Fix health check destroying db connections (#5249)

app/controllers/health_checks_controller.rb

@@ -37,10 +37,7 @@ class HealthChecksController < ApplicationController
   private
 
   def check_database
-    ActiveRecord::Base.establish_connection # Establishes connection
-    ActiveRecord::Base.connection # Calls connection object
-
-    raise 'Unable to connect to Database' unless ActiveRecord::Base.connected?
+    raise 'Unable to connect to Database' unless ActiveRecord::Base.connection.active?
     raise 'Unable to connect to Database - pending migrations' unless ActiveRecord::Migration.check_pending!.nil?
   rescue StandardError => e
     raise "Unable to connect to Database - #{e}"

lib/tasks/configuration.rake

@@ -32,9 +32,7 @@ namespace :configuration do
 
     info 'Checking connection to Postgres Database:'
     begin
-      ActiveRecord::Base.establish_connection # Establishes connection
-      ActiveRecord::Base.connection # Calls connection object
-      failed('Unable to connect to Database') unless ActiveRecord::Base.connected?
+      failed('Unable to connect to Database') unless ActiveRecord::Base.connection.active?
     rescue StandardError => e
       failed("Unable to connect to Database - #{e}")
     end