未定义的方法`已验证'为nil：NilClass(undefined method `verified' for nil:NilClass)

编程入门行业动态更新时间:2024-10-27 03:27:52

我试图在视图中将这个方法应用于@ post.author，但我得到了

undefined method 'verified' for nil:NilClass

def showVerifiedIcon(user) u = User.where(username: user).first if u.verified? '' else end end

I'm trying to apply this methond to @post.author in the view, but I get

undefined method 'verified' for nil:NilClass

def showVerifiedIcon(user) u = User.where(username: user).first if u.verified? '' else end end

最满意答案

在用户方法上使用方法的最佳方法是用户尝试不确定它们是否为零。在你的情况下：

def showVerifiedIcon(user) u = User.find_by_username(user) if u.try(:verified?) #will return nil if u is nil '' else end end

The best way to user methods on objects that you are not sure if they will be nil or not is to user try. In your case:

def showVerifiedIcon(user) u = User.find_by_username(user) if u.try(:verified?) #will return nil if u is nil '' else end end

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未定义方法 nil NilClass method

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