我不知道红宝石的要求

Question

I'm new to Ruby

MakModule.rb

module Display
  class Multiply
    def Multiply.mul(first, second)
      return first * second
    end
  end
end

MakRequire1.rb

require "Display"
puts Multiply.mul 5,6

MakRequire2.rb

require "MakModule.rb"
puts Multiply.mul 5,6

both file give me the error below

ruby: No such file or directory -- makRequire (LoadError)

How should I correct my code?

Answer 1

It is simply impossible that the code you posted here generates that error message. The error message says that you tried to require a file named makRequire , but that filename doesn't appear anywhere in the code you posted.

Without the actual code that is generating the actual error, it is impossible to answer your question. However, here are a few general tips:

Whenever the computer tells you that it cannot find something, in 99% of the cases, the problem is that the thing the computer tells it couldn't find isn't actually there.

So, in this case, the computer tells you that it cannot find a file named makRequire.rb , and the most likely explanation for that is that makRequire.rb doesn't actually exist. So, the first thing you need to check is: does makRequire.rb (note the capitalization and the file extension) actually exist? Because if it doesn't exist, then the reason why the computer cannot find it, should be rather obvious.

In 99% of the rest of the cases, the problem is that the thing the computer is looking for does exist, but the computer is looking in the wrong place. So, after you have verified that makRequire.rb actually does exist, you need to make sure that the directory the file is in, is in Ruby's $LOAD_PATH , and if it isn't, you need to add that directory to Ruby's $LOAD_PATH . Alternatively, if you want to require the file relative to the path of the file that is doing the requiring, you need to use require_relative instead of require .

The third thing to check for, is whether the user who own the ruby process has sufficient privileges to access the file makRequire.rb , the directory it is in and all of its parent directories.

Answer 2

尝试这个，

require File.join(File.dirname(__FILE__),'MarkModule')

Answer 3

Try require './MakModule' , because the . is the current directory.

Answer 4

require 'MakModule'

Answer 5

You can require a file that is in the same directory. To use a module you would typically include the module inside a class definition. So you would never require Display , you would require the file that contains Display (without the .rb extension, usually).