rails 2:6.1.4.6+dfsg-2ubuntu1 source package in Ubuntu

 Rails is a full-stack, open-source web framework in Ruby for writing
 real-world applications.
 .
 Being a full-stack framework means that all layers are built to work
 seamlessly together. That way you don't repeat yourself and you can
 use a single language from top to bottom. Everything from templates to
 control flow to business logic is written in Ruby.
 .
 This is a metapackage.

 Action Cable seamlessly integrates WebSockets with the rest of your Rails
 application. It allows for real-time features to be written in Ruby in the same
 style and form as the rest of your Rails application, while still being
 performant and scalable. It's a full-stack offering that provides both a
 client-side JavaScript framework and a server-side Ruby framework. You have
 access to your full domain model written with Active Record or your ORM of
 choice.

 Action Mailbox routes incoming emails to controller-like mailboxes for
 processing in Rails. It ships with ingresses for Mailgun, Mandrill,
 Postmark, and SendGrid. It provides the way for handling inbound mails
 directly via the built-in Exim, Postfix, and Qmail ingresses.

 Action Mailer is a framework for working with email on Rails.
 Compose, deliver, and test emails using the familiar controller/view
 pattern. First-class support for multipart email and attachments.

 Action Pack is a framework for web apps on Rails. Simple,
 battle-tested conventions for building and testing MVC web
 applications. Works with any Rack-compatible server.

 Action Text brings rich text content and editing to Rails. It includes
 the Trix editor that handles everything from formatting to links to
 quotes to lists to embedded images and galleries.

 Action View is a framework for handling view template lookup and
 rendering, and provides view helpers that assist when building HTML
 forms, Atom feeds and more. Template formats that Action View handles
 are ERB (embedded Ruby, typically used to inline short Ruby snippets
 inside HTML), and XML Builder.

 Active Job is a framework for declaring jobs and making them run on a variety
 of queueing backends. These jobs can be everything from regularly scheduled
 clean-ups, to billing charges, to mailings. Anything that can be chopped up
 into small units of work and run in parallel.

 Active Model is a toolkit for building modeling frameworks like
 Active Record and Active Resource. This includes a rich support for
 attributes, callbacks, validations, observers, serialization,
 internationalization, and testing.

 Active Records is a framework to work with databases on Rails. Build
 a persistent domain model by mapping database tables to Ruby classes.
 Strong conventions for associations, validations, aggregations,
 migrations, and testing come baked-in.

 Active Storage makes it simple to upload and reference files in cloud services
 like Amazon S3 and Microsoft Azure Storage, and attach those files to Active
 Records. Supports having one main service and mirrors in other services for
 redundancy. It also provides a disk service for testing or local deployments,
 but the focus is on cloud storage.
 .
 Files can be uploaded from the server to the cloud or directly from the client
 to the cloud.
 .
 Image files can furthermore be transformed using on-demand variants for
 quality, aspect ratio, size, or any other MiniMagick supported transformation.

 Active Support is a collection of utility classes and standard library
 extensions that were found useful for the Rails framework.
 .
 The classes reside in this package so they can be loaded as needed in
 Ruby projects outside of Rails.

 Rails is a full-stack, open-source web framework in Ruby for writing
 real-world applications.
 .
 Being a full-stack framework means that all layers are built to work
 seamlessly together. That way you don't repeat yourself and you can
 use a single language from top to bottom. Everything from templates to
 control flow to business logic is written in Ruby.

 This package contains the Rails internals, i.e. components that implement
 and/or control application bootup, plugins, generators, and rake tasks.