mongoose

问题 Who knows a better solution to group Orders by date and sum total and count by source. Of course I can group by Source and then I get only totals for this source only, I can alter the result thereafter to get the desired result. But I would like to know if it is possible in one simple $group statement. Eg. ordersByApp = 1, ordersByWEB = 2 Orders collection { _id: 'XCUZO0', date: "2020-02-01T00:00:03.243Z" total: 9.99, source: 'APP' }, { _id: 'XCUZO1', date: "2020-01-05T00:00:03.243Z" total: 9

问题 Who knows a better solution to group Orders by date and sum total and count by source. Of course I can group by Source and then I get only totals for this source only, I can alter the result thereafter to get the desired result. But I would like to know if it is possible in one simple $group statement. Eg. ordersByApp = 1, ordersByWEB = 2 Orders collection { _id: 'XCUZO0', date: "2020-02-01T00:00:03.243Z" total: 9.99, source: 'APP' }, { _id: 'XCUZO1', date: "2020-01-05T00:00:03.243Z" total: 9

问题 I have a query like this: galleryModel.find({_id: galleryId}) .populate({ model: 'User', path: 'objectId', select: 'firstName lastName' }) End response for objectId will be like this: objectId: { ... } How can I change it to user in response without changing real path? 回答1: You can do this by virtual populate, introduced in mongoose version 4.5 . For that you need to define a virtual field in mongoose schema. var GallerySchema = new mongoose.Schema({ name: String, objectId: { type: mongoose

问题 This question already has answers here : Async function returning promise, instead of value (3 answers) Closed 5 months ago . As my first real MERN project, I'm building a message board. I'm currently working on a node route to request the board names with their associated post count but I've hit an issue. Instead of getting the values that I need, I'm recieving info telling me there is a promise pending, which seems odd as I'm using async/await. Here's the function: exports.postsPerBoard =

问题 I need to query in database (mongoose) and get back the number of sales made each month of the year for one particular product (within one year period). I am new to node and mongoDb and I have come with a 'dummy' solution where I query in database and get back all the results for one product and than I use 3 loops to split the results in months but I think that it uses more resources than it should and it will use even more if it gets filled with more data, so I need help making a database

问题 I need to query in database (mongoose) and get back the number of sales made each month of the year for one particular product (within one year period). I am new to node and mongoDb and I have come with a 'dummy' solution where I query in database and get back all the results for one product and than I use 3 loops to split the results in months but I think that it uses more resources than it should and it will use even more if it gets filled with more data, so I need help making a database

问题 I have a studentSchema in which there are pass property with default value 0(means that time student does not having any concession pass). When student make a request for the pass , if the admin accept that request then student will gets his pass and the value of pass property gets updated to 1(means now student has the pass ) . And also this pass only available for some days e.g.one or two months . after one month has been completed student needs to request for the new pass. **codeshareio

问题 I want to find the subdocument in mongoose by subdocument id. i am doing : mainDoc.subDocFieldName.id(sudocId); But it shows 'cannot find property id of undefined' seems like mainDoc.subDocFieldName is undefined . so how do i access the sub document.? 回答1: I solved this problem by : mainDoc[subDocFieldName].id(sudocId); Actually I was using subDocument array. 来源： https://stackoverflow.com/questions/18586391/how-to-find-the-subdocument-via-subdocument-id-in-mongoose

问题 after seting my connections const mongoose = require('mongoose') const Post = require('./database/models/Post') mongoose.connect("mongodb://localhost/testdb", {useNewUrlParser: "true", useUnifiedTopology: true}) and my server page as below: const mongoose = require('mongoose') const app = new express() //mongoose.connect('mongodb://localhost/node-js-blog') //mongoose.connect("mongodb://localhost:27017/node-js-blog", {useNewUrlParser: "true",}) mongoose.connect('mongodb://localhost/node-js

问题 I've done a lot of research to find this answer to my problem, but I haven't discovered anything. Feel free to attach a link if I missed the answer. I did find this solution, but I'm not exactly sure how it might apply to this situation: E11000 duplicate key error index in mongodb mongoose I'm trying to connect my Express.js, MongoDB, Passport.js app to Mongo-Atlas. I have my Atlas cluster set up and accepting new Users from my localhost and using Google Oauth 2.0, however, when I try to