Trip Planner

A sample code for a DDD application. It's not a complete code ready for production, but it's working. You can follow the building steps, starting from first commit.

The purpose: planning a trip, choosing a leg for every date and a location for every leg.

Domain

• Trip has a name and at least one Route
• Trip has an identity; a Route has a name, and an internal identity
• Route can have one or more Leg; a Leg has a Date and an internal identity
• A Route can't have two Leg with same Data
• A Leg has a Location; a Location has a name and a Point
• Point has coordinates and the logic for distance calculation
• The Route knows the approximate road distance
• A route could be duplicated
• A duplicated Route could be added to the Trip
• Trade-off: removed InternalIdentity value object
• Fix: Date::input should be a DateTime
• Trade-off: we need a custom Event Dispatcher
• Trade-off: getters on commands, for integration with form

Application

• Command Handler: manages the flow "Command -> Use Case"
• CreateTrip Command and UseCase
• We need the Repository for Trip
• AddLegToRoute Command and UseCase
• UpdateLocation Command and UseCase
• We need validation: command validation using external service is a good trade-off
• Mmmh too many exceptions ... we need uniform responses
• Finally Events and Event Dispatcher

Infrastructure

• Framework's revenge: Symfony 2.5 and Doctrine 2.5
• InfrastructureBundle
• Mapping entities and value objects ... ops, Doctrine seems not work with a Value Object (with strategy auto) as identity for another entity
• Configuring services and creating Infrastructure services: Repository, Adapter for Validator, Validation ... ops, the Symfony's dispatcher does not fit

Presentation

• A simple controller with a form
• Symfony2 Form requires getters for the mapped entity