克隆和修改 `express-validator` 链

Question

如何在不影响原始链的情况下克隆 express-validator 链并使其成为可选链？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 都成为可选的。

Answer 1

目前尚不支持克隆链。

但是，您可以使用工厂函数来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。}

克隆和修改 `express-validator` 链

Clone and modify `express-validator` chains

javascript

express-validator