Very often I find myself writing small Ruby scripts to scrape data, process CSV files, or build a tiny Sinatra API. In these situations, generating a massive Rails application with ActionMailer, ActionCable, and Webpack is just overkill.

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You can use ActiveRecord outside of a full Rails application in just a few steps. By adding the activerecord and sqlite3 gems to a Gemfile, calling ActiveRecord::Base.establish_connection, defining a schema with ActiveRecord::Schema.define, and creating a model class that inherits from ActiveRecord::Base, you get the full ORM experience in a plain Ruby script. This is useful for small scripts, scrapers, Sinatra APIs, or background workers where loading the entire Rails framework would be overkill.

How to Use ActiveRecord Without Rails