How to fix Rails's warning messages with Ruby 2.7.0 - ruby-on-rails

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 v6.0.2.1.
Currently, by running one of
rails s
rails s -u puma
rails s -u webrick
the server is up and the site is served but in the Console log I see two warning messages:
local:~/rcode/rb27$ rails s
=> Booting Puma
=> Rails 6.0.2.1 application starting in development
=> Run `rails server --help` for more startup options
.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/actionpack-6.0.2.1/lib/action_dispatch/middleware/stack.rb:37: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/actionpack-6.0.2.1/lib/action_dispatch/middleware/static.rb:110: warning: The called method `initialize' is defined here
Puma starting in single mode...
* Version 4.3.1 (ruby 2.7.0-p0), codename: Mysterious Traveller
* Min threads: 5, max threads: 5
* Environment: development
* Listening on tcp://127.0.0.1:3000
* Listening on tcp://[::1]:3000
So, the warning messages are:
**.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/actionpack-6.0.2.1/lib/action_dispatch/middleware/stack.rb:37: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call**
**.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/actionpack-6.0.2.1/lib/action_dispatch/middleware/static.rb:110: warning: The called method `initialize' is defined here**
I saw this link and there are some suggestion to switch of warnings like "If you want to disable the deprecation warnings, please use a command-line argument -W:no-deprecated or add Warning[:deprecated] = false to your code." but I was thinking on little bit better solution/fix for actionpack v6.0.2.1

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-

Answer 2

Update to Rails 6.0.3, they fixed the warnings.
If you still get warnings, it's other libraries (see if there are fixed versions or submit a patch) or your own code (how to fix it).

Answer 3

Obviously it will take some time to for ruby team to remove all this warning in next ruby version. For now the command in your terminal
`RUBYOPT='-W:no-deprecated' rails s`
on my basic, plain new rails 6.0.2.1 && ruby 2.7.0 project remove these two warnings lines above in a question.
Also, with command
RUBYOPT='-W:no-experimental' rails s
you will hide warnings about experimental features.
You can combine these two in one command like:
RUBYOPT='-W:no-deprecated -W:no-experimental' rails s
However, I tried these commands inside my old project built with rails 5.2 and ruby 2.6.4 later upgraded to rails 6.0.1 and they didn't worked well on for all warnings messages I got from different rails Active* modules and ruby gems.
Probably we will need some time for upgrading code and gems for new latest stuff.