Meteor’s Data System: Advanced Usage

Optimizing Performance

1. Optimize Publication Queries: Make sure your publication queries are efficient and only return necessary data.

jsCopy codeMeteor.publish('items', function () { return Items.find({}, { fields: { name: 1, quantity: 1 } }); });

1. Use Meteor.publishComposite for Complex Data: For publications that need to return related data, you can use the matb33:collection-hooks or reywood:publish-composite packages.

bashCopy codemeteor add reywood:publish-composite

import { PublishComposite } from 'meteor/reywood:publish-composite'; Meteor.publishComposite('itemsWithComments', function () { return { find() { return Items.find(); }, children: [ { find(item) { return Comments.find({ itemId: item._id }); } } ] }; });

1. Use Meteor.defer for Delayed Execution: To avoid blocking the main thread, use Meteor.defer for code that doesn’t need to be executed immediately.

jsCopy codeMeteor.defer(() => { // This code runs later, after the current event loop. });

Schema Validation with aldeed:simple-schema

1. Define Schema:

import SimpleSchema from 'simpl-schema'; const ItemSchema = new SimpleSchema({ name: { type: String, min: 1, max: 100 }, quantity: { type: Number, min: 0 } }); Items.attachSchema(ItemSchema);

1. Validation on the Server:

Meteor.methods({ 'addItem': function (item) { check(item, ItemSchema); Items.insert(item); } });