How to separate Jekyll posts into two different folders?

Question

I have a _posts folder and I just want a simple way to separate the posts in the folder into two different folders, and not have any permalink changes, for purely organizational reasons.

Answer 1

Just create subdirectories in your _posts directory; the subdirectories will be ignored when Jekyll generates permalinks.

Answer 2

I recently did this to my _posts folder because I have over 200 files. I decided to create folders that represent each year I have a posts for. Doing this though, broke post_url. The error is something like as follows when you run jekyll build

Liquid Exception: Could not find post "blah-blah" in tag 'post_url'. Make sure the post exists and the name is correct. in _posts/2007/blah-blah.md

I had to go back in and where ever I used post_url, I had to add /year/ in front of each post url links.

https://github.com/jekyll/jekyll/issues/1714#issuecomment-28167702