mime-types-data provides a registry for information about MIME media type
definitions. It can be used with the Ruby mime-types library or other software
to determine defined filename extensions for MIME types, or to use filename
extensions to look up the likely MIME type definitions.
==== To Install:
Adds support for creating state machines for attributes on any Ruby class
Adds support for creating state machines for attributes on ActiveRecord
Shoulda Matchers provides RSpec- and Minitest-compatible one-liners to test common Rails functionality that, if written by hand, would be much longer, more complex, and error-prone.
Adds support for creating state machines for attributes on ActiveModel
A framework for building reusable, testable & encapsulated view components in Ruby on Rails.
Psych is a YAML parser and emitter. Psych leverages libyaml[https://pyyaml.org/wiki/LibYAML]
for its YAML parsing and emitting capabilities. In addition to wrapping libyaml,
Psych also knows how to serialize and de-serialize most Ruby objects to and from the YAML format.