"require if" in Ruby

Question

Here is what I have in my rack app

#rb file
require 'pry'
class .....

#GemFile
group :development do
    gem "pry"
    gem "pry-nav"
end

Of course, in production it causes an error. How do make a kind of "require if"?

Answer 1

require 'pry' if ENV['RACK_ENV'] == 'development'

Answer 2

May be you can embed it inside a if block

according to docs Sinatra provides a environment variable http://www.sinatrarb.com/intro#Environments

if development?
 require 'pry'
end

wherever you need to use it.

this may not be the exact solution you may be looking for just a wild guess