url)
end
end
Then simply :
然后简单地：
user.picture_from_url "http://www.google.com/images/logos/ps_logo2.png"
回答by M?chael Makar?v
It didn't work for me until I used "open" for parsed URI. once I added "open" it worked!
直到我使用“open”来解析 URI，它才对我有用。一旦我添加了“打开”它就起作用了！
def picture_from_url(url)
self.picture = URI.parse(url).open
end
My paperclip version is 4.2.1
我的回形针版本是 4.2.1
Before open it wouldn't detect the content type right, because it wasn't a file. It would say image_content_type: "binary/octet-stream", and even if I override it with the right content type it wouldn't work.
在打开之前，它不会正确检测内容类型，因为它不是文件。它会说 image_content_type: "binary/octet-stream"，即使我用正确的内容类型覆盖它也不起作用。
回答by Ariejan
First download the image with the curbgem to a TempFileand then simply assign the tempfile object and save your model.
首先将带有curbgem的图像下载到 a TempFile，然后简单地分配临时文件对象并保存您的模型。
回答by Mini John
As those are old Answer's here's a newer one:
由于这些是旧答案，因此这里有一个较新的答案：
Add Image Remote URL to your desired Controller in the Database
将图像远程 URL 添加到数据库中所需的控制器
$ rails generate migration AddImageRemoteUrlToYour_Controller image_remote_url:string
$ rake db:migrate
Edit your Model
编辑您的模型
attr_accessible :description, :image, :image_remote_url
.
.
.
def image_remote_url=(url_value)
self.image = URI.parse(url_value) unless url_value.blank?
super
end
*In Rails4 you have to add the attr_accessible in the Controller.
*在 Rails4 中，您必须在控制器中添加 attr_accessible。
Update your form, if you allow other to upload an Image from a URL
更新您的表单，如果您允许其他人从 URL 上传图片
<%= f.input :image_remote_url, label: "Enter a URL" %>
回答by prabu
It may helpful to you. Here is the code using paperclip and image present in remote URL .
它可能对你有帮助。这是使用远程 URL 中存在的回形针和图像的代码。
require 'rubygems'
require 'open-uri'
require 'paperclip'
model.update_attribute(:photo,open(website_vehicle.image_url))
In model
在模型中
class Model < ActiveRecord::Base
has_attached_file :photo, :styles => { :small => "150x150>", :thumb => "75x75>" }
end
回答by Diego D
Into official documentation is reported here https://github.com/thoughtbot/paperclip/wiki/Attachment-downloaded-from-a-URL
进入官方文档在这里报道https://github.com/thoughtbot/paperclip/wiki/Attachment-downloaded-from-a-URL
Anyway it seems not updated, because in last version of paperclip something has changed and this line of code is no more valid:
无论如何它似乎没有更新，因为在上一个版本的回形针中有些东西已经改变，这行代码不再有效：
user.picture = URI.parse(url)
It raise an error, in particular this error is raised:
它引发了一个错误，特别是引发了这个错误：
Paperclip::AdapterRegistry::NoHandlerError: No handler found for #<URI:: ...
The new correct syntax is this one:
新的正确语法是这样的：
url = "https://www.example.com/photo.jpeg"
user.picture = Paperclip.io_adapters.for(URI.parse(url).to_s, { hash_digest: Digest::MD5 })
Also we need to add these lines into config/initializers/paperclip.rbfile:
我们还需要将这些行添加到config/initializers/paperclip.rb文件中：
Paperclip::DataUriAdapter.register
Paperclip::HttpUrlProxyAdapter.register
Tested this with paperclip version 5.3.0and it works.
用回形针版本对此进行了测试，5.3.0并且可以正常工作。
回答by Martin Streicher
This is a hardcore method:
这是一个核心方法：
original_url = url.gsub(/\?.*$/, '')
filename = original_url.gsub(/^.*\//, '')
extension = File.extname(filename)
temp_images = Magick::Image.from_blob open(url).read
temp_images[0].write(url = "/tmp/#{Uuid.uuid}#{extension}")
self.file = File.open(url)
where Uuid.uuid just makes some random ID.
其中 Uuid.uuid 只是制作一些随机 ID。
