rspec - Circular require issue with Ruby -


i trying implement currency based application using ruby, find that:

  require 'dollar'   require 'franc'   puts 'why not work?'   class money     attr_reader :amount     def self.dollar(number)      dollar.new number    end     def ==(other)      self.amount == other.amount    end      def self.franc(number)      franc.new(number)    end  end

i have franc class looks this:

require 'money'  class franc < money    attr_reader :amount    def initialize(amount)     @amount = number   end    def times(mul)     amount = @amount * mul     franc.new(amount)   end    def ==(other)     return false unless other.is_a? self.class     super   end  end

this direct translation of of code kent beck book ruby. when run bin/rspec see:

/home/vamsi/do/wycash/lib/franc.rb:3:in `<top (required)>': uninitialized constant money (nameerror)     /home/vamsi/do/wycash/lib/money.rb:2:in `require'     /home/vamsi/do/wycash/lib/money.rb:2:in `<top (required)>'     /home/vamsi/do/wycash/lib/dollar.rb:1:in `require'     /home/vamsi/do/wycash/lib/dollar.rb:1:in `<top (required)>'     /home/vamsi/do/wycash/spec/dollar_spec.rb:1:in `require'     /home/vamsi/do/wycash/spec/dollar_spec.rb:1:in `<top (required)>'     /home/vamsi/do/wycash/.bundle/ruby/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/configuration.rb:1435:in `load'     /home/vamsi/do/wycash/.bundle/ruby/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/configuration.rb:1435:in `block in load_spec_files'     /home/vamsi/do/wycash/.bundle/ruby/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/configuration.rb:1433:in `each'     /home/vamsi/do/wycash/.bundle/ruby/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/configuration.rb:1433:in `load_spec_files'     /home/vamsi/do/wycash/.bundle/ruby/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/runner.rb:100:in `setup'     /home/vamsi/do/wycash/.bundle/ruby/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/runner.rb:86:in `run'     /home/vamsi/do/wycash/.bundle/ruby/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/runner.rb:71:in `run'     /home/vamsi/do/wycash/.bundle/ruby/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/runner.rb:45:in `invoke'     /home/vamsi/do/wycash/.bundle/ruby/2.3.0/gems/rspec-core-3.5.4/exe/rspec:4:in `<top (required)>'     bin/rspec:17:in `load'     bin/rspec:17:in `<main>'

you should put require 'franc' after defined money in first script.

the class money defined when ruby executes second_script.

edit: circular require isn't issue :

# a.rb puts "a" require_relative 'b'  # b.rb puts "b" require_relative 'a'  # ruby a.rb b

replacing require_relative load './b.rb' result in infinite loop , "stack level deep" error.

still, should define money in money.rb, franc in franc.rb, ... , not put franc in money.


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