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- http://data-creative.info/process-documentation/2015/08/17/databases-on-heroku/
- http://data-creative.info/process-documentation/2015/06/18/how-to-make-rails-app/
- https://github.com/data-creative/express-on-rails-starter-app/
- http://data-creative.info/process-documentation/2015/07/25/how-to-deploy-a-rails-app-to-heroku/
- https://blog.heroku.com/using-bundler-groups-on-heroku
- https://devcenter.heroku.com/articles/getting-started-with-rails5
- https://blog.heroku.com/container_ready_rails_5
- https://libertyseeds.ca/2016/07/22/Bootstrapping-a-Rails-5-application-with-Rspec-and-Capybara/
- https://github.com/plataformatec/devise
- https://github.com/lynndylanhurley/devise_token_auth
- http://matthughes.io/securing-a-rails-api-with-devise/
- https://github.com/plataformatec/devise/wiki/How-To:-Test-with-Capybara
- http://eileencodes.com/posts/actioncontroller-parameters-now-returns-an-object-instead-of-a-hash/
- http://api.rubyonrails.org/classes/ActionController/StrongParameters.html
- https://devcenter.heroku.com/articles/cleardb#using-ssl-with-cleardb-and-rails
- https://kb.heroku.com/why-am-i-seeing-a-max_questions-error-using-mysql
- http://stackoverflow.com/a/41407638/670433
- http://www.rubydoc.info/github/thoughtbot/shoulda-matchers/Shoulda/Matchers/ActiveModel#validate_inclusion_of-instance_method
- https://github.com/thoughtbot/shoulda-matchers/blob/master/lib/shoulda/matchers/active_model/validate_inclusion_of_matcher.rb
- http://stackoverflow.com/questions/2410639/best-way-to-create-random-datetime-in-rails
- https://github.com/thoughtbot/factory_girl/blob/master/GETTING_STARTED.md
- https://blog.pivotal.io/labs/labs/how-i-test-rake-tasks
- https://www.relishapp.com/rspec/rspec-mocks/v/2-14/docs/message-expectations/expect-a-message-on-any-instance-of-a-class!
- https://gis.stackexchange.com/questions/8650/measuring-accuracy-of-latitude-and-longitude
- https://en.wikipedia.org/wiki/Decimal_degrees
- http://apidock.com/rails/ActiveRecord/Associations/ClassMethods/belongs_to
- http://stackoverflow.com/questions/24642005/rails-association-with-multiple-foreign-keys
- http://stackoverflow.com/questions/6686920/activerecord-query-union
- https://twitter.com/s2t2/status/816031995209850880
- https://gist.github.com/s2t2/0d2929e0ecaba85823e1314935e7941e