Seen this so many times by novice developers, whose work style is often "Trial and error, and as soon as it works, stop and change nothing." And it's so easy to

Seen this so many times by novice developers, whose work style is often "Trial and error, and as soon as it works, stop and change nothing." And it's so easy to slip in there because it works perfectly locally and often even in non-production envs, unless you've seeded them with production-like amounts of data, and with the ORM it looks fine. Like in Rails: Product.where(category_id: xx).filter {|p| p.name.include?("computer") } vs Product.where(category_id: xx).where("name like '%?%'", "computer") PS: I know there's an Arel way of doing the above without putting any SQL into the app -- use your imagination and pretend that's what I did, because I still don't have that memorized :)