[Programming beginner] What to do when rails s becomes an error in the local development environment

Status

When I tried to launch the rails server as usual in the terminal,

terminal


[email protected] app name% rails s
Traceback (most recent call last):
	5: from bin/rails:3:in `<main>'
	4: from bin/rails:3:in `load'
	3: from /Users/user/app name bin/spring:10:in `<top (required)>'
	2: from /Users/user/app name/bin/spring:10:in `new'
	1: from /System/Library/Frameworks/Ruby.framework/Versions/
2.6/usr/lib/ruby/2.6.0/bundler/lockfile_parser.rb:95:in `initialize'
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby
/2.6.0/bundler/
lockfile_parser.rb:108:in `warn_for_outdated_bundler_version'
: You must use Bundler 2 or greater with this lockfile. (Bundler::LockfileError)

I got the above error and the server suddenly stopped booting.

environment

terminal



■ruby -v
ruby 2.5.3p105 (2018-10-18 revision 65156) [x86_64-darwin19]

■bundler -v
Bundler version 1.7.4

What went

Because bundler is already installed

terminal


sudo gem update bundler

When you do

terminal


Your Ruby version is 2.6.3, but your Gemfile specified 2.5.3

Will come out. The ruby version of the app I'm developing is 2.5.3 For some reason, the ruby version of Mac's local development environment has become 2.6.3. (Maybe I upgraded without being aware of it) The above was displayed because the version is different.

I have already created a production environment for deploying on AWS, and the version of ruby in the production environment is Since it was 2.5.3, I want to unify the version with 2.5.3,

terminal


rbenv local 2.5.3
(Considering the possibility of developing other apps locally using rails in the future
Only this project is daringly local, not rbenv global 2.5.I specified to use 3)

terminal


source ~/.bash_profile

The server is now up!

from now on

Why the local ruby version has gone up I would like to investigate. .. ..

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