Clay Stewart clamstew

`form_for` 'helper' method

Up until now we have looked at the create and update controller action in Rails in the context of using a basic <html> form tag, <form></form>.

When you wanted to POST a new movie to your Metube app:

'new' action

First you made a new controller-action in your videos controller. This action was mapped to the GET route that loaded the new video form from the views/videos/new.html.erb file with a route that looks like get "/videos/new", to: "videos#new" in the routes.rb file.

Looking at the new action in the videos controller, it's time to come clean. There was really no reason in the previous Rails CRUD lesson with the new action that we needed to hand down this instance variable:

Why Polymorphic Associations:

This was a question from @photonerddan during class, and after looking through many examples online approaching it from an inheritance stance, as well as ones with examples that seemed outside of common use-cases, Mike and I decided to approach it from a problem / solution standpoint, which looks at it from a database perspective.

We will cover it more in-depth during the second week of Rails MakerSquare, but for now here is a short example to highlight the problem that polymorphism is solving in your database.

So let's start with the problem it is solving:

Polymorphism keeps you from having excessive foreign key columns in a database table where multiple things, such as notification feed items, are owned by other objects.

Partner Exercise 4:

**View concepts we will cover: **

more practice with the Foundation CSS framework and writing minimal layout css
using partials to encapsulate parts of your layout
using partials and passing in local variables for repeating elements
using font-awesome icon set for rapid prototyping

#What Are Javascript Callback Functions?

###Functions as Arguments

By now it should be clear that we can pass variables and objects into Javascript functions as arguments. For example, given:

// assign the string "Bob" to a variable 'name'
var name = "Bob";
// assign a function that returns a phrase as uppercase string

	<!DOCTYPE html>
	<html>
	<head>
	<style>
	body {margin: 0;}
	.container {
	margin: 0 auto;
	width: 800px;
	background: aliceblue;
	}

	require 'digest/md5'
	# make an email array for images you want to find
	array_emails = ["email1", ...]
	# make a new hash to store email:image_url as a key value pair
	hash_email_image = {}

	def gravatar_for(email, options = { size: 50 })
	gravatar_id = Digest::MD5::hexdigest(email.downcase)
	size = options[:size]
	gravatar_url = "https://secure.gravatar.com/avatar/#{gravatar_id}?s=#{size}"

	[
	{
	"sha": "a26394d7481d439e41f18b5d2efd08f64daaa5d4",
	"commit": {
	"author": {
	"name": "Xavier Noria",
	"email": "fxn@hashref.com",
	"date": "2014-02-19T16:53:13Z"
	},
	"committer": {

	<div class="off-canvas-wrap">
	<div class="inner-wrap">
	<nav class="tab-bar">
	<section class="left-small">
	<a class="left-off-canvas-toggle menu-icon" ><span></span></a>
	</section>
	<%= render 'layouts/mobile_menu_btn' %>

	<section class="middle tab-bar-section" style="">
	<div style="width: 100%; text-align: left; margin-left: 0em;"><span style="font-weight: 800; font-size: 1.5em;">MAKER</span><span><%= image_tag "course/logo.png", {class: "logo", alt: "Logo", style: "margin: 0px 2px; margin-bottom: 10px;width: 30px"} %></span><span style="font-weight: 300; font-size: 1.5em;">SQUARE</span></div>

	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8">
	<title>Eterna \| Think of anything right now</title>
	<!-- Latest compiled and minified CSS -->
	<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/bootstrap/3.0.2/css/bootstrap.min.css" />
	<!-- put in font awesome -->
	<link href="http://netdna.bootstrapcdn.com/font-awesome/4.0.3/css/font-awesome.css" rel="stylesheet">

Clay Stewart clamstew

form_for 'helper' method

'new' action

Why Polymorphic Associations:

Partner Exercise 4:

`form_for` 'helper' method