Upload Files

gem
https://github.com/carrierwaveuploader/carrierwave

tutorial
http://richonrails.com/articles/allowing-file-uploads-with-carrierwave

joomla

tutorial:
https://www.digitalocean.com/community/tutorials/how-to-install-joomla-on-a-virtual-server-running-centos-6

LAMP (Linux, Apache, MySQL, PHP)

Tutorial:
https://www.digitalocean.com/community/tutorials/how-to-install-linux-apache-mysql-php-lamp-stack-on-centos-6

problems fixed:

To install mysql via yum
https://blog.marceloaltmann.com/en-installing-latest-version-of-mysql-via-yum-pt-instalar-a-versao-mais-recente-do-mysql-via-yum/

although it is better to install mariadb for rhel

Asociaciones many_tomany

referencias:


asociacioes básicas
http://guides.rubyonrails.org/association_basics.html

consulta con mvc
http://stackoverflow.com/questions/11480939/many-to-many-has-many-through-association-form-with-data-assigned-to-linking-m

para las vistas
http://api.rubyonrails.org/classes/ActionView/Helpers/FormHelper.html#method-i-fields_for

ejemplo avanzado
http://www.createdbypete.com/articles/working-with-nested-forms-and-a-many-to-many-association-in-rails-4/

consulta actual Rails 4
http://stackoverflow.com/questions/19473044/rails-4-many-to-many-association-not-working