Paperclip 4，Amazon S3＆rspec：如何存根文件上传？

Question

I'm writing tests with rspec and am a bit struggling with Paperclip 4. At the moment I'm using webmock to stub requests but image processing is slowing tests down.

Everything I read suggest to use stubs like so:

Profile.any_instance.stub(:save_attached_files).and_return(true)

It doesn't work since :save_attached_files disappeared with Paperclip 4 as far as I can tell.

What's the proper way to do it now ?

Thanks

Answer 1

Add this to your rails_helper.rb in your config block:

RSpec.configure do |config|
  # Stub saving of files to S3
  config.before(:each) do
    allow_any_instance_of(Paperclip::Attachment).to receive(:save).and_return(true)
  end
end

Answer 2

It doesn't exactly answer my question, but I found a way to run faster specs thanks to this dev blog , so I'm posting it if it can help someone else.

Just add this piece of code at the beginning of your spec file or in a helper. My tests are running 3x faster now.

# 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
class Paperclip::Attachment
  def post_process
  end
end

Paperclip > 3.5.2

For newer versions of Paperclip, use the following:

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

Answer 3

I had a heckuva time dealing with this. I didn't want to test Paperclip per se -- rather, I needed a file to exist on my model so I can test a very sensitive custom class.

None of the other answers worked for me (Rails 5, Rspec 3.5) so I gave up on stubbing AWS or using the Paperclip::Shoulda::Matchers. Nothing worked and it ate up an entire day! Finally I gave up on Paperclip altogether and went this route:

list = build(:list)
allow(list).to receive_message_chain("file.url") { "#{Rails.root}/spec/fixtures/guess_fullname.csv" }
importer = Importer.new(list)
expect(importer.set_key_mapping).to eq({nil=>:email_address, :company=>:company, :fullname=>:full_name})

Where my models/list.rb has has_attached_file :file and Importer is a class I wrote that takes the file, which was already uploaded to S3 by paperclip before the class is initialized, and processes it. The file.url would otherwise be the S3 URL, so I give it the path in my repo to a testing csv file. set_key_mapping is a method in my class that I can use to verify the processing part worked.

Hope this saves somebody a few hours...

Answer 4

What about adding AWS.stub! in your spec/spec_helper.rb ? Give that a try.