subdocument

问题 I'm having a little trouble returning and displaying tags that I'm adding to a subdocument. I have no problem adding tags, but want to put a label on the item for each tag. I simply can't find a resource that helps me return the items in an array within a subdocument. I think it's all the helper where I'm stuck - basically the syntactically correct way to write "Items.(this._id).itemTags.find();" :) Oh - and I've cut out a lot of the HTML and JS, but, yes, everything else is working fine. The

问题 I'm having a little trouble returning and displaying tags that I'm adding to a subdocument. I have no problem adding tags, but want to put a label on the item for each tag. I simply can't find a resource that helps me return the items in an array within a subdocument. I think it's all the helper where I'm stuck - basically the syntactically correct way to write "Items.(this._id).itemTags.find();" :) Oh - and I've cut out a lot of the HTML and JS, but, yes, everything else is working fine. The

问题 I Have a document structured like this in mongo DB, and I want to filter to show only active subdocuments: active cars and active fruits. { "name":"Andre", "fruits":[ { "active":true, "fruitname":"apple" },{ "active":false, "fruitname":"banana" } ], "cars":[ { "active":false, "carname":"ford" },{ "active":true, "carname":"GM" }, ] } this is my desired result. { "name":"Andre", "fruits":[ { "active":true, "fruitname":"apple" } ], "cars":[ { "active":true, "carname":"GM" }, ] } I've tried

问题 Here's my data, consisting of a books collection, with a books.reviews sub-collection. books = [{ _id: ObjectId("5558f40ad498c653748cf045"), title: "Widget XYZ", isbn: 1234567890, reviews: [ { _id: ObjectId("5558f40ad498c653748cf046"), userId: "01234", rating: 5, review: "Yay, this great!" }, { _id: ObjectId("5558f40ad498c653748cf047"), userId: "56789", rating: 3, review: "Meh, this okay." } ] }] In Node.js (using Mongoose), I need for users to be able to submit reviews via a form, sending

问题 how do I find and return the first subdocument in the 'tasks' array that matches completed: true? using findOne returns the entire document.. is there another function for returning a subdocument? { title: 'awebsite.com' company: 'a company' companyID: Random.id() category: 'website' starred: false timeline: { tasks: [ { name: 'task1' completed: true todos: [ {todo: 'something', completed: false, todoID: Random.id()} {todo: 'something', completed: false, todoID: Random.id()} {todo: 'something

问题 If you have subdocument arrays, Mongoose automatically creates ids for each one. Example: { _id: "mainId" subDocArray: [ { _id: "unwantedId", field: "value" }, { _id: "unwantedId", field: "value" } ] } Is there a way to tell Mongoose to not create ids for objects within an array? 回答1: It's simple, you can define this in the subschema : var mongoose = require("mongoose"); var subSchema = mongoose.Schema({ //your subschema content },{ _id : false }); var schema = mongoose.Schema({ // schema

问题 Would it be possible for an ObjectId in ModelA to reference a sub-document in modelB ? var C = new Schema({...}); var B = new Schema({c: [C]}); var A = new Schema({c: { type: ObjectId, ref: 'ModelB.ModelC' }); var Model_A = mongoose.model('ModelA', A); var Model_B = mongoose.model('ModelB', B); var Model_C = mongoose.model('ModelC', C); 回答1: Yes it is possible, but you have a few options. Option 1: C as a Subdocument If you really want to use subdocuments, you don't need to create a separate

问题 I am working with a MongoDB database whose collections model classes , students , subjects , and [academic] performance . Below are the Mongoose based schema and models: var mongoose = require('mongoose'); var Schema = mongoose.Schema; var ObjectId = Schema.Types.ObjectId; // SUBJECT collection var subjectSchema = new Schema({ name : { type: String, required: true }, category : { type: String, required: true } }); var Subject = mongoose.model('Subject', subjectSchema); // STUDENT collection

问题 Say you have nested collections a , b , and c , which follow the following map: {"collection":"a", "children":[{"collection":"b", "name":"bee", "children"[{"collection":"c","name":"cee"}]}]} And here is a1 , fetched from a MongoDb database with $http : {"title":"title a1", "id":"a1", "bee":[{"id":"b1"},{"id":"b2"}], "other_array":[{"foo":"bar"},{"foo":"baz"}]} Right now, in the bee array, we have only references ( id ). What we want is to keep following the map to update a1 , and replace

问题 I would prevent any sub document from being removed, thus I added an error to the pre('remove') middleware of each sub document Schema. When calling the .remove() function, it effectively calls the middleware. But when it is deleted without calling remove(), the middleware doesn't check if it has been removed. The cases where is matters is when I receive an object from a remote source, I'd like to perform all the integrity checks via mongoose middlewares to keep everything at the same place.