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Shortener makes it easy to create shortened URLs for your rails application.

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= Shortener

Shortener is a Rails Engine Gem that makes it easy to create and interpret shortened URLs on your own domain from within your Rails application. Once installed Shortener will generate, store URLS and "unshorten" shortened URLs for your applications visitors, all whilst collecting basic usage metrics.

== Overview

The majority of the Shortener consists of three parts:

  • a model for storing the details of the shortened link;
  • a controller to accept incoming requests and redirecting them to the target URL;
  • a helper for generating shortened URLs from controllers and views.

=== Dependencies

Shortener is designed to work from within a Ruby on Rail applications. It has dependancies Rails core components like ActiveRecord, ActionController, the rails routing engine and more.

=== Ruby Version Support

As Ruby 1.9.3 entered end of maintainance in early 2015, the last version of the Shortener gem to support Ruby 1.9.3 is 0.4.x. Shortener v0.5 onwards will require Ruby 2+.

=== Upgrading

==== v0.4.0 to v0.5.0 There have been some breaking changes: 1. The owner argument is passed into the generator and helper methods as a named parameter. 2. Original URLs arguments without a hypertext protocol (http|https) will be assumed to be relative paths.

=== v0.5.1 to v0.5.2 v0.5.2 introduced the ability to set an expiration date for a shortened URL. The expiration dates are stored in a expires_at column in the database, which can be added to your schema with the following migration:

class AddExpiresAtToShortenedUrl < ActiveRecord::Migration[4.2] def change addcolumn :shortenedurls, :expires_at, :datetime end end

=== v0.5.6 to v0.6.1 v0.6.1 introduced the ability to categorize a shortened URL. The category value is stored in a string column in the database, which must be added to your schema with the following migration:

bundle exec rails g migration addcategorytoshortenedurl category:string:index

class AddCategoryToShortenedUrl < ActiveRecord::Migration[4.2] def change addcolumn :shortenedurls, :category, :string addindex :shortenedurls, :category end end

=== Some niceities of Shortener:

  • The controller does a 301 redirect, which is the recommended type of redirect for maintaining maximum google juice to the original URL;
  • A unique alphanumeric code of generated for each shortened link, this means that we can get more unique combinations than if we just used numbers;
  • The link records a count of how many times it has been “un-shortened”;
  • The link can be associated with a user, this allows for stats of the link usage for a particular user and other interesting things;

== Installation

Shortener is compatible with Rails v4, v5, & v6. To install, add to your Gemfile:

gem 'shortener'

After you install Shortener run the generator:

rails generate shortener

This generator will create a migration to create the shortened_urls table where your shortened URLs will be stored.

Note: The default length of the url field in the generated migration is 2083. This is because MySQL requires fixed length indicies and browsers have a defacto limit on URL length. This may not be right for you or your database. The discussion can be seen here

Then add to your routes:

get '/:id' => "shortener/shortened_urls#show"

== Configuration The gem can be configured in a config/initializers/shortener.rb file.

By default, the shortener will generate keys that are 5 characters long. You can change that by specifying the length of the key like so;

Shortener.uniquekeylength = 6

By default, when a unique key isn't matched the site is redirected to "/". You can change that by specifying a different url like so;

Shortener.default_redirect = ""

By default, Shortener will generate unique keys using numbers and lowercase a-z. If you desire more combinations, you can enable the upper and lower case charset, by including the following:

Shortener.charset = :alphanumcase

If you want to use a custom charset, you can create your own combination by creating an array of possible values, such as allowing underscore and dashes:

Shortener.charset = ("a".."z").toa + (0..9).toa + ["-", "_"]

By default, Shortener assumes URLs to be valid web URLs and normalizes them in an effort to make sure there are no duplicate records generated for effectively same URLs with differences of only non-effective slash etc. You can control this option if it interferes for any of your logic. One common case is for mobile app links or universal links where normalization can corrupt the URLs of form appname://some_route

Shortener.autocleanurl = true

== Usage

To generate a Shortened URL object for the URL "" within your controller / models do the following:


Alternatively, you can create a shortened url to a relative path within your application:


To generate and display a shortened URL in your application use the helper method:


Pass in subdomain, protocol and other options that the UrlHelper url_for accepts:

shorturl("", urloptions: { subdomain: 'foo', host: 'bar', protocol: 'https' } )

This will generate a shortened URL. store it to the db and return a string representing the shortened URL.

=== Shortened URLs with owner

You can link shortened URLs to an owner, to scope them. To do so, add the following line to the models which will act as owners:

class User < ActiveRecord::Base hasshortenedurls end

This will allow you to pass the owner when generating URLs:

Shortener::ShortenedUrl.generate("", owner: user)

short_url("", owner: user)

And to access those URLs:


=== Shortened URLs with custom unique key

You can pass in your own key when generating a shortened URL. This should be unique.

Important: Custom keys can't contain characters other than those defined in Shortener.charset. Default is numbers and lowercase a-z (See Configuration).

Shortener::ShortenedUrl.generate("", owner: user, custom_key: "mykey")

shorturl("", customkey: 'yourkey')

=== Expirable Shortened URLs

You can create expirable URLs. Probably, most of the time it would be used with owner:

Shortener::ShortenedUrl.generate("", user, expires_at: 24.hours.since)

You can omit owner passing nil instead:

Shortener::ShortenedUrl.generate("", nil, expires_at: 24.hours.since)

=== Fresh Links

Sometimes you just need that feeling of a fresh, untouched Shortened URL. By default, Shortener will find an existing ShortenedUrl record for a supplied URL. If you want to create a fresh record, you can pass the following argument:

Shortener::ShortenedUrl.generate("", fresh: true) short_url("", fresh: true)

=== Forbidden keys

You can ensure that records with forbidden keys will not be generated. In Rails you can put next line into config/initializers/shortener.rb

Shortener.forbidden_keys.concat %w(terms promo)

=== Ignoring Robots

By default Shortener will count all visits to a shortened url, including any crawler robots like the Google Web Crawler, or Twitter's link unshortening bot. To ignore these visits, Shortener makes use of the excellent voight_kampff gem to identify web robots. This feature is disabled by default. To enable add the following to your shortener configuration:

Shortener.ignore_robots = true

=== Mounting on a Subdomain

If you want to constrain the shortener route to a subdomain, the following config will prevent the subdomain parameter from leaking in to shortened URLs if it matches the configured subdomain.

Within config/initializers/shortener.rb

Shortener.subdomain = 's'

Within config/routes.rb

constraints subdomain: 's' do get '/:id' => "shortener/shortened_urls#show" end

=== URL Parameters

Parameters are passed though from the shortened url, to the destination URL. If the destination URL has the same parameters as the destination URL, the parameters on the shortened url take precedence over those on the destination URL.

For example, if we have an orginal URL of: (identified with token ABCDEF) Which is shortened into: Then, the resulting URL will be: Note how the test parameter takes the value given on the short URL.

=== Shorten URLs in generated emails

You can register the included mail interceptor to shorten all links in the emails generated by your Rails app. For example, add to your mailer:

class MyMailer < ActionMailer::Base register_interceptor end

This will replace all long URLs in the emails generated by MyMailer with shortened versions. The base URL for the shortener will be infered from the mailer's defaulturloptions. If you use a different hostname for your shortener, you can use:

class MyMailer < ActionMailer::Base registerinterceptor :baseurl => "" end

The interceptor supports a few more arguments, see the implementation for details.

=== Logging, stats and other tricks

If you want more things to happen when a user accesses one of your short urls, you can create your own

action as follows:
def show
  token = ::Shortener::ShortenedUrl.extract_token(params[:id])
  url   = ::Shortener::ShortenedUrl.fetch_with_token(token: token, additional_params: params)
  # do some logging, store some stats
  redirect_to url[:url], status: :moved_permanently

=== Fetch with Token The

::Shortener::ShortenedUrl.fetch_with_token(token: token, additional_params: params)
does the following: 1. finds the ShortenedUrl for the supplied token 2. increments the usecount for the retrieved ShortenedURL 3. combines the additional parameters with the URL in the retrieved ShortenedURL 4. returns a hash of the format `{url: , shortenedurl: }

note: If no shortened URL is found, the url will be


=== Configuring a different database for shortened_urls table

You can store a

table in another database and connecting to it by creating a initializer with the following:
ActiveSupport.on_load(:shortener_record) do
  connects_to(database: { writing: :dbname, reading: :dbname_replica })

Note: Please, replace

to match your database configuration.

== Origins

For a bit of backstory to Shortener see this {blog post}[].

== In The Wild

Shortener is used in a number of production systems, including, but not limited to:

  • {Doorkeeper - An Event Management Tool}[]
  • {1001tweets - Repost your tweets to get more clicks}[]
  • { - The curated newsletter builder}[]

If you are using Shortener in your project and would like to be added to this list, please get in touch!

== Contributing

We welcome new contributors. Because we're all busy people, and because Shortener is used/relied upon by many projects, it is essential that new Pull Requests are opened with good spec coverage, and a passing build on supported ruby versions and Rails versions.

To contribute:

  1. Fork it
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Write spec coverage of changes
  4. Commit your changes (git commit -am 'Add some feature')
  5. Push to the branch (git push origin my-new-feature)
  6. Create a new Pull Request
  7. Ensure the build is passing

Note: We adhere to the community driven Ruby style guide:

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