msmithstubbs

class Book < ApplicationRecord
 validates :title, presence: true
end


book = Book.new
> <Book id: nil, title: nil, author_id: nil, created_at: nil, updated_at: nil, genre: nil>

book.valid?
> false

msmithstubbs

A multi-column unique index

This example walks through enforcing a unique constraint on multiple columns.

As an example, let’s look at an appointment application for a vet surgery. Each customer has one or more pets. To ensure we don’t enter a customer’s pet twice we want to make sure a pet’s name is unique for that customer. This means the customer Jill can have a pet named Sparkles. Another customer, Bob, can also have a pet named Sparkles, but a customer cannot have more than one pet named Sparkles: Bob cannot have two cats named Sparkles.

Here’s an example schema:

Customers

msmithstubbs

# 1) Create your private key (any password will do, we remove it below)

$ cd ~/.ssh
$ openssl genrsa -des3 -out server.orig.key 2048


# 2) Remove the password

$ openssl rsa -in server.orig.key -out server.key

msmithstubbs

SHARED_SECRET = 'your_back_in_stock_api_key'

def verify_webhook(data, signature)
  digest  = OpenSSL::Digest::Digest.new('sha256')
  calculated_hmac = Base64.encode64(OpenSSL::HMAC.digest(digest, SHARED_SECRET, data)).strip
  calculated_hmac == signature
end

signature = request.headers["X-BIS-Signature"]
data = request.body

msmithstubbs

{
  "topic": "notification/sent",
  "timestamp": "2016-06-08 03:58:20 UTC",
  "customer": {
    "email": "[email protected]"
  },
  "product": {
    "product_id": 12345678,
    "variant_id": 98765432,
    "sku": "aliens-02"

msmithstubbs

html, body, ul, ol, li, form, fieldset, legend {
  margin: 0;
  padding: 0;
}

h1, h2, h3, h4, h5, h6, p { margin-top: 0; }

fieldset,img { border: 0; }

legend { color: #000; }

msmithstubbs

{% if customer.email %}
  <script>
    $(document).load(function() { // wait for app JS to load
      BISPopover.ready.then(function() {  // wait for Back in Stock to create the iframe
        var iframe = $('#BIS_frame').get(0); // find the iframe
      
        if (iframe) {
          $(iframe.contentDocument).find("#email_address").val('{{customer.email}}'); // set the email address field in the iframe
        }
      })

msmithstubbs

<div class="BIS_form">
  <label for="BIS_email">Email me when restocked</label>
  <input id="BIS_email" name="email" type="email" data-product-id="{{product.id}}" placeholder="[email protected]" value="{{customer.email}}">
  <button class="btn" id="BIS_button">Notify Me</button>
  <p class="BIS_response"> </p>
</div>

<style>
  .BIS_form {
   	background: #f5f5f5; 

msmithstubbs

<style>
  .BIS_form {
    text-align: center;
    margin-top: 20px;
    display: none;
  }
  
  .BIS_form label {
   	display: block; 
  }

msmithstubbs

<div>
  <label for="bis-email">Email me when available</label>
  <input type="email" id="bis-email">
  <label>
	  <input type="checkbox" id="bis-accepts-marketing">
    	Add me to the store mailing list
  </label>
  <button id="bis-submit">Email when available</button>
</div>