How to fix Rails's warning messages with Ruby 2.7.0

Question

Did anyone resolve this issue with Ruby 2.7.0?

I used rbenv and installed Ruby v2.7.0 and then created a Rails project using Rails v6.0.2

Answer 1

To suppress warnings like:

warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call

For now, simply prefix/pass the RUBYOPT environment variable to your rails commands:

RUBYOPT='-W:no-deprecated -W:no-experimental' rails server
or
RUBYOPT='-W:no-deprecated -W:no-experimental' rails db:migrate

This may not work with earlier versions of ruby.

For backward compatibility with earlier versions of ruby prefix it with RUBYOPT='-W0' instead.

example:

RUBYOPT='-W0' bundle exec rspec

If you don't want to prefix this each time you run a command, then simply add this to the last line of your .zshrc or .bashrc (whatever you're using):

export RUBYOPT='-W:no-deprecated -W:no-experimental'
or
export RUBYOPT='-W0'

Also see last point of the notes here:
https://rubyreferences.github.io/rubychanges/2.7.html#warning-and-