如何计算模型中的nil值？

Assuming I have a model named "Person" & that person is defined by name, age, gender & race.

假设我有一个名为“人”的模型,那个人是根据姓名,年龄,性别和种族来定义的。

How do I iterate through the model to find out which values are nil?

如何遍历模型以找出哪些值为零?

For example:

name: peter

age: 34

gender: nil

race: nil

--Nil count: 2--

- 尼尔数:2--

I understand I would have iterate through each field, do a +1 if value if nil & output the total value.

我知道我会遍历每个字段,如果为n,则输入+1 if值并输出总值。

Thanks for any help or guidance!

感谢您的帮助或指导!

1 个解决方案

#1

If your instance is p then:

如果您的实例是p,那么:

nils = p.attributes.values.select(&:nil?).count

will give you the number of nil attributes.

会给你nil属性的数量。