CODEWITHSUNDEEP
ruby-on-railsruby
KAKAK
KAKAK

Reputation: 899

Rails not honoring specified version when creating app

When i create an app using rails with specified version it is not honoring that, even though the Gemfile write 5.2.1 it upgrades to 5.2.2 in the Gemfile.lock file

This is what i did

gem install rails -v 5.2.1

rails _5.2.1_ new backend-solidus -d postgresql

however during installation log this shows:

Fetching rails 5.2.2
Installing rails 5.2.2

Full logfile: https://pastebin.com/qC6d2wws

Upvotes: 0

Views: 41

Answers (1)

Tom Lord
Tom Lord

Reputation: 28305

This is intentional; it's by design.

Here is the relevant source code, from the current rails master branch:

  def rails_gemfile_entry
    if options.dev?
      [
        GemfileEntry.path("rails", Rails::Generators::RAILS_DEV_PATH)
      ]
    elsif options.edge?
      [
        GemfileEntry.github("rails", "rails/rails")
      ]
    else
      [GemfileEntry.version("rails",
                        rails_version_specifier,
                        "Bundle edge Rails instead: gem 'rails', github: 'rails/rails'")]
    end
  end

  def rails_version_specifier(gem_version = Rails.gem_version)
    if gem_version.segments.size == 3 || gem_version.release.segments.size == 3
      # ~> 1.2.3
      # ~> 1.2.3.pre4
      "~> #{gem_version}"
    else
      # ~> 1.2.3, >= 1.2.3.4
      # ~> 1.2.3, >= 1.2.3.4.pre5
      patch = gem_version.segments[0, 3].join(".")
      ["~> #{patch}", ">= #{gem_version}"]
    end
  end

In particular, note the ~> operator.

The use of this means that, even though your Gemfile will specify version ~> 5.2.1, the actual version that bundler chooses to install is "the latest version that's >= 5.2.1 and < 5.3.0".

Patch releases contain small changes - such as minor bug fixes and security patches. It is extremely rare that your code will break due to a patch version update; it's far more likely that you'll remain vulnerable to a security vulnerability if you fail to update.

Therefore rails, by default, installs the latest patch of the specified version.

If you really want to explicitly revert to rails 5.2.1, you may edit the Gemfile to say:

rails '5.2.1'

then, re-run bundle update.

Upvotes: 4

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