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Hiding Ruby 2.7 Deprecation Warnings in Rails 6

Andrew Mason on February 06, 2020

Hiding Ruby 2.7 Deprecation Warnings in Rails 6 If you have upgraded your Rails app to Ruby 2.7, you are probably seeing a lot of deprec...
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Ruslan Kornev •

Hi Andrew, i've cloned your repository and still got warnings. What I'm doing wrong?

[1] pry(main)> Post.first
/Users/r.kornev/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/activemodel-6.0.2.1/lib/active_model/type/integer.rb:13: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
/Users/r.kornev/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/activemodel-6.0.2.1/lib/active_model/type/value.rb:8: warning: The called method `initialize' is defined here
/Users/r.kornev/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/activerecord-6.0.2.1/lib/active_record/connection_adapters/postgresql/oid/specialized_string.rb:12: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
/Users/r.kornev/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/activemodel-6.0.2.1/lib/active_model/type/value.rb:8: warning: The called method `initialize' is defined here
  Post Load (1.0ms)  SELECT "posts".* FROM "posts" ORDER BY "posts"."id" ASC LIMIT $1  [["LIMIT", 1]]
=> nil
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Daniel Hollands •

The string -W:no-deprecated -W:no-experimental didn't work for me, but -W0 did, which I found at stackoverflow.com/a/59594760/1049688

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Chris Lewis •

You can also choose to have depreciation warnings sent to the log file rather than printed out to the console. For example, in the test environment, add the following to config/environments/test.rb

config.active_support.deprecation = :log
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Michele Gerarduzzi •

On method #1 (using dotenv-rails), the line to add to .env should read:

RUBYOPT='-W:no-deprecated -W:no-experimental'

as the dotenv-rails gem will take care to export it.

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Wayne •

None of these worked for me.

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Andrew Mason •

Did you reload your zshrc/bashrc or reload your terminal?

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Lee Smith 🍻 •

So this is just to silence them within ruby? Won’t rails internals eventually knock out these warnings?

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Andrew Mason •

They will but this will help until that update lands!