Rails model.valid？冲洗自定义错误并错误地返回true [英] Rails model.valid? flushing custom errors and falsely returning true
问题描述
我正在尝试向我的User模型的实例添加自定义错误，但是何时调用有效？
I am trying to add a custom error to an instance of my User model, but when I call valid? it is wiping the custom errors and returning true.
[99] pry(main)> u.email = "test@test.com"
"test@test.com"
[100] pry(main)> u.status = 1
1
[101] pry(main)> u.valid?
true
[102] pry(main)> u.errors.add(:status, "must be YES or NO")
[
[0] "must be YES or NO"
]
[103] pry(main)> u.errors
#<ActiveModel::Errors:[...]@messages={:status=>["must be YES or NO"]}>
[104] pry(main)> u.valid?
true
[105] pry(main)> u.errors
#<ActiveModel::Errors:[...]@messages={}>
如果我从内部使用 validate 方法模型，然后就可以使用，但是此特定的验证是通过其他方法（需要传递参数）中添加的：
If I use the validate method from within the model, then it works, but this specific validation is being added from within a different method (which requires params to be passed):
User
def do_something_with(arg1, arg2)
errors.add(:field, "etc") if arg1 != arg2
end
由于上述原因，user.valid吗？
Because of the above, user.valid? is returning true even when that error is added to the instance.
推荐答案
在ActiveModel中，有效吗？的定义如下：
In ActiveModel, valid? is defined as following:
def valid?(context = nil)
current_context, self.validation_context = validation_context, context
errors.clear
run_validations!
ensure
self.validation_context = current_context
end
因此存在错误已清除。您必须将所有自定义验证放入某些 validate 回调中。像这样：
So existing errors are cleared is expected. You have to put all your custom validations into some validate callbacks. Like this:
validate :check_status
def check_status
errors.add(:status, "must be YES or NO") unless ['YES', 'NO'].include?(status)
end
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