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  * Kontroler udostępnia widokowi tylko zmienne obiektu (//instance variable//, poprzedzony symbolem ''@'').
  * Jeśli chcemy udostępnić coś wszystkim kontrolerom, umieszczamy to w ''ApplicationController'' (''app/controllers/application_controller.rb'').
  * ''t.timestamps'', is a special command that creates two magic columns called ''created_at'' and ''updated_at''.
  * ''User.create!'' (read “create bang”) works just like the ''create'' method except that it raises an ActiveRecord::Record-Invalid exception if the creation fails.
  * Jeśli zmieniamy domyślny język aplikacji, trzeba pamiętać o polach date_select: http://i18n.lighthouseapp.com/projects/14947/tickets/12
  * [[inf:ruby:rake|Rake]]
  * [[inf:ruby:rails_3|Rails 3 Way]]
  * [[inf:rails:console|Rails Console]]
  * [[inf:rails:generators|Rails Standard Generators]]
  * [[inf:ruby:rails:minitest|MiniTest]]
  * [[inf:ruby:rails:log|Czyszczenie loga]]
  * [[inf:ruby:rails:active_record_magic|ActiveRecord Magic]]

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