A sample application using ActiveAdmin, Devise, Rails 4 and Ruby where the users authenticate using their usernames and do not have an email
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app
bin
config
db
lib
log
public
vendor/assets
.gitignore
.ruby-gemset
.ruby-version
Gemfile
Gemfile.lock
README.md
Rakefile
config.ru

README.md

Sample application

This is the code to a tutorial I wrote demonstrating how to setup an application using ActiveAdmin (AA), Devise, Rails 4 and Ruby 2, where users can authenticate with their usernames only and not have an email at all.