升级到Rails 5.1.4的问题

Question

I attempt to upgrade to Rails 5.1.4. Seems to update without an issue, however, a version check still shows 5.0.4. Any ideas?

Ruby Version:

ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-darwin16]

Terminal Output:

$ rails -v
Rails 5.0.4
$ gem install rails --version=5.1.4
Successfully installed rails-5.1.4
Parsing documentation for rails-5.1.4
Done installing documentation for rails after 0 seconds
1 gem installed
$ rails -v
Rails 5.0.4

Answer 1

Uninstall all versions of rails installed in your system by: gem uninstall rails

It should prompt you with something like below

Select gem to uninstall:
1. rails-4.2.6
2. rails-5.1.4
3. All versions
Choose Option "All Versions" and uninstall all

Install the desired rails version:

gem install rails --version=5.1.4
rails -v
5.1.4

Update : Since you mentioned using bundle install , check if rails is specified with 5.1.4 in your Gemfile or not.

Answer 2

Sometimes, i met this problem, because you have two versions of rails in your railties . You can do this

gem uninstall railties

Select gem to uninstall:
1. railties-5.1.4
2. railties-5.0.4
3. All versions

Type 3 to remove all, then you can reinstall rails 5.1.4 again.

Answer 3

Either use

bin/rails -v

or

bundle exec rails -v

to select the version of rails specified in your Gemfile

Or do what I do and install https://direnv.net/ and add a .envrc file to the project. Then when you cd to that project, the path will be updated appropriately and rails -v will work as expected:

PATH_add "./bin"