Sometimes it is not possible to add the pry-rails gem to a rails project. For this reason a starting the rails console with pry and execute the following ruby code:

gistfile1.txt

# start rails console first:
# bundle exec pry -r ./config/environment

require rails
require 'rails/console/app'
require 'rails/console/helpers'

extend Rails::ConsoleMethods

ActiveRecord::Base.logger = Logger.new(STDOUT)