当生成新模型时，不推荐使用 Fixnum

我试图找到一些解决方案，但是我实在找不到任何与我在运行 Rail 命令时出现的错误相关的东西:

Rails 生成模型 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

有人知道是什么导致了这些错误吗？

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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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最佳答案

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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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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I fixed mine by updating rails 

bundle update rails
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I fixed this updating therubyracer gem from version '0.12.2' to '0.12.3'


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