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Tag: paperclip (page 1 of 8)

Rails + Paperclip + Open-Uri – Downloading files from the internet and saving them with Paperclip

I don’t like hotlinking. Being dependent on someone‚Äôs else infrastructure makes me a bit worried. Especially when I don’t know who this “someone” is. That’s why I’ve decided to download all the images that users embed in comments. After download, I attach them with Paperclip to their comments. Thanks to that, I can be sure, that they will always be served from my own servers (also I can use them later for some fancy stuff).

Theoretically, to obtain this, we could do something like that:

# We will use open-uri to download embedded images
require "open-uri"

file = open(image_url)
current_comment.pictures.create!(file: file)

Unfortunately this will “almost” work. If we try to get the file url:

current_picture.file.url #=> '/images/pictures/12313/file.'

we’ll get it without an file extension. This happens, because open-uri creates a Tempfile without a file extension. Unluckily Paperclip uses file name to determine extension. To get around this issue, we need to create a new Tempfile with a valid extension and copy open-uri Tempfile content to newly created one:

# We will use open-uri to download embedded images
require "open-uri"

file = Tempfile.new ['', ".#{image_url.split('.').last}"]
file.binmode # note that our tempfile must be in binary mode
file.write open(image_url).read
file.rewind
file
current_comment.pictures.create!(file: file)

Update – Paperclip can do this on its own!

Posted by Aditya Sanghi (thanks a lot!):

current_comments.pictures.create!(file: URI.parse(image_url))

Although keep in mind, that you still need to handle 500, 404, etc errors (Paperclip can raise them).

Paperclip and Rspec: Stubbing Paperclip/ImageMagick to make specs run faster, but with image resolution validation

I always test my Paperclip stuff. Mostly because quite often, I need to ensure proper images resolution or other image-based conditions. Unfortunately, it takes some time, mostly because ImageMagick is performing resource consuming operations. Each resolution test needs to get valid image to determine width and height. After that, Paperclip will try to create all the thumbs and save them. This takes a lot of time! Luckily there’s a Quickerclip that stubs Paperclip methods, allowing it to run faster. There’s one small issue with this code: it stubs the image, so there’s no way to test resolution validations. In order to make it work, but without any additional callbacks and without images converting, we need to stub two things:

First the Paperclip.run method:

# We stub some Paperclip methods - so it won't call shell slow commands
# This allows us to speedup paperclip tests 3-5x times.
module Paperclip
  def self.run cmd, params = "", expected_outcodes = 0
    cmd == 'convert' ? nil : super
  end
end

This will ignore convert command, so thumbnails won’t be created on save.

Also we need to stub the Paperclip::Attachment.post_process:

class Paperclip::Attachment
  def post_process
  end
end

Don’t forget to add this to your spec_helper or test_helper file!

After that, your tests/specs should run 3-5x times faster (it depends on how heavily you app is Paperclip based.

UPDATE FOR PAPERCLIP > 3.5.2
For Paperclip newer than 3.5.2 please use code presented below:

module Paperclip
  def self.run cmd, arguments = "", interpolation_values = {}, local_options = {}
    cmd == 'convert' ? nil : super
  end
end

class Paperclip::Attachment
  def post_process
  end
end
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