Prueba de Concepto GraphQL

Agregar inserts en:

priv/repo/seeds.exx

mix ecto.setup

Ver playground en http://localhost:4000/graphiql

Phoenix Contexts

• Context: encapsulate domain logic
• DDD Domain Driven Design Eric Evans 2003: software pattern

mix phx.gen.html Identity User users name:string email:string

Context: Identity Model: User { name, email }

The controllers call Identity for CRUD operations

mix phx.gen.html Identity Car cars model:string

You add more models to the same context, and then see how identity.ex is updated with the new verbs instead of have model packages

Contexts:

• Only expose methods at their outer layer
• Contexts hide internal implementations
• Use domain language when naming actions, entities and concepts

What ahppens when we need to use a Use in a different context?

• Direct Usage: import the complete context module in the context required
• Struct Conversion: Useful for read-only
• Collaborator Schema: Create an internal schema persisted in Ecto that uses a reference to the external schema

We want the context for have this in the controllers:

|> Marketing.visitor_for_user()
|> Marketing.subscribe_visitor_to_mail()

Check how to parse structs and receive structs in the functions

Recommendable:

NOT

	defmodule Automax.Inpection_context do
		def get_vehicle()
		def get_vehicle_rating()
		def get_vehicle_list_price()
	end

DO

	defmodule Automax.Inpection_context do
		def get_vehicle()
		# => %Vehicle{ rating: %Rating{}, list_price: %ListPrice{}}
	end

NOT

	def update_rating( rating_id, new_rating1)...

DO

	def rate_vehicle( vehicle_id, new_rating1)...

Event-driven messaging

https://github.com/otobus/event_bus