通过回形针从URL保存图像

Question

请为我推荐一种通过回形针从URL保存图像的方法。

Answer 1

In Paperclip 3.1.4 it's become even simpler.

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. ie

self.picture = URI.parse("http://something.com/blah/avatar.png")

self.picture_file_name    # => "avatar.png"
self.picture_content_type # => "image/png"

Answer 2

Here is a simple way:

require "open-uri"

class User < ActiveRecord::Base
  has_attached_file :picture

  def picture_from_url(url)
    self.picture = open(url)
  end
end

Then simply :

user.picture_from_url "http://www.google.com/images/logos/ps_logo2.png"

Answer 3

It didn't work for me until I used "open" for parsed URI. once I added "open" it worked!

def picture_from_url(url)
  self.picture = URI.parse(url).open
end

My paperclip version is 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.

Answer 4

首先将带有curb宝石的图像下载到TempFile ，然后只需分配tempfile对象并保存模型。

Answer 5

As those are old Answer's here's a newer one:

Add Image Remote URL to your desired Controller in the Database

$ rails generate migration AddImageRemoteUrlToYour_Controller image_remote_url:string
$ rake db:migrate

Edit your Model

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.

Update your form, if you allow other to upload an Image from a URL

<%= f.input :image_remote_url, label: "Enter a URL" %>

Answer 6

It may helpful to you. Here is the code using paperclip and image present in remote URL .

require 'rubygems'
require 'open-uri'
require 'paperclip'
model.update_attribute(:photo,open(website_vehicle.image_url))

In model

class Model < ActiveRecord::Base
  has_attached_file :photo, :styles => { :small => "150x150>", :thumb => "75x75>" }
end

Answer 7

This is a hardcore method:

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.

Answer 8

Into official documentation is reported here 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:

user.picture = URI.parse(url)

It raise an error, in particular this error is raised:

Paperclip::AdapterRegistry::NoHandlerError: No handler found for #<URI:: ...

The new correct syntax is this one:

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.rb file:

Paperclip::DataUriAdapter.register
Paperclip::HttpUrlProxyAdapter.register

Tested this with paperclip version 5.3.0 and it works.