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Beautiful Models In PHP
       By Brandon Savage
Do your models look like this?
You never wanted your
 code to look this way.


      Let’s fix it.
Who am I?
•   Software engineer at
    Mozilla.

•   Blogger, speaker, author
    of Mastering Object
    Oriented PHP

•   Instrument rated private
    pilot.
Questions we’ll answer
1.What is a model?
2.What are the components of a model?
3.How do you design a model?
4.What parts of an app belong in a model?
5.What parts of an app do not belong in a
  model?

           (last bullet slide I swear!)
What is a model?
(Conceptual) Model - a method for
representing ‘concepts’ (entities) and the
 relationship between them. (Wikipedia)
A model is a method of
 representing data in a
      logical way.
Friends
                                           Blog posts
Customers
                         News stories

        Sermons                         Users

               Clients
                                    Political parties
Transactions

                     Television shows
                                         Comments
               Lovers
Sometimes models map directly to
       a database table.


    A lot of times they don’t.
Models != Database
      Tables
In fact, models may not
 have databases at all.
MySQL/PostgreSQL
REST APIs
                   Amazon
                                  Redis
  Elastic Search

                   Memcache
    APC                               MongoDB


                        File system
   Web services
                                      Other web apps
What are the
components of a model?
1. The thing you’re
     modeling.
Friends
                                           Blog posts
Customers
                         News stories

        Sermons                         Users

               Clients
                                    Political parties
Transactions

                     Television shows
                                         Comments
               Lovers
2. The place the data is
        stored.
MySQL/PostgreSQL
REST APIs
                   Amazon
                                  Redis
  Elastic Search

                   Memcache
    APC                               MongoDB


                        File system
   Web services
                                      Other web apps
3. The method for
interacting with these
      two items.
Domain modeling
Single responsibility
      principle
How do you design a
     model?
Start with a question:
what am I modeling?
Bank customers have
     accounts.


They also have phone
      numbers.
<?php

class Customer { ... }




<?php

class PhoneNumber { ... }




<?php

class Account { ... }
<?php

class Customer {
  protected $phone_numbers = array();
  protected $accounts = array();

    public function get_phone_numbers() { ... }

}




<?php

class Account {

    protected $customer;

}
Each value object is
 populated by the
  gateway object.
Items that can be
modeled individually
    should be.
Items that are too small
  to model individually
      shouldn’t be.
What parts of an app
 belong in a model?
Data storage and
retrieval operations
Business logic
Validation logic
What parts of an app
 do not belong in a
      model?
Display logic
Object creation
Data passing and
   collection
Want to learn more?
              Stop struggling with
              object oriented PHP.
              Start mastering it
              instead.
              DC PHP members get 10% off!
              Use DCPHP10 at checkout.


www.masteringobjectorientedphp.com
The Object Oriented
      PHP Masterclass
Get hands on experience using what you just learned.

        Coming in March. Seats are limited!

      Sign up for updates at brandonsavage.net
Questions?

•   Email: brandon@brandonsavage.net

•   Twitter: @brandonsavage

•   Website: http://www.brandonsavage.net

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Beautiful Models in PHP