Add support for postgres

.rbenv-vars-sample

 MAIL_FROM_ADDRESS=
 
 AARDBEI_HOSTNAME=
+
+RAILS_ENV=
+
+DB_NAME=
+DB_USER=
+DB_PASS=

Gemfile

 
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem 'rails', '~> 5.0.0', '>= 5.0.0.1'
-# Use sqlite3 as the database for Active Record
-gem 'sqlite3'
 # Use Puma as the app server
 gem 'puma', '~> 3.0'
 # Use SCSS for stylesheets
 end
 
 group :development do
+  # Use sqlite3 as the database for development
+  gem 'sqlite3'
+
   # Access an IRB console on exception pages or by using <%= console %> anywhere in the code.
   gem 'web-console'
   gem 'listen', '~> 3.0.5'
   gem 'spring-watcher-listen', '~> 2.0.0'
 end
 
+group :production do
+  # Use a real database in production
+  gem 'pg'
+end
+
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
 gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]

Gemfile.lock

     nio4r (2.0.0)
     nokogiri (1.7.1)
       mini_portile2 (~> 2.1.0)
+    pg (0.20.0)
     puma (3.8.2)
     rack (2.0.1)
     rack-test (0.6.3)
   jquery-rails
   listen (~> 3.0.5)
   mailgun_rails
+  pg
   puma (~> 3.0)
   rails (~> 5.0.0, >= 5.0.0.1)
   sass-rails (~> 5.0)

app/controllers/members_controller.rb

 
     respond_to do |format|
       format.html do
-        invited = "invited to Aardbei and " if new_rec else ""
+        invited = ""
+        invited = "invited to Aardbei and " if new_rec
+
         flash_message(
           :success,
           "#{@person.full_name} #{invited}added to group."

config/database.yml

   database: db/test.sqlite3
 
 production:
-  <<: *default
-  database: db/production.sqlite3
+  adapter: postgresql
+  encoding: unicode
+  database: <%= ENV['DB_NAME'] %>
+  username: <%= ENV['DB_USER'] %>
+  password: <%= ENV['DB_PASS'] %>
+  pool: 5