Usama Ashraf UsamaAshraf

I'm a multilingual developer trying to build impactful software.

UsamaAshraf / nested-resources.rb

Created May 23, 2021 16:58

	class PostSerializer < ActiveModel::Serializer
	attributes :id, :title, :details, :author
	def author
	object.get_author_lazily do \|author\|
	# Serialize the author after it has been loaded.
	ActiveModelSerializers::SerializableResource
	.new(author)
	.as_json[:user]
	end
	end

UsamaAshraf / batch-loader.rb

Created May 23, 2021 16:57

	class PostSerializer < ActiveModel::Serializer
	attributes :id, :title, :details, :author
	def author
	object.get_author_lazily
	end
	end

	class Post
	def get_author_lazily
	# The current post object is added to the batch here,

UsamaAshraf / two-queries.rb

Created May 23, 2021 16:54

	posts = Post.all
	author_ids = posts.pluck(:author_id)
	authors = User.where(:_id.in => author_ids)
	# Somehow pass the author objects to the post serializer and
	# map them to the correct post objects. Can't imagine what
	# exactly that would look like, but probably not pretty.
	render json: posts, pass_some_parameter_maybe: authors

UsamaAshraf / mongoid-example.rb

Created May 23, 2021 16:52

	class PostSerializer < ActiveModel::Serializer
	attributes :id, :title, :details, :author
	# Will run n Mongo queries for n posts being rendered.
	def author
	User.find(object.author_id)
	end
	end

	# This is now a Mongoid document, not an ActiveRecord model.
	class User

UsamaAshraf / eager-loading.rb

Created May 23, 2021 16:50

	class PostsController < ApplicationController
	def index
	# Runs a SQL join with the users table.
	posts = Post.includes(:author).all

	render json: posts
	end
	end

UsamaAshraf / init-code.rb

Created May 23, 2021 16:49

	class PostsController < ApplicationController
	def index
	posts = Post.all

	render json: posts
	end
	end

	class Post
	belongs_to :author, class_name: 'User'

UsamaAshraf / send_email_on_registration.js

Created November 4, 2018 12:21

	module.exports = (user) => {
	setImmediate(() => {
	// Send a welcome email or whatever.
	});
	}

UsamaAshraf / chat_user.js

Last active November 3, 2018 16:41

	class ChatUser {

	displayNewMessageNotification(newMessage) {
	// Push an alert message or something.
	}

	// `chatroom` is an instance of EventEmitter.
	connectToChatroom(chatroom) {
	chatroom.on('message-received', this.displayNewMessageNotification);
	}

UsamaAshraf / subscriptions.js

Created November 3, 2018 16:03

	const myEmitter = require('./my_emitter');
	const sendEmailOnRegistration = require('./send_email_on_registration');
	const someOtherListener = require('./some_other_listener');
	const doSomethingEntirelyDifferent = require('./do_something_entirely_different');


	myEmitter.on('user-registered', sendEmailOnRegistration);
	myEmitter.on('user-registered', someOtherListener);

	myEmitter.on('user-registered:activated', doSomethingEntirelyDifferent);

UsamaAshraf / registration_handler.js

Created November 3, 2018 16:01

	const myEmitter = require('./my_emitter');

	// Perform the registration steps

	// The application should react differently if the new user has been activated instantly.
	if (user.activated) {
	myEmitter.emit('user-registered:activated', user);

	} else {
	myEmitter.emit('user-registered', user);