编写宝石时设置配置设置 [英] Setting up configuration settings when writing a gem

问题描述

我有一个配置

c $ c> class允许配置gem：

  module NameChecker 
 class配置
 attr_accessor： api_key，：：log_level 
 
 def初始化
 self.api_key = nil 
 self.log_level ='info'
 end 
 end 
 
 class<< self 
 attr_accessor：configuration 
 end 
 $ b def self.configure 
 self.configuration || = Configuration.new 
如果block_given是yield（配置）？ 
 end 
 end 
  

现在可以这样使用：

  NameChecker.configure do | config | 
 config.api_key ='dfskljkf'
 end 
  

但是， t似乎能够访问我的配置变量与其他类在我的宝石。例如，当我在 spec_helper.rb 中配置gem时，像这样：

 ＃spec / spec_helper.rb 
需要name_checker
 
 NameChecker.configure do | config | 
 config.api_key ='dfskljkf'
结束
  

并参考配置我的代码：

 ＃LIB / name_checker / net_checker.rb 
模块NameChecker 
类NetChecker 
p NameChecker.configuration.api_key 
 end 
 end 
  

我得到一个未定义的方法错误：

 `<类：NetChecker> '：未定义的方法`API_KEY' 的零：NilClass（NoMethodError）$ b $ 
 
解决方案
尝试重构： 
 
 
  def self.configuration 
 @configuration || =配置.new 
 end 
 
 def self.configure 
 yield（configuration）if block_given？ 
 end 
  
 
I'm writing a gem which I would like to work with and without the Rails environment.


I have a Configuration class to allow configuration of the gem:
module NameChecker
  class Configuration
    attr_accessor :api_key, :log_level

    def initialize
      self.api_key = nil
      self.log_level = 'info'
    end
  end

  class << self
    attr_accessor :configuration
  end

  def self.configure
    self.configuration ||= Configuration.new
    yield(configuration) if block_given?
  end
end
This can now be used like so:
NameChecker.configure do |config|
  config.api_key = 'dfskljkf'
end
However, I don't seem to be able to access my configuration variables from withing the other classes in my gem. For example, when I configure the gem in my spec_helper.rb like so:
# spec/spec_helper.rb
require "name_checker"

NameChecker.configure do |config|
  config.api_key = 'dfskljkf'
end
and reference the configuration from my code:
# lib/name_checker/net_checker.rb
module NameChecker
  class NetChecker
    p NameChecker.configuration.api_key
  end
end
I get an undefined method error:
`<class:NetChecker>': undefined method `api_key' for nil:NilClass (NoMethodError)
What is wrong with my code?
解决方案
Try refactoring to:
def self.configuration
  @configuration ||=  Configuration.new
end

def self.configure
  yield(configuration) if block_given?
end


                        
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