bundle uses wrong ruby version - ruby-on-rails

Question

I'm trying to run
env RAILS_ENV=test bundle exec rake db:migrate
and get the following error
Your Ruby version is 2.1.7, but your Gemfile specified 2.2.3
ruby -v
gives me
ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-darwin15]
I'm using rbenv, if that matters. rbenv versions gives the following:
system
* 2.2.3 (set by /Users/thatsme/Projects/demoproject/.ruby-version)
So I have no ruby 2.1.7 installed. Spring is not running and I've run rbenv rehash. Then bundler gem is installed.
I'm going nuts on this. Can somebody please tell me why the wrong ruby version is being used? Thanks!

Answer 1

Running the command below helped me somehow:
rbenv exec gem install bundler

Answer 2

Assumption: You are using RVM.
This means there's a ruby version installed outside of RVM.
Clear your rvm rubies by running
rvm uninstall <ruby version>
once you have uninstalled all rvm rubies do ruby -v, if this returns an output specifying a ruby version then thats the root of the problem. Uninstall it with
sudo apt-get remove ruby
Now install your rvm rubies with rvm install <ruby version> and set it as default rvm use <ruby version>
Now install bundler
gem install bundler
And do bundle install

Answer 3

TLDR;
Check really carefully the content of your .bash_profile or .bashrc file.
None of the answers actually solve my problem. So here's my solution.
This is the error that I got:
$ bundle install
Your Ruby version is 3.0.1, but your Gemfile specified 2.7.1
I checked my rbenv setup:
$ rbenv versions
system
2.4.1
2.5.0
2.7.0
* 2.7.1 (set by /Users/setoelka/awesome-project/.ruby-version)
3.0.1
I uninstall the wrong version to probably reveal a new error. I can just install it again later, I was thinking.
$ rbenv uninstall 3.0.1
It does reveal a new error:
$ bundle install
-bash: /Users/setoelka/.gem/ruby/3.0.0/bin/bundle: /Users/setoelka/.rbenv/versions/3.0.1/bin/ruby: bad interpreter: No such file or directory
Ok, that's strange. I can just remove the .gem directory there.
$ rm -rf ~/.gem/
Now another new error:
$ bundle install
-bash: /Users/setoelka/.gem/ruby/3.0.0/bin/bundle: No such file or directory
It seems like my PATH variable is messed up. So I do:
$ gem environment
RubyGems Environment:
- RUBYGEMS VERSION: 3.2.27
- RUBY VERSION: 2.7.1 (2020-03-31 patchlevel 83) [x86_64-darwin20]
- INSTALLATION DIRECTORY: /Users/setoelka/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0
- USER INSTALLATION DIRECTORY: /Users/setoelka/.local/share/gem/ruby/2.7.0
- RUBY EXECUTABLE: /Users/setoelka/.rbenv/versions/2.7.1/bin/ruby
- GIT EXECUTABLE: /usr/bin/git
- EXECUTABLE DIRECTORY: /Users/setoelka/.rbenv/versions/2.7.1/bin
- SPEC CACHE DIRECTORY: /Users/setoelka/.local/share/gem/specs
- SYSTEM CONFIGURATION DIRECTORY: /Users/setoelka/.rbenv/versions/2.7.1/etc
- RUBYGEMS PLATFORMS:
- ruby
- x86_64-darwin-20
- GEM PATHS:
- /Users/setoelka/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0
- /Users/setoelka/.local/share/gem/ruby/2.7.0
- GEM CONFIGURATION:
- :update_sources => true
- :verbose => true
- :backtrace => false
- :bulk_threshold => 1000
- REMOTE SOURCES:
- https://rubygems.org/
- SHELL PATH:
- /Users/setoelka/.rbenv/versions/2.7.1/bin
- /usr/local/Cellar/rbenv/1.1.2/libexec
- /Users/setoelka/opt/anaconda3/bin
- /Users/setoelka/opt/anaconda3/condabin
- /Users/setoelka/.cargo/bin
- /Users/setoelka/.gem/ruby/3.0.0/bin
- /Users/setoelka/.nvm/versions/node/v16.5.0/bin
- /Users/setoelka/.rbenv/shims
- /Users/setoelka/.rbenv/shims
- /usr/local/bin
- /usr/bin
- /bin
- /usr/sbin
- /sbin
- /Library/Apple/usr/bin
So, it's clear I missed something when checking out my .bash_profile file. That's the problem there:
- /Users/setoelka/.gem/ruby/3.0.0/bin
That line was somehow buried under a plethora of settings inside my .bash_profile.

Answer 4

I had the same problem
I needed to run
bundle
to reinstall all my gems. then
bundle exec rails c