如何在 Keystone.js 项目中使用 Express.js 中间件？

Question

我目前正在构建一个Keystone.js 项目，并且需要使用一些Express.js 中间件库。由于 Keystone.js 是在 Express.js 之上构建的，这似乎相当容易，但到目前为止，我遇到了很多问题。

这是我目前正在尝试的（这是我对正确方法的最佳猜测）：

在我的keystone.js 文件（应用程序的主入口点）中，我在keystone.start() 之前直接插入以下代码：

keystone.app.use(stormpath.init(keystone.app, {
  ...
}));

这里的重要一点是keystone.app.use(...); 位——我查看了 Keystone.js 源代码，似乎底层的 Express.js 应用程序对象公开为keystone.app，这就是为什么我要尝试以这种方式使用它。

不幸的是，虽然我的 Keystone Web 服务器在运行 $ node keystone.js 时启动，但尝试加载我网站上的任何页面都会导致以下异常：

$ node keystone.js

------------------------------------------------
KeystoneJS Started:
keystone is ready on port 3000
------------------------------------------------

TypeError: Object #<Object> has no method 'regenerate'
    at doSignin (/Users/rdegges/Dropbox/Code/testing/keystone/node_modules/keystone/lib/session.js:38:15)
    at Promise.<anonymous> (/Users/rdegges/Dropbox/Code/testing/keystone/node_modules/keystone/lib/session.js:72:5)
    at Promise.<anonymous> (/Users/rdegges/Dropbox/Code/testing/keystone/node_modules/keystone/node_modules/mongoose/node_modules/mpromise/lib/promise.js:177:8)
    at Promise.EventEmitter.emit (events.js:95:17)
    at Promise.emit (/Users/rdegges/Dropbox/Code/testing/keystone/node_modules/keystone/node_modules/mongoose/node_modules/mpromise/lib/promise.js:84:38)
    at Promise.fulfill (/Users/rdegges/Dropbox/Code/testing/keystone/node_modules/keystone/node_modules/mongoose/node_modules/mpromise/lib/promise.js:97:20)
    at Promise.resolve (/Users/rdegges/Dropbox/Code/testing/keystone/node_modules/keystone/node_modules/mongoose/lib/promise.js:114:23)
    at Promise.<anonymous> (/Users/rdegges/Dropbox/Code/testing/keystone/node_modules/keystone/node_modules/mongoose/node_modules/mpromise/lib/promise.js:177:8)
    at Promise.EventEmitter.emit (events.js:95:17)
    at Promise.emit (/Users/rdegges/Dropbox/Code/testing/keystone/node_modules/keystone/node_modules/mongoose/node_modules/mpromise/lib/promise.js:84:38)
    at Promise.fulfill (/Users/rdegges/Dropbox/Code/testing/keystone/node_modules/keystone/node_modules/mongoose/node_modules/mpromise/lib/promise.js:97:20)
    at /Users/rdegges/Dropbox/Code/testing/keystone/node_modules/keystone/node_modules/mongoose/lib/query.js:1400:13
    at model.Document.init (/Users/rdegges/Dropbox/Code/testing/keystone/node_modules/keystone/node_modules/mongoose/lib/document.js:250:11)
    at completeOne (/Users/rdegges/Dropbox/Code/testing/keystone/node_modules/keystone/node_modules/mongoose/lib/query.js:1398:10)
    at Object.cb (/Users/rdegges/Dropbox/Code/testing/keystone/node_modules/keystone/node_modules/mongoose/lib/query.js:1155:11)
    at Object._onImmediate (/Users/rdegges/Dropbox/Code/testing/keystone/node_modules/keystone/node_modules/mongoose/node_modules/mquery/lib/utils.js:137:16)

我已经让 MongoDB 在本地运行得很好，如果我注释掉上面的代码，一切都会按预期工作，所以我知道这是根本原因。

任何帮助将不胜感激。

Answer 1

在使用 keystone 上的“app”对象初始化 keystone 之前，您可以将已经存在的 express 实例传递到 keystone。你可以在这里阅读：

http://keystonejs.com/docs/configuration/#options-concepts

来自 cmets 的 EDIT* 以获取更新的文档：

https://keystonejs.com/documentation/configuration/project-options

甚至还有一点额外的文字描述了如何传入你自己的 express 实例，以及它如何随着新版本的 express 而变化。

var express = require('express'),
app = express(),
keystone = require('keystone'),
serve = require('serve-static'),
favicon = require('serve-favicon'),
body = require('body-parser'),
cookieParser = require('cookie-parser'),
multer = require('multer');

var cookieSecret = 'secretCookie'

//Add your middleware
app.use(cookieParser(cookieSecret));
app.use(body.urlencoded({ extended: true }));
app.use(body.json());
app.use(multer());
keystone.init({
  'name': 'Website Name',
  'brand': 'Website Brand',
  'session': false,
  'updates': 'updates',
  'auth': true,
  'user model': 'User',
  'auto update': true,
  'cookie secret': cookieSecret
});

// Let keystone know where your models are defined. Here we have it at the `/models`
keystone.import('models');

// Serve your static assets
app.use(serve('./public'));

// This is where your normal routes and files are handled
app.get('/', function(req, res, next) {
  res.send('hello world');
});
keystone.app = app;
keystone.start();

然后 keystone 将使用您的 express 实例，这将允许您在初始化 keystone 之前添加所有中间件，就好像它自己是 express 一样。