Why not give it a systemprompt that specifies some you're requirements: "you are a experienced senior ruby developer who writes robust maintainable code, follow these coding guidelines 《examples》"
If I thought it was worthwhile, maybe that would patch that specific hole.
The other problem I get when trying to make it write code is that it gets kinda slippery with iterated refinements. In the back and forth dialog, addressing issues 1 through n in sequence, it gets to a place where issue k < n is fixed but issue i < k gets broken again. Trying to get it to produce the right code becomes a programming exercise of its own, and it's more frustrating than actually typing stuff up myself.
I mean, I still use it to get a basic shape especially when I'm working with a command line tool I'm not an expert in, it's still useful. It's just not great code.
