grails - 如果没有，则无法正常工作

Question

我写了一个if if条件，该条件利用if not(!)引发错误。但是，条件不符合我的预期，无论当前用户是谁，都会引发错误:

public void findCorrectUserRole() {
    if (Book.name.equals("Test Answers")) {
        User currentUser = User.getCurrentUser()
        if (currentUser) {
            if (!currentUser.hasUserRole("Teacher") || !currentUser.hasUserRole("System Administrator")) {
                throw new LCEX("Sorry, only a teacher or System Administrator can edit this.");
            }
        }
    }else{
        "Do Something Else"
    }
}

Answer 1

您的条件是否错误应该是:

if (!currentUser.hasUserRole("Teacher") && !currentUser.hasUserRole("System Administrator")) {
            throw new LCEX("Sorry, only a teacher or System Administrator can edit this.");
          }

要么

if (!(currentUser.hasUserRole("Teacher") || currentUser.hasUserRole("System Administrator"))) {
            throw new LCEX("Sorry, only a teacher or System Administrator can edit this.");
          }

现在，如果currentUser角色是“teacher”，则他不是“系统管理员”，因此if条件为true。