S3上的Carrierwave上传和访问文件

Question

I am struggling to access files on S3 with Carrierwave.

In my uploader file doc_uploader.rb I have the following code

storage :file
def store_dir
"uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
end

to uplooad "doc" model defined as follow

class Doc < ActiveRecord::Base
belongs_to :user
mount_uploader :doc, DocUploader
end

To access the uploaded file I have the following line of code in a controller

@doc = current_user.docs.order("created_at").last #last file uploaded by user
io = open("#{Rails.root}/public" + @doc.doc.url)

Everything works perfectly locally. Now I want to move my file to S3 in the uploader I use fog and replace

storage :file

by

storage :fog

I adjust my config file carrierwave.rb and uploading works perfectly . However, to access the file I try to use

@doc = current_user.docs.order("created_at").last
io = open("#{@doc.doc.url}")

and I get the following error

No such file or directory @ rb_sysopen - /uploads/doc/doc/11/the_uploaded_file.pdf

Could anyone give me the right syntax to access the file on S3 please? Thanks.

Answer 1

When accessing the asset through the console, it gives you only the path, you might need to append the protocol & host to the @doc.doc.url , something like:

io = open("http://example.com#{@doc.doc.url}")

Or you can set the asset url on the environment you need to, but this is not really necessary:

 config.asset_host = 'http://example.com'

This only applies if you are using the console, on any web view this will not apply, carrierwave seems to handle it