Alex DiLiberto alexdiliberto

Using ember-concurrency to easily load data inside a component

import { task } from 'ember-concurrency';
import { readOnly } from '@ember/object/computed';

export default Component.extend({
  tags: readOnly('loadTags.lastSuccessful.value'),

 loadTags: task(function * () {

{{!--
  Create a `/components/ui` directory to keep all of the ui presentational components

  In this example `ui-card` and `ui-selectable-list` are both simply presentational contextual components
--}}
{{#ui-card as |card|}}
  {{#card.header onClose=onClose}}
    Tags
 {{/card.header}}

ember-cli-mirage Tips and Tricks

Lock randomly generated data from faker for each test run for a consistent experience

// <project>/mirage/config.js
import { faker } from 'ember-cli-mirage'

// Lock randomly generated seed data from faker
faker.seed(123);

require('<module-prefix>/config/environment')
Grab the container from wherever and .lookup('config:environment')
From <meta> tag

app.import() works with node_modules now! As of Ember 2.15. Previously it only worked with bower_components and vendor.

Docs for app.import are here: https://ember-cli.com/managing-dependencies#standard-non-amd-asset

This method (vendor-shim) wraps the global export into an es6 module (but the global one is still present). It doesn't use an es6 interface even if the library offers one, but that's okay for my use case.

Things could still be easier, see this thread for the current state of that.

Convert MOV to GIF using FFmpeg and ImageMagick

I tried a few different techniques to make a GIF via command-line and the following gives me the best control of quality and size. Once you're all setup, you'll be pumping out GIFs in no time!

Preparation

Install FFmpeg

$ brew install ffmpeg [all your options]
- Example: $ brew install ffmpeg --with-fdk-aac --with-ffplay --with-freetype --with-frei0r --with-libass --with-libvo-aacenc --with-libvorbis --with-libvpx --with-opencore-amr --with-openjpeg --with-opus --with-rtmpdump --with-schroedinger --with-speex --with-theora --with-tools

Install ImageMagick

Introduction

Many people are confused by the {{mut}} helper because it seems very magical. This gist aims to help you construct a mental model for understanding what is going on when you use it.

History

Prior to the introduction of {{mut}}, form elements were two-way bound by default. That is, given this component:

import Ember from 'ember';
export default Ember.Component.extend({

Use yarn with Greenkeeper

When using yarn, it will create a yarn.lock lockfile which holds data on your used dependencies. This file also includes hard-typed versions, so should you update your dependencies, the yarn.lock file is basically outdated and needs to be regenerated. While yarn does this automatically, Greenkeeper pull requests that update dependencies as of right now do not do this regeneration, which means you would have to do it manually.

This gist shows you a way how to automatise this step using a Travis CI script.

Prerequisites

You use Travis CI and have it build Pull Requests (default behaviour)
You have a yarn.lock file in your repository for Travis CI to automatically install yarn (yarn will be added to their default images soon)

	import Ember from 'ember';

	const { get } = Ember;

	export default Ember.Component.extend({
	'did-insert'() {},
	'will-destroy'() {},

	didInsertElement() {
	this._super(...arguments);

	import Ember from 'ember';
	import Changeset from 'ember-changeset';
	import lookupValidator from 'ember-changeset-validations';

	export default Ember.Component.extend({
	init() {
	this._super(...arguments);

	let user = Ember.get(this, 'user');
	let validations = Ember.get(this, 'validations');