错误:无法将nil强制转换为Fixnum [英] ERROR: nil can't be coerced into Fixnum

问题描述

首先，这个问题与我之前的问题有点相似，但我觉得有足够的不同来启动新线程.当我尝试在模型上测试验证时，就会出现问题.我有一个用户模型，该模型必须要求字段:default_price.我的测试如下:

First of all, this question is slightly similar to my previous question, but I felt is different enough for me to start a new thread. The problem arises in when I try to test a validation on my model. I have a User model that must require the field :default_price. My test is as follows:

it "should require default packs" do
  User.new(FactoryGirl.build(:user, :default_packs => " ")).should_not be_valid
end

但是，当我运行测试时，出现以下错误:

However, when I run the test, I get the following error:

 Failure/Error: should_not be_valid
 TypeError:
   nil can't be coerced into Fixnum
 # ./app/models/user.rb:62:in `*'
 # ./app/models/user.rb:62:in `daily_saving_potential_cents'
 # ./spec/models/user_spec.rb:155:in `block (2 levels) in <top (required)>'

daily_saving_potential_cents定义如下:

The daily_saving_potential_cents is defined as follows:

  def daily_saving_potential_cents
    return default_price_cents * default_packs
  end

default_price_cents只是default_price的简化版本，而default_packs是我的模型中的另一个字段.问题源于以下事实:当default_price_cents为空白时，这两个值不能相乘，但是如何在测试中解决此问题?由于进行了验证，因此default_price_cents永远不能为空，但这是我是否要对其进行测试.

default_price_cents is just a monteized version of default_price, and default_packs is another field in my model. The problem stems from the fact that these two can't be multiplied together when default_price_cents is blank, but how do I fix this in my tests? Because of my validation, the default_price_cents should never be blank, but it is if I'm testing against it.

推荐答案

我通过使用以下方法简单地确保对新模型定义的验证来解决此问题:

I solved this by simply ensuring the validations on the new model definitions as well, using:

  def daily_saving_potential_cents
    unless default_price_cents.nil? && default_packs.nil?
      return default_price_cents * default_packs
    end
  end

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