How to connect mysql2 to Ruby on Rails? - mysql

Question

I am trying to work on a RoR project, I have created the project called tester to check my db connection, command which I had used is 'rails new tester -d mysql'
my gemfile has mysql2 gem included
I have installed mysql and workbench, and my database.yml looks like this:
default: &default
adapter: mysql2
encoding: utf8
pool: <%=ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
username: root
password: password
host: localhost
socket: MySQL
development: <<: *default
database: tester_development
test: <<:*default
database: tester_test
production: <<: *default
database: tester_production
username: tester
password: <%=ENV['TESTER_DATABASE_PASSWORD'] %>
And my cmd error is following:
C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/mysql2-0.4.9-x64-mingw32/lib/mysql2/mysql2.rb:2:in `require': cannot load such file -- mysql2/2.4/mysql2 (LoadError)
from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/mysql2-0.4.9-x64-mingw32/lib/mysql2/mysql2.rb:2:in `<top (required)>'
from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/mysql2-0.4.9-x64-mingw32/lib/mysql2.rb:31:in `require'
from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/mysql2-0.4.9-x64-mingw32/lib/mysql2.rb:31:in `<top (required)>'
from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/bundler-1.16.0/lib/bundler/runtime.rb:81:in `require'
from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/bundler-1.16.0/lib/bundler/runtime.rb:81:in `block (2 levels) in require'
from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/bundler-1.16.0/lib/bundler/runtime.rb:76:in `each'
from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/bundler-1.16.0/lib/bundler/runtime.rb:76:in `block in require'
from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/bundler-1.16.0/lib/bundler/runtime.rb:65:in `each'
from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/bundler-1.16.0/lib/bundler/runtime.rb:65:in `require'
from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/bundler-1.16.0/lib/bundler.rb:114:in `require'
from C:/Users/donki/Desktop/testing/tester/config/application.rb:7:in `<top (required)>'
from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.1.4/lib/rails/commands/server/server_command.rb:133:in `require'
from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.1.4/lib/rails/commands/server/server_command.rb:133:in `block in perform'
from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.1.4/lib/rails/commands/server/server_command.rb:130:in `tap'
from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.1.4/lib/rails/commands/server/server_command.rb:130:in `perform'
from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/command.rb:27:in `run'
from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/invocation.rb:126:in `invoke_command'
from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor.rb:387:in `dispatch'
from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.1.4/lib/rails/command/base.rb:63:in `perform'
from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.1.4/lib/rails/command.rb:44:in `invoke'
from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.1.4/lib/rails/commands.rb:16:in `<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'
Sorry for the long post. I really do not understand what the error is. The error occurs when I try to run rails server.
Help would be appreciated.

Answer 1

It's seems like you are using windows and ruby 2.4
but I think mysql2 library not support ruby 2.4 in windows till now,
So, It would be better to use ruby 2.3 instead of ruby2.4
Hope it will help you.
reference