Spree is an open source e-commerce solution. IMHO has good architecture for learning. Spree has a clean API, clear models, front end and back end, extensions,

Spree is an open source e-commerce solution. IMHO has good architecture for learning. Spree has a clean API, clear models, front end and back end, extensions, and command line tools. https://github.com/spree/spree https://github.com/spree/spree Especially take a look at the models: https://github.com/spree/spree/tree/master/core/app/models/spree https://github.com/spree/spree/tree/master/core/app/models/s...