rails 3 - paperclip - ruby-on-rails

With paperclip, how can you get paperclip to use full urls like http://mysite.com/image/asdasd.png
versus /image/asdad.png
thanks

Once you configure the :url interpolation string to your satisfaction, you can link to attachments with the full URL using something like:
def attachment_path(attachment)
attachment.url
end
def attachment_url(attachment)
"#{root_url}#{attachment.url.gsub(/^\//, '')}"
end

Assuming you want the behavior to work like the _url helpers on the controller/view level, its a little complicated as paperclip functions without the benefit of knowing the host from the request. An easy way to get around this is to define the constant HOST in the config/environments/ENV.rb and then passing the url parameter to has_attachment like
:url => "http://#{HOST}/:path"
or whatever your url rules are.
You can also side step this issue by using S3, which is kind of a life saver

If you are uploading files to amazon S3 then s3.url gives the full image path. But in case of local file storage, you can set :url option also

Related

carrierwave: point to existing image

In my rails app, I'm using Carrierwave to upload images on Amazon S3. I'd like to point to existing Amazon S3 images without having to re-upload the image. For example, if I have an existing Amazon S3 image at http://test.s3.amazonaws.com/image/path/0001/image.jpg, can I update an image's path to point to this image? I don't want to use the remote upload option because I really just want to use the same exact image that's already there (but save it in my record's "path" attribute).
In the console, I've tried:
image.update_attributes(:path=> "http://test.s3.amazonaws.com/image/path/0001/image.jpg")
but this fails to override the image's path.
Chiming in, better late than never! Caveat: This is for rails 4, and I am testing on rails 4.1 only at the moment.
This is harder than it should be, methinks! The reason this was absolutely crucial to me was that I am attaching 100MB+ MP3 files, which I cannot receive on my host, due to CloudFlare SSL limitations (and common sense). Fortunately, AWS supports preauthorized uploads, and I got carrierwave to do the right thing for me:
Step 1: get carrierwave to tell me where it would store a file if it could:
m.raw_write_attribute('file','file.mp3');
url = m.file.url
signed = aws_presigned_url(url)
raw_write_attribute does not save anything, it just bypasses carrierwave when setting the value. This makes the object act as if it read 'file.mp3' out of the database. Then you can ask Carrierwave "where the file lives". I then upload the file directly from the client to S3. When that's done, I make another API call to Rails, which performs the following code:
m.raw_write_attribute('file','file.mp3');
m.update_attribute('file','file.mp3');
These two paired get around Carrierwave. The first makes carrierwave think that the 'file' column is set to 'file.mp3', the second explicitly tells rails to persist 'file.mp3' to the DB. Because of the raw_write_attribute call, Carrierwave allows the second through un-changed.
In my case update_column and update_columns worked great:
model.update_columns file_1: 'filename.txt'
Update column is with comma:
model.update_column :file_1, 'filename.txt'
This will not run any callback and set column to filename.txt.
When I do model.file_1.url I get the right S3 URL.
I am a bit late to the party, but you can use Active Record's raw_write_attribute method something like:
#image.raw_write_attribute(:path, "http://test.s3.amazonaws.com/image/path/0001/image.jpg")
I found that you can actually do this, for example if your mount_uploader is :path, then:
image.remote_path_url = "http://test.s3.amazonaws.com/image/path/0001/image.jpg"
image.save

How and where paperclip via aws-sdk store URLs?

Sorry for maybe dumb question, but I have some misunderstanding about how Paperclip works. If I use it with aws-sdk gem, where image urls are stored?
My model has only fields like image_name, image_size, but not something like image_url. I also tried to list all tables from my db in sql console, but there wasn't any special image-related tables. I know what I can access url by calling my_model.image.url, but I need understanding, where this url is located.
Thanks.
The urls are auto generated based on the ruleset you have in your paperclip config file. They usually include the name and id of your model unless you have changed the defaults. Set the :default_url option when you call has_attached_file if you want to change it:
:default_url => '/images/:attachment/missing_:style.png',
:path => "avatars/:id/:style/:filename"
More background: rails paperclip default image with S3

How do you access the raw content of a file uploaded with Paperclip / Ruby on Rails?

I'm using Paperclip / S3 for file uploading. I upload text-like files (not .txt, but they are essentially a .txt). In a show controller, I want to be able to get the contents of the uploaded file, but don't see contents as one of its attributes. What can I do here?
attachment_file_name: "test.md", attachment_content_type: "application/octet-stream", attachment_file_size: 58, attachment_updated_at: "2011-06-22 01:01:40"
PS - Seems like all the Paperclip tutorials are about images, not text files.
In Paperclip 3.0.1 you could just use the io_adapter which doesn't require writing an extra file to (and removing from) the local file system.
Paperclip.io_adapters.for(attachment.file).read
#jon-m answer needs to be updated to reflect the latest changes to paperclip, in order for this to work needs to change to something like:
class Document
has_attached_file :revision
def revision_contents(path = 'tmp/tmp.any')
revision.copy_to_local_file :original, path
File.open(path).read
end
end
A bit convoluted as #jwadsack mentioned using Paperclip.io_adapters.for method accomplishes the same and seems like a better, cleaner way to do this IMHO.
To access the file you can use the path method:
csv_file.path
http://rdoc.info/gems/paperclip/Paperclip/Attachment#path-instance_method
This can be used along with for example the CSV reader.
Here's how I access the raw contents of my attachment:
class Document
has_attached_file :revision
def revision_contents
revision.copy_to_local_file.read
end
end
Please note, I've omitted my paperclip configuration options and any sort of error handling.
You would need to load the contents of the file (using Rubys File.open) into a variable before you show it. This may be an expensive operation if your app gets lots of use, so it may be worthwhile reading the contents of the file and putting it into a text column in your database after uploading it.
Attachment already inherits from IOStream. http://rdoc.info/github/thoughtbot/paperclip/master/Paperclip/Attachment
So it should just be "#{attachment}" or <% RDiscount.new(attachment).to_html %> or send_data(attachment). However you wanted to display the data.
This is a method I used for upload from paperclip to active storage and should provide some guidance on temporarily working with a file in memory. Note: This should only be used for relatively small files.
Written for gem paperclip 6.1.0
Where I have a simple model
class Post
has_attached_file :image
end
Working with a temp file in ruby so we do not have to worry about closing the file
Tempfile.create do |tmp_file|
post.image.copy_to_local_file(nil, tmp_file.path)
post.image_temp.attach(
io: tmp_file,
filename: post.image_file_name,
content_type: post.image_content_type
)
end

amazon s3 virtual hosting of bucket

I have uploaded a file on s3 using paperclip.. the file upload process works fine..
Now i wanted to download it. In my model i have set my :s3_host_alias.. now as the file is private.. so if i am trying to fetch the file using paperclip url method... it's giving me access denied error...
and if i am using S3Object.url_for method then the url return is s3.amazonaws.com/mybucket/path_of_file.
I don't want tht s3.amazonaws.com to be shown in the url so used :s3_host_alias in my model
and created a CNAME inmy DNS server... now if i am directly using #object.url then its giving the correct url but throws access denied error. because i guess the access_key and signature is not passed..
Is there a way to fetch private file from s3 using paperclip by using canonical url..
I don't use paperclip, but yes, you can sign a S3 request using a virtual hostname.
I had this problem using Paperclip and the AWS::S3 gem. Paperclip set up everything fine for non-authenticated requests. But falling back to AWS::S3 to generate an authenticated URL didn't use the S3 host alias.
You can pass AWS::S3 a server option on connect, but I didn't need or want a connection just to get the URL. I also couldn't see a way to set it via configuration (so it would apply outside of a connection). Even glancing at the source, it looks like it's non-configurable.
So, I created a monkey patch. My Ruby-fu (and maybe my OO-fu) aren't super high, so there may be a better way to do this, but it works for what I need. Basically, I pass url_for an :s3_host_alias param on the option hash, and then the monkey patch uses that if it's passed. If it's passed, it also has to remove the bucket from the path that's generated.
So....
You can create this 1-line file, RAILS_ROOT/initializers/load_patches.rb, to load all patches in RAILS_ROOT/lib:
Dir[File.join(Rails.root, 'lib', 'patches', '**', '*.rb')].sort.each { |patch| require(patch) }
Then create the file RAILS_ROOT/lib/patches/aws.rb with this code:
http://pastie.org/1622881
And you can call for an authenticated url with something along these lines (Configuration is a custom class for storing, natch, configuration values) :
AWS::S3::S3Object.url_for(media.path(style || media.default_style), media.bucket_name, :expires_in => expires_in, :use_ssl => false, :s3_host_alias => Configuration.s3_host_alias)

How Rails be configured to access a media resource that is not in its conventional directory location?

Let's say I have an image that does not reside in the normal location:
{appname}/public/images/unconventional.gif
But instead here:
{appname}/unconventional.gif
I understand this is a complete violation of Rails conventions, is immoral and you should never do this under any circumstances and, furthermore, why would I even suggest such a foolish thing?
Ok, now that we have that out of the way, assuming I am on Windows and therefore symbolic links are out of the question, how is it possible to set this up?
Rails does not serve these images, it lets the web server do that. You had best change the configuration of your web server to handle this scenario. If you use Apache, for example, it would fairly easy to set up with mod_rewrite.
Making Rails serve these images will be ugly, but it is possible if you provide a route in your routes.rb that matches /public/images/unconventional.gif, and if the file itself does not exist. For example:
map.connect "public/images/unconventional.gif",
:controller => "static_image_controller",
:action => "serve"
And then create a controller StaticImageController:
class StaticImageController < ApplicationController
def serve
image = File.read(File.join(Rails.root, "unconventional.gif"))
send_data image, :type => "image/gif", :disposition => "inline"
end
end
Warning: if you use the above concept, note that if you use input from the URL to decide which file to serve (with params[:file], for example), you need to thoroughly sanitize the input, because you are risking exposing your entire file system to the outside world.

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