Switch to sqlite3 for the database as it is easier to manage. Update the migrations so they work under rails 5.2

Author: Kyle d'Oliveira

polymorphic_integer_type.gemspec

@@ -18,10 +18,10 @@ Gem::Specification.new do |spec|
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
 
-  spec.add_development_dependency "bundler", "~> 1.2"
+  spec.add_dependency "activerecord"
+  spec.add_development_dependency "bundler"
   spec.add_development_dependency "rake"
   spec.add_development_dependency "rspec"
-  spec.add_development_dependency "activerecord", "4.2.0"
-  spec.add_development_dependency "mysql2", "0.3.16"
+  spec.add_development_dependency "sqlite3"
   spec.add_development_dependency "byebug"
 end

spec/spec_helper.rb

@@ -13,6 +13,7 @@
   config.before(:suite) do
     database_config = YAML.load(File.open("#{File.dirname(__FILE__)}/support/database.yml"))
     ActiveRecord::Base.establish_connection(database_config)
+    ActiveRecord::MigrationContext.new("#{File.dirname(__FILE__)}/support/migrations").migrate
   end
 
   config.around do |example|

spec/support/database.yml

@@ -1,5 +1,5 @@
 ---
-:adapter: mysql2
+:adapter: sqlite3
 :host: localhost
 :database: polymorphic_integer_type_test
 :username: root

spec/support/migrations/1_create_link_table.rb

@@ -1,4 +1,4 @@
-class CreateLinkTable < ActiveRecord::Migration
+class CreateLinkTable < ActiveRecord::Migration[5.2]
 
   def up
     create_table :links do |t|

spec/support/migrations/2_create_animal_table.rb

@@ -1,4 +1,4 @@
-class CreateAnimalTable < ActiveRecord::Migration
+class CreateAnimalTable < ActiveRecord::Migration[5.2]
 
   def up
     create_table :animals do |t|

spec/support/migrations/3_create_person_table.rb

@@ -1,4 +1,4 @@
-class CreatePersonTable < ActiveRecord::Migration
+class CreatePersonTable < ActiveRecord::Migration[5.2]
 
   def up
     create_table :people do |t|

spec/support/migrations/4_create_food_table.rb

@@ -1,4 +1,4 @@
-class CreateFoodTable < ActiveRecord::Migration
+class CreateFoodTable < ActiveRecord::Migration[5.2]
 
   def up
     create_table :foods do |t|

spec/support/migrations/5_create_drink_table.rb

@@ -1,4 +1,4 @@
-class CreateDrinkTable < ActiveRecord::Migration
+class CreateDrinkTable < ActiveRecord::Migration[5.2]
 
   def up
     create_table :drinks do |t|