Extract subset of string in Ruby on Rails

Question

In my Ruby application, I have a file upload that I've set up with AWS. When displaying uploaded files back to the user, I would like to display only the name of the uploaded file, not the entire file.

In my view, I'm using:

<td>
    <%= link_to file.file_url.split('/').last, file.file_url, target: '_blank' %>
</td>

Which outputs something like File_name.pdf instead of https://bucket_name.s3-us-west.../file_name.pdf, which is exactly what I need.

However, for certain file uploads, there are parameters appended to the file name, so I get something like File_name.pdf?AWSAccessKeyID=1234&Expires=1234. When displayed in a view, that looks ugly as hell.

I would like to split file URL string at the last trailing slash, and then again at the "?". I've tried slash and chomp but can't seem to format it correctly. Is that the appropriate approach?

Tom Gasaner · Accepted Answer · 2015-09-06 15:52:39Z

3

You should probably create a helper which will take file.file_url and convert it to "File_name.pdf", it will look like this:

def aws_file_name(url)
  uri = URI.parse(url) # =>  #<URI::HTTPS https://bucket_name.s3-us-west/.../File_name.pdf?AWSAccessKeyID=1234&Expires=1234>
  File.basename(uri.path) # => "File_name.pdf"
end

Then:

<%= link_to aws_file_name(file.file_url), file.file_url, target: '_blank' %>

answered Sep 6, 2015 at 15:52

Tom Gasaner

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Comments

user3946265 · Accepted Answer · 2015-09-06 15:48:36Z

0

new_str = str.slice(0..(str.index('?'))) will cut the filename after the first occurence of ?
where str is your current filename and new_str will be the cut version.

//edit
new_str will still contain the ?
if you don't want this to happen then try using new_str = str.split('?')[0]

answered Sep 6, 2015 at 15:48

user3946265

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