add pg

Author: su-u

hello_app/Gemfile

@@ -39,6 +39,7 @@ group :development, :test do
   # Adds support for Capybara system testing and selenium driver
   gem 'capybara', '~> 2.13'
   gem 'selenium-webdriver'
+  gem 'sqlite3'
 end
 
 group :development do
@@ -50,5 +51,9 @@ group :development do
   gem 'spring-watcher-listen', '~> 2.0.0'
 end
 
+group :production do
+  gem 'pg', '0.20.0'
+end
+
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
 gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]

hello_app/Gemfile.lock

@@ -86,6 +86,7 @@ GEM
     nio4r (2.5.2)
     nokogiri (1.10.7)
       mini_portile2 (~> 2.4.0)
+    pg (0.20.0)
     public_suffix (4.0.1)
     puma (3.12.2)
     rack (2.0.7)
@@ -176,6 +177,7 @@ DEPENDENCIES
   coffee-rails (~> 4.2)
   jbuilder (~> 2.5)
   listen (>= 3.0.5, < 3.2)
+  pg (= 0.20.0)
   puma (~> 3.7)
   rails (~> 5.1.6)
   sass-rails (~> 5.0)