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up vote 35 down vote favorite
6

I've tried to find some solution for this, but I really couldn't find anything related with the errors that is appearing to me when I run the rails command: rails generate model Book title:string summary:text isbn:string:

/home/vmu/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/activesupport-5.0.1/lib/active_support/xml_mini.rb:51: warning: constant ::Fixnum is deprecated
/home/vmu/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/activesupport-5.0.1/lib/active_support/xml_mini.rb:52: warning: constant ::Bignum is deprecated
/home/vmu/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/activesupport-5.0.1/lib/active_support/core_ext/numeric/conversions.rb:138: warning: constant ::Fixnum is deprecated
Running via Spring preloader in process 3579
Expected string default value for '--jbuilder'; got true (boolean)
      invoke  active_record
   identical    db/migrate/20170104114702_create_books.rb
   identical    app/models/book.rb
      invoke    test_unit
   identical      test/models/book_test.rb
   identical      test/fixtures/books.yml

Anyone know what may be causing these errors?

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Thanks a bunch! I'll ignore those warnings until the next version of Ruby comes out. – user7374147 Jan 4 at 13:01
1  
It's not a bug, it's a feature ;) – cobaltsoda Jan 7 at 3:52
up vote 31 down vote accepted

This warnings appear because you are using ruby 2.4.0.

This version introduced this change: Unify Fixnum and Bignum into Integer

See here for the announcement: https://www.ruby-lang.org/en/news/2016/12/25/ruby-2-4-0-released/

The warnings come from the activesupport gem which is part of rails and will be fixed in an upcoming release.

For now you can just ignore those warnings.

Update: Rails 5.0.2 has been released, which gets rid of the warnings.

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1  
I use ruby 2.3.3p222 (2016-11-21 revision 56859) [x86_64-darwin16] but also get this issue. – aircraft Jan 26 at 14:39
    
How do I ignore the warnings? Running "rails s" fails – Sauron Feb 25 at 22:10
    
@Sauron It should not fail because of warnings. Maybe you have some error additionally? – IngoAlbers Feb 26 at 5:20
    
Are there anything new regarding this? It's annoying to get those warnings thrown in my face all the time. Grrr! – Zeth Mar 1 at 22:40
    
@Zeth In fact, yes. Rails 5.0.2 has been released, which gets rid of the warnings. weblog.rubyonrails.org/2017/3/1/Rails-5-0-2-has-been-release‌​d – IngoAlbers Mar 2 at 7:49
up vote 8 down vote

I assume you're using Rails 5? Check out this link (towards the bottom). Looks like these warnings will go away with release #27458.

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up vote 3 down vote

If these deprecation warnings in active support are the only warnings you are seeing, you can surpress them by passing a RUBYOPT bash variable with the -W0 option which will silence.

so instead of rails server try: RUBYOPT="-W0" rails server or RUBYOPT="-W0" bin/rails server

In rails 5.0 you may want to get in the habit of using bin/rails not just rails, since that's the global rails version which may or may not be the same as your local rails version.

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up vote 2 down vote

I fixed mine by updating rails 

bundle update rails
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Thanks, i can fix it too – Esgi Dendyanri Mar 8 at 9:15

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