Rails-如何从lib目录中调用方法? [英] Rails - how to call methods from lib directory?

问题描述

我在lib dir(文件my_class_name.rb)中有此方法:

I have this method in the lib dir (file my_class_name.rb):

class MyClassName
  def doSomething
    ...
  end
  ...
end

在控制器中:

class UsersController < ApplicationController
  require 'my_class_name'

  def show_stats
    ::MyClassName.doSomething()
  end
end

返回

MyClassName:Class的未定义方法`doSomething'

undefined method `doSomething' for MyClassName:Class

如何正确调用此方法?

推荐答案

您已经使用实例方法编写了一个类，因此，如果您想用它的编写方式来调用它，则需要编写:

You've written a class with an instance method, so if you want to call it how you've written it you'll need to write:

  mcn = MyClassName.new
  mcn.doSomething

(通过创建一个实例，然后在该实例上调用该方法)

(by creating an instance, and then calling the method on that instance)

如果您想要的是一个类方法，请将其定义为:

If what you want is a class method, define it as:

class MyClassName
  def self.doSomething
    ...
  end
  ...
end

并像这样调用它:MyClassName.doSomething

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