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FriendlyId is the “Swiss Army bulldozer” of slugging and permalink plugins for ActiveRecord. It allows you to create pretty URL’s and work with human-friendly strings as if they were numeric ids for ActiveRecord models.

Easily and efficiently make your ActiveRecord models support hierarchies

  • closure-tree
  • ruby
  • nested-hashes
  • tree-structure

Ruby finite-state-machine-inspired API for modeling workflow

  • ruby
  • dsl
  • aasm
  • state-machine

Ruby on Rails model and controller UML class diagram generator. (`brew/port/apt-get install graphviz` before use!)

lol_dba is a small package of rake tasks that scan your application models and displays a list of columns that probably should be indexed. Also, it can generate .sql migration scripts.