javascript - 克隆并修改 `express-validator`链

Question

如何克隆 express-validator 链并使其可选，而不影响原始链？例如，考虑这个例子:

var checkPassword = body('password').trim().isLength({min: 10});
var checkPasswordOptional = checkPassword.optional();

// Creates an account.
router.post('/accounts', checkPassword, createAccount);

// Updates an account. Only provided fields are updated.
router.put('/accounts/:id', checkPasswordOptional, updateAccount);

但是有了这个，checkPassword 和 checkPasswordOptional 都变成可选的。

Answer 1

尚不支持克隆链。

但是，您可以使用工厂函数来根据需要多次生成相同的验证器链:

const createPasswordCheck = () => body('password').trim().isLength({ min: 10 });

// Uses the default password validation chain    
router.post('/accounts', createPasswordCheck(), createAccount);

// In addition to the default set of password validations,
// updating an account also makes it optional.
router.put('/accounts/:id', createPasswordCheck().optional(), updateAccount);

_{免责声明:这里是express-validator维护者。}