En este capítulo, nos gustaría volver a nuestro modelo de dominio para hablar de invariantes y restricciones, y ver cómo nuestros objetos de dominio pueden mantener su propia coherencia interna, tanto conceptualmente como en el almacenamiento persistente. Discutiremos el concepto de límite de consistencia y mostraremos cómo hacerlo explícito puede ayudarnos a construir software de alto rendimiento sin comprometer la mantenibilidad.
La Figura 7-1 muestra un avance de hacia dónde nos dirigimos: introduciremos un nuevo objeto modelo llamado Product para envolver varios lotes, y en su lugar haremos que el antiguo servicio de dominio allocate() esté disponible como método en Product.
Figura 7-1. Añadir el agregado Producto
¿Por qué? Averigüémoslo.
Consejo
El código de este capítulo está en la rama appendix_csvsde GitHub:
git clone https://github.com/cosmicpython/code.git
cd code
git checkout appendix_csvs
# or to code along, checkout the previous chapter:
git checkout chapter_06_uow
¿Por qué no ejecutarlo todo en una hoja de cálculo?
¿Qué sentido tiene un modelo de dominio? ¿Cuál es el problema fundamental que intentamos resolver?
¿No podríamos hacerlo todo en una hoja de cálculo? Muchos de nuestros usuarios estarían
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