Question

一个小问题我对Ruby很新，我有一个包含其他类的实例的类（组合）

我正在尝试访问Cucumber中的类实例，但不断返回错误 未定义的方法`bk'代表nil：NilClass（NoMethodError） 'bk'方法位于内部类内我猜这个错误是因为Cucumber无法访问内部类。什么是设计这个或合适的解决方案的最佳方式？

class CarConfig


def initialize(browser, wait)
@browser = browser
@wait = wait
@equipments = Equipment.new(@browser)
@interior = Interior.new(@browser)
@engines = Engines.new(@browser)
@exterior = Exterior.new(@browser)
@grades = Grades.new(@browser)
end

def click_comfort
@browser.find_element(:css, 'a.xdata-id-Comfort').click
end


def check_equipment
  equipment_availability = []
  equipment_not_available = " equipment not available"
  equipment_currently_available = "equipment available"

 equipment = [@equipments.lifestyle,@equipments.elegance, @equipments.comfort,   @equipments.executive, @equipments.luxury,
             @equipments.innova].each do

end
  equipment_availability.push equipment

 if "#{equipment_availability}".include? "disabled"
   equipment_not_available
 else
   equipment_currently_available
 end

端

 Cucumber 

 Given /^I have selected Comfort$/ do
 @car_configurator = CarConfig.new(@browser, @wait)
 @browser.get $car_config_page
 sleep(2)
 @car_configurator.click_comfort
 sleep(3)

 end

 Then /^I should see interior BK as available$/ do
 @interior.bk.should_not include ("disabled"), ("selected")
 end

Answer 1

问题简化

没有Cucumber可以简化问题（即问题是一般的ruby编码问题）：

class Interior
    def bk()
        return 'bk method'
    end
end 

class CarConfig
    def initialize(browser, wait)
        @browser = browser
        @wait = wait
        @interior = Interior.new
    end
end

@car_configurator = CarConfig.new('browser', 'wait')
@interior.bk
#=> stuff.rb:16:in `<main>': undefined method `bk' for nil:NilClass (NoMethodError)

问题是@interior不存在于主要范围内（或者在黄瓜步骤中）。它仅在CarConfig的实例中定义 - 即@car_configurator。

<强>解决方案

如果要访问@interior，则需要在CarConfig中为此创建方法。使用attribute accessor很容易完成。 CarConfig类将添加以下行：

attr_accessor :interior

这样班级就变成了：

class CarConfig
    attr_accessor :interior

    def initialize(browser, wait)
        @browser = browser
        @wait = wait
        @interior = Interior.new
    end
end

然后要调用bk对象的@interior方法，您需要从@car_configurator开始访问它：

@car_configurator.interior.bk
#=> "bk method"

红宝石/黄瓜成分设计

1 个答案: