The code executes different method according to the environment, in Rails. In this way, you can show message only in development environment.
Judge Environment
Rails.env.development?, Rails.env.production? returns true/false.
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if Rails.env.development? // what you want to do end |
What is Rails.env?
Rails.env is not String, it is ActiveSupport::StringInquirer extending String. StringInquirer is used as follows.
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vehicle = ActiveSupport::StringInquirer.new('car') vehicle.car? # => true vehicle.bike? # => false |
Then, how StringInquirer is implemented?
Here is ActiveSupport::StringInquirer in master branch on .
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# frozen_string_literal: true module ActiveSupport class StringInquirer < String private def respond_to_missing?(method_name, include_private = false) (method_name[-1] == "?") || super end def method_missing(method_name, *arguments) if method_name[-1] == "?" self == method_name[0..-2] else super end end end end |
It can use all methods String has.
