mongoose

问题 I have an API that in order to insert a new item it needs to be validated. The validation basically is a type validator( string , number , Date , e.t.c) and queries the database that checks if the "user" has an "item" in the same date, which if it does the validation is unsuccessful. Pseudocode goes like this: const Item = require("./models/item"); function post(newDoc){ let errors = await checkForDocErrors(newDoc) if (errors) { throw errors; } let itemCreated = await Item.create(newDoc);

问题 I have an API that in order to insert a new item it needs to be validated. The validation basically is a type validator( string , number , Date , e.t.c) and queries the database that checks if the "user" has an "item" in the same date, which if it does the validation is unsuccessful. Pseudocode goes like this: const Item = require("./models/item"); function post(newDoc){ let errors = await checkForDocErrors(newDoc) if (errors) { throw errors; } let itemCreated = await Item.create(newDoc);

问题 I have an API that in order to insert a new item it needs to be validated. The validation basically is a type validator( string , number , Date , e.t.c) and queries the database that checks if the "user" has an "item" in the same date, which if it does the validation is unsuccessful. Pseudocode goes like this: const Item = require("./models/item"); function post(newDoc){ let errors = await checkForDocErrors(newDoc) if (errors) { throw errors; } let itemCreated = await Item.create(newDoc);

问题 I have an API that in order to insert a new item it needs to be validated. The validation basically is a type validator( string , number , Date , e.t.c) and queries the database that checks if the "user" has an "item" in the same date, which if it does the validation is unsuccessful. Pseudocode goes like this: const Item = require("./models/item"); function post(newDoc){ let errors = await checkForDocErrors(newDoc) if (errors) { throw errors; } let itemCreated = await Item.create(newDoc);

问题 I am using the library https://github.com/szokodiakos/typegoose to create mongoose models. Item.ts export class Item extends Typegoose { } const ItemModel = new Item().getModelForClass(Item); export default ItemModel; User.ts import { InventoryItem } from "./InventoryItem"; export class BagItem extends Typegoose { @prop({ ref: Item }) Item?: Ref<Item>; @prop() Quantity: Number; } export class User extends Typegoose { @arrayProp({ items: BagItem }) Bag?: BagItem[]; } export const BagItemModel

问题 I am using the library https://github.com/szokodiakos/typegoose to create mongoose models. Item.ts export class Item extends Typegoose { } const ItemModel = new Item().getModelForClass(Item); export default ItemModel; User.ts import { InventoryItem } from "./InventoryItem"; export class BagItem extends Typegoose { @prop({ ref: Item }) Item?: Ref<Item>; @prop() Quantity: Number; } export class User extends Typegoose { @arrayProp({ items: BagItem }) Bag?: BagItem[]; } export const BagItemModel

问题 I am configuring Mongoose to work on an existing MongoDB, that has these two collections: Users - with fields: _id: ObjectId name: String org_id: ObjectId Organizations - with fields: _id: ObjectId name: String I want to be able to populate a User document by Organization data. So I've created these two Models: const userSchema = new Schema({ name: String, org_id: { type: Schema.Types.ObjectId, ref: 'Organization', }, }); const User = mongoose.model('User', userSchema); const

问题 I have two collections. articles and bookmarks. articles { _id: "5faa889ade5e0a6326a873d3", name: "article 1" }, { _id: "5faa889ade5e0a6326a873d", name: "article 2" } bookmarks { _id: "5faa889ade5e0a6326a873d1", user_id: "5fc7b50da483a66a86aa7e9e", model_id: "5faa889ade5e0a6326a873d3" } I want to join article with bookmark. if user bookmarked a article. what i have tried const aggregate = await Articles.aggregate([{ $lookup: { from: "categories", localField: "category_id", foreignField: "_id"

问题 Mongoose updateMany with different values by unique id like email Old BD Data: usersCollection = [ { _id: 1, email: "one@gmail.com", name: "one" }, { _id: 2, email: "two@gmail.com", name: "two" }, { _id: 3, email: "three@gmail.com", name: "three" } ]; Coming Data: users = [ { email: "one@gmail.com", name: "oneeee" }, { email: "two@gmail.com", name: "twoooo" }, { email: "three@gmail.com", name: "three" }, { email: "three@gmail.com", name: "four" } ]; What I'm expecting to to have after insert

问题 I have a model Entry to which includes details of a hospital at a particular time. The data looks like this: { "_id": "5ef9c7337874820008c1a026", "date": 1593427763640, //... some data "hospital": { "_id": "5ef8d06630c364000840bb6d", "name": "City Hospital", //... some data }, } I want to get the last query of each day grouped by the hospital ID. In MySQL, it can be achieved using INNER JOIN. How can I do it using MongoDB? 回答1: Given a day, calculate start and end of a day. This is to be used