Add, configure FriendlyId for permalinks

Gemfile

@@ -50,6 +50,8 @@ gem 'rails_autolink', '~> 1.1.6'
 gem 'will_paginate', '~> 3.0'
 gem 'acts_as_list', '~> 0.3.0'
 
+gem 'friendly_id', '~> 5.1.0'
+
 gem 'awesome_nested_set', github: 'finnlabs/awesome_nested_set', branch: 'v2.1.6-rails4'
 
 gem 'color-tools', '~> 1.3.0', require: 'color'

Gemfile.lock

@@ -210,6 +210,8 @@ GEM
       fog-core
       fog-json
     formatador (0.2.5)
+    friendly_id (5.1.0)
+      activerecord (>= 4.0.0)
     gherkin (2.12.2)
       multi_json (~> 1.3)
     globalize (4.0.3)
@@ -489,6 +491,7 @@ DEPENDENCIES
   factory_girl_rails (~> 4.5)
   faker
   fog (~> 1.23.0)
+  friendly_id (~> 5.1.0)
   globalize (~> 4.0.3)
   gon (~> 4.0)
   grape (~> 0.10.1)

config/initializers/friendly_id.rb

@@ -0,0 +1,88 @@
+# FriendlyId Global Configuration
+#
+# Use this to set up shared configuration options for your entire application.
+# Any of the configuration options shown here can also be applied to single
+# models by passing arguments to the `friendly_id` class method or defining
+# methods in your model.
+#
+# To learn more, check out the guide:
+#
+# http://norman.github.io/friendly_id/file.Guide.html
+
+FriendlyId.defaults do |config|
+  # ## Reserved Words
+  #
+  # Some words could conflict with Rails's routes when used as slugs, or are
+  # undesirable to allow as slugs. Edit this list as needed for your app.
+  config.use :reserved
+
+  config.reserved_words = %w(new edit index session login logout users admin
+    stylesheets assets javascripts images)
+
+  #  ## Friendly Finders
+  #
+  # Uncomment this to use friendly finders in all models. By default, if
+  # you wish to find a record by its friendly id, you must do:
+  #
+  #    MyModel.friendly.find('foo')
+  #
+  # If you uncomment this, you can do:
+  #
+  #    MyModel.find('foo')
+  #
+  # This is significantly more convenient but may not be appropriate for
+  # all applications, so you must explicity opt-in to this behavior. You can
+  # always also configure it on a per-model basis if you prefer.
+  #
+  # Something else to consider is that using the :finders addon boosts
+  # performance because it will avoid Rails-internal code that makes runtime
+  # calls to `Module.extend`.
+  #
+  # config.use :finders
+  #
+  # ## Slugs
+  #
+  # Most applications will use the :slugged module everywhere. If you wish
+  # to do so, uncomment the following line.
+  #
+  # config.use :slugged
+  #
+  # By default, FriendlyId's :slugged addon expects the slug column to be named
+  # 'slug', but you can change it if you wish.
+  #
+  # config.slug_column = 'slug'
+  #
+  # When FriendlyId can not generate a unique ID from your base method, it appends
+  # a UUID, separated by a single dash. You can configure the character used as the
+  # separator. If you're upgrading from FriendlyId 4, you may wish to replace this
+  # with two dashes.
+  #
+  # config.sequence_separator = '-'
+  #
+  #  ## Tips and Tricks
+  #
+  #  ### Controlling when slugs are generated
+  #
+  # As of FriendlyId 5.0, new slugs are generated only when the slug field is
+  # nil, but if you're using a column as your base method can change this
+  # behavior by overriding the `should_generate_new_friendly_id` method that
+  # FriendlyId adds to your model. The change below makes FriendlyId 5.0 behave
+  # more like 4.0.
+  #
+  # config.use Module.new {
+  #   def should_generate_new_friendly_id?
+  #     slug.blank? || <your_column_name_here>_changed?
+  #   end
+  # }
+  #
+  # FriendlyId uses Rails's `parameterize` method to generate slugs, but for
+  # languages that don't use the Roman alphabet, that's not usually sufficient.
+  # Here we use the Babosa library to transliterate Russian Cyrillic slugs to
+  # ASCII. If you use this, don't forget to add "babosa" to your Gemfile.
+  #
+  # config.use Module.new {
+  #   def normalize_friendly_id(text)
+  #     text.to_slug.normalize! :transliterations => [:russian, :latin]
+  #   end
+  # }
+end