https://www.driftingruby.com/ http://railscasts.com/ https://gorails.com/ https://www.codemy.net/posts https://devchat.tv/rails-clips https://www.rubytapas.com/
https://github.com/rails/rails/blob/master/activerecord/lib/active_record/relation/query_methods.rb#L105-L149
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https://bitbucket.org/b0mb/deploy