如何推广大脑树方法? [英] How to promisify a braintree method?

问题描述

我在推广大脑树方法时遇到了麻烦.具体而言，gateway.transaction.sale. https://developers.braintreepayments.com/reference/request/transaction/sale/node

I'm having trouble promisifying a braintree method. Specifically, gateway.transaction.sale. https://developers.braintreepayments.com/reference/request/transaction/sale/node

我正在将bluebird库与node.js配合使用.

I am using node.js with the bluebird library for promisification.

    ...
    var sale = bluebird.promisify(gateway.transaction.sale);
    return sale({
        amount: '10.00',
        paymentMethodNonce: nonce,
    });
})
.then( // doesn't reach here)
.catch(// logs out error)

具体地说，promise链底部的.catch块注销:

Specifically, the .catch block at the bottom of the promise chain logs out:

[TypeError: this.create is not a function]

当不尝试承诺时，代码可以正常工作.

When not attempting to promisify, the code works fine.

gateway.transaction.sale({
    amount: '10.00',
    paymentMethodNonce: nonce,
}, function(err, result) {
    ... no errors, everything works fine
}

脑树库的实现方式是否有问题?我说错了吗?我可以尝试其他替代策略来避免回调地狱吗?

Is this a problem with how the braintree library is implemented? Am I promisifying wrong? Are there any alternative promisification strategies I can try so I can avoid callback hell?

推荐答案

您缺少上下文参数，也称为this.如果您使用的是bluebird v2，请执行以下操作:

You're missing the context parameter, aka this. If you're using bluebird v2, do this:

var sale = bluebird.promisify(gateway.transaction.sale, gateway.transaction);

如果使用版本3，请执行以下操作:

If you use version 3, do this:

var sale = bluebird.promisify(gateway.transaction.sale, {context: gateway.transaction});

您可以在 Bluebird的文档中看到它.

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