Ruby on Rails — Complete Reference of Methods, Classes & Features Not in Ruby

Ruby on Rails — Complete Reference of Methods, Classes & Features Not in Ruby

March 17, 2026

Rails is much more than a framework on top of Ruby — it adds hundreds of methods, classes, and abstractions that plain Ruby simply doesn’t have. This is a complete reference of everything Rails brings to the table, excluding external gems like ActiveRecord, Devise, or Pundit. All items come from Action Pack, Action View, Action Mailer, Action Cable, Active Support, Active Job, or Action Dispatch.

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Ruby on Rails — Complete Reference of Methods, Classes & Features Not in Ruby March 17, 2026 Rails is much more than a framework on top of Ruby — it adds hundreds of methods, classes, and abstr…

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Rails built-ins only — ActiveRecord, Devise, Pundit, and all other gems are excluded by design.