Decoupling Drupal modules into PHP libraries: a Commerce 2.x primer

Bojan Zivanovic
Commerce Development Lead at Commerce Guys

Commerce Guys

Paris | London | Ann Arbor, MI

Creators of Platform.sh and Drupal Commerce

We're a Drupal powered eCommerce company now headquartered in Paris with offices in London and Ann Arbor. We formed the international company through a small merger in 2010 to create Drupal Commerce and Platform.sh. We're now up to around 60 people, about 25% distributed, delivering a wide variety of projects across North America and Europe.

Our story has always been based around solving the hard parts of eCommerce together; the first time we ever cooperated as an international team, in fact, was to develop a new site for a global brand that was multilingual, multi-currency, and with locale specific payment gateways and product availability. It was hard. Very hard. We still see the ghost of that project wandering around our office. We were still using Ubercart at the time and knew we needed to do better.

So we created Drupal Commerce!

3.5 years since the first release...

And now we start from scratch

Re-evaluating our problem space

Libraries first

Influencing symfony/intl

Territorial groupings

California and Nevada
European Union
Germany and a set of Austrian postal codes (6691, 6991, 6992, 6993)
Austria without specific postal codes (6691, 6991, 6992, 6993)

Coming to a SaaS near you

More to come

Why?

Re-examine your problem space.
Get additional exposure.
Validate your implementation
Get development/maintenance help.
Allow for backports.

The (not so) hidden cost

The anatomy of a library

Data model - The basics

Data model - Traits

Data model - Collections

Data model - Repository

Services

Tips & Tricks

Translatable strings

Pluggable implementations

Know when to stop!

Library ideas: which problems to tackle

Hard problems

Boring problems

Are you saving me time?

Nobody cares about your CartInterface.