用：if验证 [英] Validates with :if

问题描述

我正在尝试创建一个条件，其中属性一为零，属性二为一，那么模型无效。但是当我输入：

I'm trying to create a condition in which the attribute 'one' is zero and the attribute 'two' is one, then a model is not valid. But when I make:

Model.create(:one => 1, :two => 0).valid?

单元测试返回 true ！为什么？

The unit test returns true! Why?

validates :one, :two, :presence => true, :if => :if condition_testing?

def condition_testing?
    !(one == 0 && two == 1)
end

推荐答案

我认为您的语法有误：

validates :one, :two, :presence => true, :if => :condition_testing?

def condition_testing?
    !(one == 0 && two == 1)
end

有一个：如果其中太多...
如果我正确理解，您只想在 one == 0&&两个== 1 ？
然后您进行condition_testing吗？被倒置（省略！（））

There was one :if too many in there... And if I understand correctly you want to have it only validate in case one == 0 && two == 1? Then you condition_testing? is inverted (leave out the !())

如果不确定，您可以尝试使用 pry 并将断点插入您的 condition_testing？方法中以查看发生了什么。

If unsure you could try to use pry and insert a breakpoint into your condition_testing? method to see what's going on.

（请注意在条件测试之前添加：）

(Please note added ":" before condition testing)

这篇关于用：if验证的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！