How to properly set up a redirect from without / to /?

Question

Yii

Please tell me how to properly set up a redirect from without / to /
I tried this way, the whole site went to hell, css js img stopped connecting.

RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_URI} !(.*)/$
RewriteRule ^(.*[^/])$ $1/ [L,R=301]