Es hora de cumplir nuestra promesa de utilizar el principio de inversión de dependencias como forma de desacoplar nuestra lógica central de las preocupaciones infraestructurales.
Presentaremos el patrón Repositorio, una abstracción simplificadora sobre el almacenamiento de datos, que nos permite desacoplar nuestra capa de modelo de la capa de datos. Presentaremos un ejemplo concreto de cómo esta abstracción simplificadora hace que nuestro sistema sea más comprobable al ocultar las complejidades de la base de datos.
La Figura 2-1 muestra un pequeño avance de lo que vamos a construir: un objeto Repository que se sitúa entre nuestro modelo de dominio y la base de datos.
Figura 2-1. Antes y después del patrón Repositorio
Consejo
El código de este capítulo está en la rama chapter_02_repository de GitHub.
git clone https://github.com/cosmicpython/code.git
cd code
git checkout chapter_02_repository
# or to code along, checkout the previous chapter:
git checkout chapter_01_domain_model
Persistencia de nuestro modelo de dominio
En el Capítulo 1 construimos un modelo de dominio sencillo que puede asignar pedidos a lotes de existencias. Nos resulta fácil escribir pruebas contra este código porque no hay dependencias ni infraestructura que ...
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