Ruby on Rails RoR, Models Active
Record: Basic, Migrations, Validations, Callbacks, Associations,
Query Interface, Active Model Basics
including convention over configuration (CoC), don't repeat yourself (DRY), and the active record pattern.
Source: Wikipedia: Ruby on Rails.
Ruby on Rails is used
in building web applications, social networking sites, cloud storage
Mind map based on
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representations of knowledge, concepts or ideas.