A Deep Embedding of Queries into Ruby

We demonstrate SWITCH, a deep embedding of relational queries into Ruby and Ruby on Rails. With SWITCH, there is no syntactic or stylistic difference between Ruby programs that operate over in-memory array objects or database-resident tables, even if these programs rely on array order or nesting. SWITCH\´s built-in compiler and SQL code generator guarantee to emit few queries, addressing long-standing performance problems that trace back to Rails\´ Active Record database binding. "Looks likes Ruby, but performs like handcrafted SQL, " is the ideal that drives the research and development effort behind SWITCH.