Building an ORM with AReL: Walking up the (AS)Tree.
summary
Builds a working tiny ORM called storm on top of ARel, using the pg gem and a Postgres visitor to generate SQL; implements schema caching, Column->Type mapping (string/integer plus a generic fallback), attribute sets with reader/writer singleton methods, and ARel insert/update/delete managers to perform create, find, update, destroy and count. The result is a complete CRUD engine in ~560 lines of code that runs against PostgreSQL and passes the demo tests.
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chapters (8)
- 0:00Introduction and context
- 2:51Understanding ORMs
- 5:43Core architecture and setup
- 9:42Database connections and schema
- 14:00Setting up tests
- 16:42Attributes and typecasting
- 21:00Readers and writers
- 23:36CRUD operations and conclusion
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