zakariaf

Rails 7 new features. Before and After

• Add ComparisonValidator
• PostgreSQL generated columns
• PostgreSQL custom enum types
• Add tracking of belongs_to association
• association_previously_changed? method
• Add invert_where method
• Add associated method
• Add missing method
• Active Record Encryption

myogeshchavan97

// add all the elements inside modal which you want to make focusable
const  focusableElements =
    'button, [href], input, select, textarea, [tabindex]:not([tabindex="-1"])';
const modal = document.querySelector('#exampleModal'); // select the modal by it's id

const firstFocusableElement = modal.querySelectorAll(focusableElements)[0]; // get first element to be focused inside modal
const focusableContent = modal.querySelectorAll(focusableElements);
const lastFocusableElement = focusableContent[focusableContent.length - 1]; // get last element to be focused inside modal

francisrstokes

import React from 'react';

export class StateDispatcher extends React.Component {
  constructor(props) {
    super(props);
    this.state = props.state || {};
    this._dispatch = this.dispatch.bind(this);
  }

  dispatch(action) {

ryderstorm

# the instructions from here: https://stackoverflow.com/questions/3704919/installing-rmagick-on-ubuntu/31089915#31089915
# worked, but only after I added in line 8

sudo apt-get purge graphicsmagick graphicsmagick-dbg imagemagick-common imagemagick imagemagick-6.q16 libmagickcore-6-headers libmagickwand-dev graphicsmagick-libmagick-dev-compat
sudo apt-get autoremove
sudo apt-get install imagemagick libmagickwand-dev
sudo ln -s /usr/lib/x86_64-linux-gnu/ImageMagick-6.8.9/bin-Q16/Magick-config /usr/bin/Magick-config
export PKG_CONFIG_PATH=/usr/lib/x86_64-linux-gnu/pkgconfig
gem install rmagick

mankind

http://stackoverflow.com/questions/22667401/postgres-json-data-type-rails-query
http://stackoverflow.com/questions/40702813/query-on-postgres-json-array-field-in-rails

#payload: [{"kind"=>"person"}]
Segment.where("payload @> ?", [{kind: "person"}].to_json)

#data: {"interest"=>["music", "movies", "programming"]}
Segment.where("data @> ?",  {"interest": ["music", "movies", "programming"]}.to_json)
Segment.where("data #>> '{interest, 1}' = 'movies' ")
Segment.where("jsonb_array_length(data->'interest') > 1")

phansch

NOTE: This is outdated. Check the comments below for more up-to-date forks of this gist.

Improved YARD CHEATSHEET http://yardoc.org

forked from https://gist.github.com/chetan/1827484 which is from early 2012 and contains outdated information.

• Official Getting Started Guide
• Official Tags documentation
• Type naming examples

danielgtaylor

Moving to ES6 from CoffeeScript

I fell in love with CoffeeScript a couple of years ago. Javascript has always seemed something of an interesting curiosity to me and I was happy to see the meteoric rise of Node.js, but coming from a background of Python I really preferred a cleaner syntax.

In any fast moving community it is inevitable that things will change, and so today we see a big shift toward ES6, the new version of Javascript. It incorporates a handful of the nicer features from CoffeeScript and is usable today through tools like Babel. Here are some of my thoughts and issues on moving away from CoffeeScript in favor of ES6.

While reading I suggest keeping open a tab to Babel's learning ES6 page. The examples there are great.

Punctuation

Holy punctuation, Batman! Say goodbye to your whitespace and hello to parenthesis, curly braces, and semicolons again. Even with the advanced ES6 syntax you'll find yourself writing a lot more punctuatio

tkafka

The MIT License (MIT)

Copyright (c) 2014 Tomas Kafka

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

rocco

# list connected devices and emulators
# this outputs a list of attached/running [device-id]s

adb devices

# ----------------------------------------------------

# list all installed apps on device
# outputs all [package-id]s of installed apps
# from: http://stackoverflow.com/questions/4032960/how-do-i-get-an-apk-file-from-an-android-device#18003462

kdzwinel

function getTrilateration(position1, position2, position3) {
    var xa = position1.x;
    var ya = position1.y;
    var xb = position2.x;
    var yb = position2.y;
    var xc = position3.x;
    var yc = position3.y;
    var ra = position1.distance;
    var rb = position2.distance;
    var rc = position3.distance;