why #!/usr/bin/env ruby doesn't work in crontab?

Question

I have install ruby by rvm (system-wide), and worked correctly via normal console and my rails program is behaving correctly with both rails runner and ap

Answer 1

If you installed ruby via rvm, ruby probably isn't in /usr/bin. Depending on where rvm is installed:

bash -c "source /usr/local/lib/rvm" && rails runner foo.bar

You probably added a source */rvm to your bashrc that is the correct rvm loading script.