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Rails 5.0 Rails 5.1+ changed? → saved_change_to? _was → _before_last_save changed? → saved_changes? changed_attributes → saved_changes.transform_values(&:first)

Model callbacks behavior After Rails 4.x release, some changes were made on callbacks to split update on the model before and after writing data to the database. We had to be careful to use the correct helpers: _changed? for after_save callbacks, and previous_changes[:] for after_commit callbacks:

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# Assignment
## Environment

### Backend
- Ruby 2.6.3
- Rails 6.0.3.2
- PostgreSQL) 12.3

### Frontend
- Angular: 10.0.5

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# app/controllers/api/v1.rb

class Api::V1 < Grape::API
  class Grape::Middleware::Error
    def error_message(code, text)
      {
        :error => {
          :code => code,
          :message => text
        }

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// source: http://stackoverflow.com/questions/16491758/remove-objects-from-array-by-object-property

// we have an array of objects, we want to remove one object using only the id property
var apps = [{id:34,name:'My App',another:'thing'},{id:37,name:'My New App',another:'things'}];

// get index of object with id:37
var removeIndex = apps.map(function(item) { return item.id; }).indexOf(37);

// remove object
apps.splice(removeIndex, 1);

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source 'https://rubygems.org'

gem 'mechanize'

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/* jshint strict: false */
/* globals require, console */
var gulp = require('gulp');
var exit = require('gulp-exit');

var browserify = require('browserify');
var watchify = require('watchify');
var babelify = require('babelify');

var source = require('vinyl-source-stream');

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{
  "editor.tabSize": 2,
  "terminal.integrated.shell.windows": "C:\\Program Files\\Git\\bin\\bash.exe",
  "files.trimTrailingWhitespace": true,
  "sublimeTextKeymap.promptV3Features": true,
  "editor.multiCursorModifier": "ctrlCmd",
  "editor.snippetSuggestions": "top",
  "editor.formatOnPaste": true,
  "editor.fontSize": 15,
  "ruby.rubocop.executePath": "/Users/t_m_tran/.rvm/gems/ruby-2.4.2/bin/",

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=Navigating=
    visit('/projects')
    visit(post_comments_path(post))

=Clicking links and buttons=
    click_link('id-of-link')
    click_link('Link Text')
    click_button('Save')
    click('Link Text') # Click either a link or a button
    click('Button Value')

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Sublime Text 3 Setup

Install Package Control

Install Package Control for easy package management.

1. Open the console with Ctrl+`
2. Paste in the following: