Javascript Modularized Promise Chain Out of Order

我想弄清楚爲什麼我的承諾鏈執行失序，儘管寫了一個非嵌套的然後鏈。我的函數已被模塊化，以減少將在我的鏈中發生的代碼膨脹（我期望有五個方法），我不確定這些模塊中的某些內容是否導致順序跳轉，或者是由於我的總體承諾結構。Javascript Modularized Promise Chain Out of Order

這裏是終端輸出：

Executing (a6bf615e-5497-47b2-8aea-3f7d70927cba): START TRANSACTION; 
Executing (a6bf615e-5497-47b2-8aea-3f7d70927cba): SET SESSION TRANSACTION ISOLATION LEVEL REPEATABLE READ; 
Step 1: Document Find 
Step 3: Cancel Stripe Subscription 
string //console.log(typeof subscriptionId); 
sub_jsdfjsdfjdsfjsdfj //console.log(subscriptionId) 
Executing (a6bf615e-5497-47b2-8aea-3f7d70927cba): SELECT .... 
Step 2: Set Array 
[ 13, 14 ] //console.log(documentArr); 
undefined //console.log(canceledStripeAccount); 
undefined //console.log(canceledAt)

這是我的承諾結構：

var sequelize = require('sequelize'); 
var models = require('../../../models/db-index'); 
var deleteAccount = require('./delete-account'); 


//DELETE /settings/account 
exports.delete = function(req, res){ 
    var documents; 
    var documentArr; 
    var canceledStripeAccount; 
    var canceledAt; 

    return models.sequelize.transaction().then(function(t){ 

     return deleteAccount.queryAllDocuments(req.session.organizationId, t) 
     .then(function(_document){ 
       console.log("Step 2: Set Array"); 
       documentArr = _document; 
       console.log(documentArr); 
     }) 
     .then(deleteAccount.cancelStripeAccount(req.session.subscriptionId, canceledStripeAccount, canceledAt)) 
     .then(function(canceledStripeAccount){ 
      console.log(canceledStripeAccount); 
      console.log(canceledAt) 
     }); 
    }); 
};

模塊文件：

var models = require('../../../models/db-index'); 
var components = require('./components'); 
var stripe = require('stripe')(process.env.STRIPE_API_KEY); 

module.exports = { 

    queryAllDocuments: function(organization, t){ 
     console.log("Step 1: Document Find"); 
     return models.Document.findAll({ 
      include: [{ 
       model: models.User, 
       include: [{ 
        model: models.Organization, 
        where: { 
         organizationId: organization 
        } 
       }] 
      }], 
      transaction: t 
     }) 
    }, 

    cancelStripeAccount: function(subscriptionId, canceledStripeAccount, canceledAt){ 
     console.log("Step 3: Cancel Stripe Subscription"); 
     console.log(typeof subscriptionId); 
     console.log(subscriptionId) 
     return stripe.subscriptions.del(subscriptionId).then(function(_canceledStripeAccount){ 
      return canceledStripeAccount = _canceledStripeAccount; 
      //canceledAt = canceledStripeAccount.canceled_at; 
     }) 
    } 

}

來源

2017-07-07 cphill

也許無關，但'components'沒有在'then'處理程序中定義 – MinusFour

感謝您的漁獲物，其實我刪除的功能，清理的問題的代碼。與我面臨的問題無關。 – cphill

您調用的函數，直接之前.then()甚至將其回調（並從經過的返回值來.then()）：

.then(deleteAccount.cancelStripeAccount(req.session.subscriptionId, 
     canceledStripeAccount, canceledAt))

相反，.then()應傳遞一個函數引用，因此它可以晚些時候調用該函數：

.then(() => deleteAccount.cancelStripeAccount(req.session.subscriptionId, 
       canceledStripeAccount, canceledAt))

來源

2017-07-07 00:23:12 MinusFour

謝謝你的回答，我是否正確地說過在調用deleteAccount之前，前一個'then（）'函數沒有地方返回回調對象，這就是爲什麼它會跳轉順序？我也很抱歉，我現在還不熟悉es6，所以es5等價物在'deleteAccount'之前是'function（obj）{}'？ '。然後（函數（）{}，deleteAccount ...）'？ – cphill

Javascript Modularized Promise Chain Out of Order

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