Cannot connect rails and mysql2 - ruby-on-rails

Question

So I'm trying to perform a simple database dump from the command prompt for the first time and the rails command keeps aborting with an error. This is running Ruby 2.3.0 with rails 5.0.7 and mysql 0.5.0.
C:\Users\MR_ra\Documents\Sites\matt_radin_cms>rails db:schema:dump --trace
** Invoke db:schema:dump (first_time)
** Invoke environment (first_time)
** Execute environment
** Invoke db:load_config (first_time)
** Execute db:load_config
** Execute db:schema:dump
rails aborted!
NameError: uninitialized constant Mysql2::Client::REMEMBER_OPTIONS
C:/Ruby23/lib/ruby/gems/2.3.0/gems/mysql2-0.5.0-x86-mingw32/lib/mysql2/client.rb:14:in `default_query_options'
C:/Ruby23/lib/ruby/gems/2.3.0/gems/mysql2-0.5.0-x86-mingw32/lib/mysql2/client.rb:25:in `initialize'
C:/Ruby23/lib/ruby/gems/2.3.0/gems/activerecord-5.0.7/lib/active_record/connection_adapters/mysql2_adapter.rb:25:in `new'
C:/Ruby23/lib/ruby/gems/2.3.0/gems/activerecord-5.0.7/lib/active_record/connection_adapters/mysql2_adapter.rb:25:in `mysql2_connection'
C:/Ruby23/lib/ruby/gems/2.3.0/gems/activerecord-5.0.7/lib/active_record/connection_adapters/abstract/connection_pool.rb:729:in `new_connection'
C:/Ruby23/lib/ruby/gems/2.3.0/gems/activerecord-5.0.7/lib/active_record/connection_adapters/abstract/connection_pool.rb:773:in `checkout_new_connection'
C:/Ruby23/lib/ruby/gems/2.3.0/gems/activerecord-5.0.7/lib/active_record/connection_adapters/abstract/connection_pool.rb:752:in `try_to_checkout_new_connection'
C:/Ruby23/lib/ruby/gems/2.3.0/gems/activerecord-5.0.7/lib/active_record/connection_adapters/abstract/connection_pool.rb:713:in `acquire_connection'
C:/Ruby23/lib/ruby/gems/2.3.0/gems/activerecord-5.0.7/lib/active_record/connection_adapters/abstract/connection_pool.rb:490:in `checkout'
C:/Ruby23/lib/ruby/gems/2.3.0/gems/activerecord-5.0.7/lib/active_record/connection_adapters/abstract/connection_pool.rb:364:in `connection'
C:/Ruby23/lib/ruby/gems/2.3.0/gems/activerecord-5.0.7/lib/active_record/connection_adapters/abstract/connection_pool.rb:883:in `retrieve_connection'
C:/Ruby23/lib/ruby/gems/2.3.0/gems/activerecord-5.0.7/lib/active_record/connection_handling.rb:128:in `retrieve_connection'
C:/Ruby23/lib/ruby/gems/2.3.0/gems/activerecord-5.0.7/lib/active_record/connection_handling.rb:91:in `connection'
C:/Ruby23/lib/ruby/gems/2.3.0/gems/activerecord-5.0.7/lib/active_record/railties/databases.rake:241:in `block (4 levels) in <top (required)>'
C:/Ruby23/lib/ruby/gems/2.3.0/gems/activerecord-5.0.7/lib/active_record/railties/databases.rake:240:in `open'
C:/Ruby23/lib/ruby/gems/2.3.0/gems/activerecord-5.0.7/lib/active_record/railties/databases.rake:240:in `block (3 levels) in <top (required)>'
C:/Ruby23/lib/ruby/gems/2.3.0/gems/rake-12.3.1/lib/rake/task.rb:271:in `block in execute'
C:/Ruby23/lib/ruby/gems/2.3.0/gems/rake-12.3.1/lib/rake/task.rb:271:in `each'
C:/Ruby23/lib/ruby/gems/2.3.0/gems/rake-12.3.1/lib/rake/task.rb:271:in `execute'
C:/Ruby23/lib/ruby/gems/2.3.0/gems/rake-12.3.1/lib/rake/task.rb:213:in `block in invoke_with_call_chain'
C:/Ruby23/lib/ruby/2.3.0/monitor.rb:214:in `mon_synchronize'
C:/Ruby23/lib/ruby/gems/2.3.0/gems/rake-12.3.1/lib/rake/task.rb:193:in `invoke_with_call_chain'
C:/Ruby23/lib/ruby/gems/2.3.0/gems/rake-12.3.1/lib/rake/task.rb:182:in `invoke'
C:/Ruby23/lib/ruby/gems/2.3.0/gems/rake-12.3.1/lib/rake/application.rb:160:in `invoke_task'
C:/Ruby23/lib/ruby/gems/2.3.0/gems/rake-12.3.1/lib/rake/application.rb:116:in `block (2 levels) in top_level'
C:/Ruby23/lib/ruby/gems/2.3.0/gems/rake-12.3.1/lib/rake/application.rb:116:in `each'
C:/Ruby23/lib/ruby/gems/2.3.0/gems/rake-12.3.1/lib/rake/application.rb:116:in `block in top_level'
C:/Ruby23/lib/ruby/gems/2.3.0/gems/rake-12.3.1/lib/rake/application.rb:125:in `run_with_threads'
C:/Ruby23/lib/ruby/gems/2.3.0/gems/rake-12.3.1/lib/rake/application.rb:110:in `top_level'
C:/Ruby23/lib/ruby/gems/2.3.0/gems/railties-5.0.7/lib/rails/commands/rake_proxy.rb:14:in `block in run_rake_task'
C:/Ruby23/lib/ruby/gems/2.3.0/gems/rake-12.3.1/lib/rake/application.rb:186:in `standard_exception_handling'
C:/Ruby23/lib/ruby/gems/2.3.0/gems/railties-5.0.7/lib/rails/commands/rake_proxy.rb:11:in `run_rake_task'
C:/Ruby23/lib/ruby/gems/2.3.0/gems/railties-5.0.7/lib/rails/commands/commands_tasks.rb:51:in `run_command!'
C:/Ruby23/lib/ruby/gems/2.3.0/gems/railties-5.0.7/lib/rails/commands.rb:18:in `<top (required)>'
bin/rails:4:in `require'
bin/rails:4:in `<main>'
Tasks: TOP => db:schema:dump

Answer 1

It's looking like no Mysql installed in your machine or adapter setting is wrong.
First install mysql server in your machine.
after that install mysql2 gem by below command or adding in application gemfile
gem install mysql2
gem 'mysql2'
then do below setting for your adapter
default: &default
adapter: mysql2
username: xxxxx
password: xxxxx
host: localhost
pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
timeout: 5000
Hope this will help you out.

Answer 2

I think the problem with mysql2 gem version, you can define the version like this
gem 'mysql2', '~> 0.3.17'
then bundle install, it solved the problem on my hand.
The database.yml
default: &default
adapter: mysql2
host: localhost
encoding: unicode
username: root
password: #=> if you use password to your local databse then use otherwise empty this
pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
development:
<<: *default
database: database_development