Eliminate MySQL dependency of Rails 5 stub server (#279)

* [rails] In order to set up the Ruby on Rails stub server easily, remove the dependency on MySQL

* [rails] Update sample codes of Ruby on Rails stub server

modules/openapi-generator/src/main/resources/rails5/Gemfile

@@ -3,8 +3,8 @@ source 'https://rubygems.org'
 
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem 'rails', '~> 5.0.0'
-# Use mysql as the database for Active Record
-gem 'mysql2', '>= 0.3.18', '< 0.5'
+# Use sqlite as the database for Active Record
+gem 'sqlite3', '~> 1.3'
 # Use Puma as the app server
 gem 'puma', '~> 3.0'
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder

modules/openapi-generator/src/main/resources/rails5/database.yml

@@ -1,54 +1,22 @@
-# MySQL. Versions 5.0 and up are supported.
-#
-# Install the MySQL driver
-#   gem install mysql2
-#
-# Ensure the MySQL gem is defined in your Gemfile
-#   gem 'mysql2'
-#
-# And be sure to use new-style password hashing:
-#   http://dev.mysql.com/doc/refman/5.7/en/old-client.html
-#
-default: &default
-  adapter: mysql2
-  encoding: utf8
-  pool: 5
-  username: root
-  password:
-  socket: /tmp/mysql.sock
-
+# SQLite version 3.x
+#   gem install sqlite3-ruby (not necessary on OS X Leopard)
 development:
-  <<: *default
-  database: api_demo_development
+  adapter: sqlite3
+  database: db/development.sqlite3
+  pool: 5
+  timeout: 5000
 
 # Warning: The database defined as "test" will be erased and
 # re-generated from your development database when you run "rake".
 # Do not set this db to the same as development or production.
 test:
-  <<: *default
-  database: api_demo_test
+  adapter: sqlite3
+  database: db/test.sqlite3
+  pool: 5
+  timeout: 5000
 
-# As with config/secrets.yml, you never want to store sensitive information,
-# like your database password, in your source code. If your source code is
-# ever seen by anyone, they now have access to your database.
-#
-# Instead, provide the password as a unix environment variable when you boot
-# the app. Read http://guides.rubyonrails.org/configuring.html#configuring-a-database
-# for a full rundown on how to provide these environment variables in a
-# production deployment.
-#
-# On Heroku and other platform providers, you may have a full connection URL
-# available as an environment variable. For example:
-#
-#   DATABASE_URL="mysql2://myuser:mypass@localhost/somedatabase"
-#
-# You can use this database configuration with:
-#
-#   production:
-#     url: <%= ENV['DATABASE_URL'] %>
-#
 production:
-  <<: *default
-  database: api_demo_production
-  username: api_demo
-  password: <%= ENV['API_DEMO_DATABASE_PASSWORD'] %>
+  adapter: sqlite3
+  database: db/production.sqlite3
+  pool: 5
+  timeout: 5000

samples/server/petstore/rails5/.openapi-generator/VERSION

@@ -1 +1 @@
-3.0.0-SNAPSHOT
+3.0.1-SNAPSHOT

samples/server/petstore/rails5/Gemfile

@@ -3,8 +3,8 @@ source 'https://rubygems.org'
 
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem 'rails', '~> 5.0.0'
-# Use mysql as the database for Active Record
-gem 'mysql2', '>= 0.3.18', '< 0.5'
+# Use sqlite as the database for Active Record
+gem 'sqlite3', '~> 1.3'
 # Use Puma as the app server
 gem 'puma', '~> 3.0'
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder

samples/server/petstore/rails5/config/database.yml

@@ -1,54 +1,22 @@
-# MySQL. Versions 5.0 and up are supported.
-#
-# Install the MySQL driver
-#   gem install mysql2
-#
-# Ensure the MySQL gem is defined in your Gemfile
-#   gem 'mysql2'
-#
-# And be sure to use new-style password hashing:
-#   http://dev.mysql.com/doc/refman/5.7/en/old-client.html
-#
-default: &default
-  adapter: mysql2
-  encoding: utf8
-  pool: 5
-  username: root
-  password:
-  socket: /tmp/mysql.sock
-
+# SQLite version 3.x
+#   gem install sqlite3-ruby (not necessary on OS X Leopard)
 development:
-  <<: *default
-  database: api_demo_development
+  adapter: sqlite3
+  database: db/development.sqlite3
+  pool: 5
+  timeout: 5000
 
 # Warning: The database defined as "test" will be erased and
 # re-generated from your development database when you run "rake".
 # Do not set this db to the same as development or production.
 test:
-  <<: *default
-  database: api_demo_test
+  adapter: sqlite3
+  database: db/test.sqlite3
+  pool: 5
+  timeout: 5000
 
-# As with config/secrets.yml, you never want to store sensitive information,
-# like your database password, in your source code. If your source code is
-# ever seen by anyone, they now have access to your database.
-#
-# Instead, provide the password as a unix environment variable when you boot
-# the app. Read http://guides.rubyonrails.org/configuring.html#configuring-a-database
-# for a full rundown on how to provide these environment variables in a
-# production deployment.
-#
-# On Heroku and other platform providers, you may have a full connection URL
-# available as an environment variable. For example:
-#
-#   DATABASE_URL="mysql2://myuser:mypass@localhost/somedatabase"
-#
-# You can use this database configuration with:
-#
-#   production:
-#     url: <%= ENV['DATABASE_URL'] %>
-#
 production:
-  <<: *default
-  database: api_demo_production
-  username: api_demo
-  password: <%= ENV['API_DEMO_DATABASE_PASSWORD'] %>
+  adapter: sqlite3
+  database: db/production.sqlite3
+  pool: 5
+  timeout: 5000