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Applied Filters: Pro Episodes xActive Record x
STI and Polymorphic Associations
Episode #394Nov 25, 201221 comments

STI and Polymorphic Associations

Single Table Inheritance (STI) can help organize branching logic into separate classes, but a polymorphic association may be a better fit if there are unique database columns. (14 minutes)
A Tour of State Machines
Episode #392Nov 17, 201225 comments

A Tour of State Machines

Here I show how three popular state machine gems can be used to clean up a list of boolean/datetime fields. I also show a custom solution which keeps track of the history of events. (12 minutes)
Multitenancy with PostgreSQL
Episode #389Oct 27, 201244 comments

Multitenancy with PostgreSQL

PostgreSQL Schemas can help create a multi-tenant app by keeping data separate at the database layer. Integrating with migrations can be tricky though, so watch this episode for the full details. (11 minutes)
Multitenancy with Scopes
Episode #388Oct 20, 201246 comments

Multitenancy with Scopes

A multi-tenant application can be difficult to implement because the data for each tenant must be completely separate. Here I show how to do this using subdomains and default scopes in Active Record. (12 minutes)
Hacking with Arel
Episode #355May 30, 201213 comments

Hacking with Arel

Here I show a variety of ways to rewrite a long SQL query using only Active Record and Arel. This includes generating scopes dynamically, adding an "or" operator, and adding a powerful "match" method. (15 minutes)
Full-Text Search in PostgreSQL
Episode #343Apr 17, 201291 comments

Full-Text Search in PostgreSQL

Postgres offers full-text searching right out of the box. This episode shows how to write queries from scratch, apply tools like Texticle and pg_search, and optimize performance through indexes. (16 minutes)