Rails 一直在寻找不存在的宝石

Question

I've replaced the gem mysql2 for a sqlite3 in development environment. However Rails keeps looking for it. I've tried to delete Gemfile.lock and it didn't work. I've also changed the database.yml file.

This is the error when I do rails db:create

LoadError: cannot load such file -- /home/gn09/.rbenv/versions/2.6.1/lib/ruby/gems/2.6.0/gems/arel-9.0.0/lib/arel/visitors/mysql.rb

Answer 1

1. replace gem in Gemfile

#gemfile.rb
gem 'sqlite3'

2. database.yml something like this

3. bundle

4. bundle update - update Gemfile.lock correctly
5. rails db:create db:migrate
6. rails s

Answer 2

First uninstall ruby

rbenv uninstall 2.6.1

Then install again to get a fresh set of gems

rbenv uninstall 2.6.1

Then install bundler

gem install bunder -v '2.1.4'

Then

 bundle install