You can check if the connection is possible by running the following script:
require './config/environment.rb' # Assuming the script is located in the root of the rails app
begin
ActiveRecord::Base.establish_connection # Establishes connection
ActiveRecord::Base.connection # Calls connection object
puts "CONNECTED!" if ActiveRecord::Base.connected?
puts "NOT CONNECTED!" unless ActiveRecord::Base.connected?
rescue
puts "NOT CONNECTED!"
end
