添加到新创建的对象数组

我使用平均堆栈作为我的应用程序的后端。添加到新创建的对象数组

要创建一个新对象，我使用POST。一旦创建了该对象，它就会创建两个链接在一起的其他对象。

ex。我创建了一个Book对象，在该过程中创建了一个章节和页面对象。页面对象添加到Chapter.pages，并添加到Book.chapters。嗯，至少这就是我想要做的，但我收到此错误..

错误：

Unhandled rejection TypeError: Cannot read property 'push' of undefined 
at /Users//Documents/development/mean/lookback/server/api/book/book.controller.js:96:7 
    From previous event: 
at create (/Users//Documents/development/mean/lookback/server/api/book/book.controller.js:88:6) 
at Layer.handle [as handle_request] (/Users//Documents/development/mean/lookback/node_modules/express/lib/router/layer.js:95:5) 
at next (/Users//Documents/development/mean/lookback/node_modules/express/lib/router/route.js:131:13) 
at next (/Users//Documents/development/mean/lookback/node_modules/composable-middleware/lib/composable-middleware.js:40:9) 
at /Users//Documents/development/mean/lookback/server/auth/auth.service.js:38:11 
    From previous event: 
at Middleware_Common_Object.<anonymous> (/Users//Documents/development/mean/lookback/server/auth/auth.service.js:33:10) 
at next (/Users//Documents/development/mean/lookback/node_modules/composable-middleware/lib/composable-middleware.js:59:18) 
at /Users//Documents/development/mean/lookback/node_modules/express-jwt/lib/index.js:123:7 
at /Users//Documents/development/mean/lookback/node_modules/async/lib/async.js:52:16 
at Immediate.<anonymous> (/Users//Documents/development/mean/lookback/node_modules/async/lib/async.js:1206:34) 
at runCallback (timers.js:637:20) 
at tryOnImmediate (timers.js:610:5) 
at processImmediate [as _immediateCallback] (timers.js:582:5)

对象书：

'use strict'; 

    import mongoose from 'mongoose'; 

    var BookSchema = new mongoose.Schema({ 

    chapters:[{ 
     type: mongoose.Schema.Types.ObjectId, 
     ref: 'chapter' 
    }], 


    export default mongoose.model('Book', BookSchema);

章：

'use strict'; 

    import mongoose from 'mongoose'; 

    var ChapterSchema = new mongoose.Schema({ 
     pages: [{ 
     type: mongoose.Schema.Types.ObjectId, 
     ref: 'Page' 
     }], 
     startDate: { 
     type: Date, 
     default: Date.now 
     }, 
     endDate: { 
     type: Date, 
     }, 
     book:{ 
     type: mongoose.Schema.Types.ObjectId, 
     ref: 'Book' 
     } 
    }); 

    export default mongoose.model('Chapter', ChapterSchema);

页码：

'use strict'; 

    import mongoose from 'mongoose'; 

    var PageSchema = new mongoose.Schema({ 
    posts: [{ 
     type: mongoose.Schema.Types.ObjectId, 
     ref: 'Post', 
    }], 
    startDate: { 
     type: Date, 
     default: Date.now 
     }, 
     endDate: { 
     type: Date 
     }, 
     chapter: { 
     type: mongoose.Schema.Types.ObjectId, 
     ref: 'Chapter' 
     } 
    }); 

    export default mongoose.model('Page', PageSchema);

控制器：

export function create(req, res) { 
return Book.create(req.body) 
    .then(book => { 
     var birthdate = new Date(req.body.birthdate); 
     var startDate = new Date(new Date().getFullYear() + 1, birthdate.getMonth(), birthdate.getDate(), 0, 0, 0); 
     var endDate = new Date(new Date().getFullYear() + 1, birthdate.getMonth(), birthdate.getDate() - 1, 23, 59, 59); 
     var chapter = Chapter.create({"book": book._id, "startDate": startDate, "endDate": endDate, pages: []}); 
     var date = new Date(); 
     endDate = new Date(date.getFullYear(), date.getMonth() + 1, 0, 23, 59, 59); 
     var page = Page.create({"chapter": chapter._id, "endDate": endDate}); 
     chapter.pages.push(page._id); 

     book.chapters.push(chapter._id); 
     book.save() 
    .then(respondWithResult(res, 201)) 
    .catch(handleError(res)); 
    }); 
}

我试图推到他们面前来初始化数组，但给我一个错误也..即。 book.chapters = []; chapter.pages = [];

错误：

Unhandled rejection CastError: Cast to ObjectId failed for value "Promise { 
    _bitField: 0, 
    _fulfillmentHandler0: undefined, 
    _rejectionHandler0: undefined, 
    _promise0: undefined, 
    _receiver0: undefined, 
    _trace: 
    { Error 
     at Promise.longStackTracesCaptureStackTrace [as _captureStackTrace] (/Users//Documents/development/mean/lookback/node_modules/bluebird/js/release/debuggability.js:397:19) 
     at Promise._resolveFromExecutor (/Users//Documents/development/mean/lookback/node_modules/bluebird/js/release/promise.js:478:10) 
     at new Promise (/Users//Documents/development/mean/lookback/node_modules/bluebird/js/release/promise.js:77:14) 
     at Function.create (/Users//Documents/development/mean/lookback/node_modules/mongoose/lib/model.js:1803:17) 
     at /Users//Documents/development/mean/lookback/server/api/book/book.controller.js:92:29 
     at tryCatcher (/Users//Documents/development/mean/lookback/node_modules/bluebird/js/release/util.js:16:23) 
     at Promise._settlePromiseFromHandler (/Users//Documents/development/mean/lookback/node_modules/bluebird/js/release/promise.js:510:31) 
     at Promise._settlePromise (/Users//Documents/development/mean/lookback/node_modules/bluebird/js/release/promise.js:567:18) 
     at Promise._settlePromise0 (/Users//Documents/development/mean/lookback/node_modules/bluebird/js/release/promise.js:612:10) 
     at Promise._settlePromises (/Users//Documents/development/mean/lookback/node_modules/bluebird/js/release/promise.js:691:18) 
     at Async._drainQueue (/Users//Documents/development/mean/lookback/node_modules/bluebird/js/release/async.js:133:16) 
     at Async._drainQueues (/Users//Documents/development/mean/lookback/node_modules/bluebird/js/release/async.js:143:10) 
     at Immediate.Async.drainQueues (/Users//Documents/development/mean/lookback/node_modules/bluebird/js/release/async.js:17:14) 
     at runCallback (timers.js:637:20) 
     at tryOnImmediate (timers.js:610:5) 
     at processImmediate [as _immediateCallback] (timers.js:582:5) 
    _parent: 
     { Error 
      at Promise.longStackTracesCaptureStackTrace [as _captureStackTrace] (/Users//Documents/development/mean/lookback/node_modules/bluebird/js/release/debuggability.js:397:19) 
      at Promise._then (/Users//Documents/development/mean/lookback/node_modules/bluebird/js/release/promise.js:231:17) 
      at Promise.then (/Users//Documents/development/mean/lookback/node_modules/bluebird/js/release/promise.js:124:17) 
      at create (/Users//Documents/development/mean/lookback/server/api/book/book.controller.js:88:6) 
      at Layer.handle [as handle_request] (/Users//Documents/development/mean/lookback/node_modules/express/lib/router/layer.js:95:5) 
      at next (/Users//Documents/development/mean/lookback/node_modules/express/lib/router/route.js:131:13) 
      at next (/Users//Documents/development/mean/lookback/node_modules/composable-middleware/lib/composable-middleware.js:40:9) 
      at /Users//Documents/development/mean/lookback/server/auth/auth.service.js:38:11 
      at tryCatcher (/Users//Documents/development/mean/lookback/node_modules/bluebird/js/release/util.js:16:23) 
      at Promise._settlePromiseFromHandler (/Users//Documents/development/mean/lookback/node_modules/bluebird/js/release/promise.js:510:31) 
      at Promise._settlePromise (/Users//Documents/development/mean/lookback/node_modules/bluebird/js/release/promise.js:567:18) 
      at Promise._settlePromise0 (/Users//Documents/development/mean/lookback/node_modules/bluebird/js/release/promise.js:612:10) 
      at Promise._settlePromises (/Users//Documents/development/mean/lookback/node_modules/bluebird/js/release/promise.js:691:18) 
      at Async._drainQueue (/Users//Documents/development/mean/lookback/node_modules/bluebird/js/release/async.js:133:16) 
      at Async._drainQueues (/Users//Documents/development/mean/lookback/node_modules/bluebird/js/release/async.js:143:10) 
      at Immediate.Async.drainQueues (/Users//Documents/development/mean/lookback/node_modules/bluebird/js/release/async.js:17:14) 
      at runCallback (timers.js:637:20) 
      at tryOnImmediate (timers.js:610:5) 
      at processImmediate [as _immediateCallback] (timers.js:582:5) 
     _parent: [Object], 
     _promisesCreated: 0, 
     _length: 2, 
     _promiseCreated: [Circular] }, 
    _promisesCreated: 0, 
    _length: 3, 
    _promiseCreated: null }, 
    pages: 
    [ Promise { 
     _bitField: 0, 
     _fulfillmentHandler0: undefined, 
     _rejectionHandler0: undefined, 
     _promise0: undefined, 
     _receiver0: undefined, 
     _trace: [Object] } ] }" at path "chapters" 
     at Function.create (/Users//Documents/development/mean/lookback/node_modules/mongoose/lib/model.js:1803:17) 
     at /Users//Documents/development/mean/lookback/server/api/book/book.controller.js:92:29 
     at runCallback (timers.js:637:20) 
     at tryOnImmediate (timers.js:610:5) 
     at processImmediate [as _immediateCallback] (timers.js:582:5) 
      at create (/Users//Documents/development/mean/lookback/server/api/book/book.controller.js:88:6) 
      at Layer.handle [as handle_request] (/Users//Documents/development/mean/lookback/node_modules/express/lib/router/layer.js:95:5) 
      at next (/Users//Documents/development/mean/lookback/node_modules/express/lib/router/route.js:131:13) 
      at next (/Users//Documents/development/mean/lookback/node_modules/composable-middleware/lib/composable-middleware.js:40:9) 
      at /Users//Documents/development/mean/lookback/server/auth/auth.service.js:38:11 
      at runCallback (timers.js:637:20) 
      at tryOnImmediate (timers.js:610:5) 
      at processImmediate [as _immediateCallback] (timers.js:582:5) 
    at MongooseError.CastError (/Users//Documents/development/mean/lookback/node_modules/mongoose/lib/error/cast.js:26:11) 
    at ObjectId.cast (/Users//Documents/development/mean/lookback/node_modules/mongoose/lib/schema/objectid.js:147:13) 
    at Array._cast (/Users//Documents/development/mean/lookback/node_modules/mongoose/lib/types/array.js:125:32) 
    at Array._mapCast (/Users//Documents/development/mean/lookback/node_modules/mongoose/lib/types/array.js:296:17) 
    at Object.map (native) 
    at Array.push (/Users//Documents/development/mean/lookback/node_modules/mongoose/lib/types/array.js:309:25) 
    at /Users//Documents/development/mean/lookback/server/api/book/book.controller.js:99:21 
From previous event: 
    at create (/Users//Documents/development/mean/lookback/server/api/book/book.controller.js:88:6) 
    at Layer.handle [as handle_request] (/Users//Documents/development/mean/lookback/node_modules/express/lib/router/layer.js:95:5) 
    at next (/Users//Documents/development/mean/lookback/node_modules/express/lib/router/route.js:131:13) 
    at next (/Users//Documents/development/mean/lookback/node_modules/composable-middleware/lib/composable-middleware.js:40:9) 
    at /Users//Documents/development/mean/lookback/server/auth/auth.service.js:38:11 
From previous event: 
    at Middleware_Common_Object.<anonymous> (/Users//Documents/development/mean/lookback/server/auth/auth.service.js:33:10) 
    at next (/Users//Documents/development/mean/lookback/node_modules/composable-middleware/lib/composable-middleware.js:59:18) 
    at /Users//Documents/development/mean/lookback/node_modules/express-jwt/lib/index.js:123:7 
    at /Users//Documents/development/mean/lookback/node_modules/async/lib/async.js:52:16 
    at Immediate.<anonymous> (/Users//Documents/development/mean/lookback/node_modules/async/lib/async.js:1206:34) 
    at runCallback (timers.js:637:20) 
    at tryOnImmediate (timers.js:610:5) 
    at processImmediate [as _immediateCallback] (timers.js:582:5)

来源

2017-03-06 cohs

你几乎有它。你需要做的是推送实际的对象ID而不是对象本身。

chapter.pages.push（page）;到chapter.pages.push（mongoose.Types.ObjectId（page._id））;

book.chapters.push（chapter）; to book.chapters.push（mongoose.Types.ObjectId（chapter._id））;

export function create(req, res) { 
    return Book.create(req.body) 
    .then(book => { 
     var birthdate = new Date(req.body.birthdate); 
     var startDate = new Date(new Date().getFullYear() + 1, birthdate.getMonth(), birthdate.getDate(), 0, 0, 0); 
     var endDate = new Date(new Date().getFullYear() + 1, birthdate.getMonth(), birthdate.getDate() - 1, 23, 59, 59); 
     var chapter = Chapter.create({"book": book, "startDate": startDate, "endDate": endDate, pages: []}); 
     var date = new Date(); 
     endDate = new Date(date.getFullYear(), date.getMonth() + 1, 0, 23, 59, 59); 
     var page = Page.create({"chapter": chapter, "endDate": endDate}); 
     chapter.pages.push(mongoose.Types.ObjectId(page._id)); 
     book.chapters.push(mongoose.Types.ObjectId(chapter._id)); 
     book.save() 
    .then(respondWithResult(res, 201)) 
    .catch(handleError(res)); 
    }); 
}

来源

2017-03-06 23:44:28

谢谢你的回答。我已更新我的代码以重新显示您所建议的更改。不过，我仍然收到同样的错误。 – cohs

啊请将_id封装在mongoose.Types.ObjectId（chapter._id）中以将id转换为对象。 –

添加到新创建的对象数组

回答

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