Check gem version number

My setup: Rails 3.0.9, Ruby 1.9.2

I want to check the gem version for my app through the Rails console. In my gemfile, I have

gem 'rack', '1.2.3'

Ran bundle install after.开发者_如何转开发 In the Rails console,

>> Rack.version
=> "1.1"

Any idea why?

UPDATE

Gemfile.lock

GEM
  remote: http://rubygems.org/
  specs:
    actionpack (3.0.9)
      ...
      rack (~> 1.2.1)
      ...

    rack (1.2.3)

    rack-mount (0.6.14)
      rack (>= 1.0.0)

    warden (1.0.4)
      rack (>= 1.0)

DEPENDENCIES
...  
rack (= 1.2.3)
...

There are several rack versions listed in gemfile.lock.

---

Rack.version

will return the protocol version,

Rack.release

is probably what you are you looking for.

https://github.com/rack/rack/blob/master/lib/rack.rb#L14

Otherwise:

Gem.loaded_specs["rack"]

Example:

Gem.loaded_specs["rack"]
# => #<Gem::Specification name=rack version=1.3.2> 
Gem.loaded_specs["rack"].version
# => #<Gem::Version "1.3.2"> 
Gem.loaded_specs["rack"].version.to_s
# => "1.3.2"

---

Every gem has ::VERSION constant.. so just use Rack::VERSION or OpenSSL::VERSION in console which should give you the version of gem loaded in that console.

---

we can use bundle list or bundle show to list all Gems included by the bundle.

---

Maybe you have multiple version of rack installed, try running gem uninstall rack and see if it offers you two options to choose from, Rack 1.1 and Rack 1.2.3. If so, choose to uninstall Rack 1.1.

If this still does not work, just uninstall Rack and try running bundle update.

I had this problem when I was using multiple rake versions 0.8.7 and 0.9.2, this helped me.