In my database, I have stored various Events using mongoDB. Each event comes with multiple fields, including an array of genres, which consists of subdocuments like {genre and subGenre}.
For instance, an event could be classified as {genre: "music", subGenre: "jazz"}, and {genre: "music", subGenre: "blues"}. These genre subdocuments are added to the "genres" array in the Event document within the database, as specified in the event.js model file.
Now, in my node application (refer to query.ts), I am attempting to create a query that enables users to search for events based on their genre preferences.
Key points:
- An Event is associated with an array of genres in the database,
- The user's preferences consist of an array of genres within the application.
I aim to devise a mongoDB query that fetches all Events having at least one matching {genre, subGenre} combination between the two arrays.
After exploring the $in Query Selector in the mongoDB documentation, it appears like I might need to utilize it. However, I am unsure how to construct a query programmatically that incorporates all values in the "searchGenres" variable defined in query.ts.
Thank you in advance for your feedback.
event.js: Mongoose definition for 'Events' in mongoDB - excerpt:
let mongoose = require('mongoose');
let EventSchema = new mongoose.Schema({
genres: [
{
genre: String,
subGenre: String
}
]
)};
module.exports = mongoose.model('Event', EventSchema);
query.ts:
import mongoose = require('mongoose');
let Event = require ('../models/event');
class Genre {
genre: string;
subGenre: string;
constructor (gen: string, sub: string) {
this.genre = gen;
this.subGenre = sub;
}
}
async function runQuery()
{
let searchGenres : Array<Genre> = new Array<Genre>();
// Populate searchGenres with some data here... e.g.
const searchGenre1 : Genre = new Genre ('music', 'jazz');
const searchGenre2 : Genre = new Genre ('music', 'rock');
searchGenres.push(searchGenre1);
searchGenres.push(searchGenre2);
// Query logic goes here:
// Return all events from the database where the 'genres' array
// in the document matches any element in the searchGenres array
// specified above.
const events = await Event.find ({
'genres': {?help? }
});
}