fn_registry/functions/datascience/diff_entities.md

name, kind, lang, domain, version, purity, signature, description, tags, uses_functions, uses_types, returns, returns_optional, error_type, imports, params, output, tested, tests, test_file_path, file_path

name	kind	lang	domain	version	purity	signature	description	tags	uses_functions	uses_types	returns	returns_optional	error_type	imports	params	output	tested	tests	test_file_path	file_path
diff_entities	function	go	datascience	1.0.0	pure	func DiffEntities(before, after []map[string]any, key string, ignoreFields []string) map[string]any	Compara dos snapshots de entities y devuelve diferencias campo a campo. Detecta añadidas, eliminadas, modificadas e inalteradas. Ignora created_at y updated_at por defecto (pasar nil para usar defaults).	datascience diff entities operations snapshot comparison pendiente-usar				false		fmt	name desc before slice de snapshots de entities antes (ej: resultado de query anterior) name desc after slice de snapshots de entities después (ej: resultado de query actual) name desc key nombre del campo clave para emparejar entities (ej: 'id', 'uuid') name desc ignoreFields slice de nombres de campos a ignorar en comparación (nil usa defaults ['created_at', 'updated_at'])	mapa con 'summary', 'added', 'removed', 'modified', 'unchanged' - análisis completo de diferencias	true	entity añadida entity eliminada entity modificada con detalle de campos entities identicas → unchanged ignore_fields funciona lista vacia vs lista con datos summary format correcto	functions/datascience/diff_entities_test.go	functions/datascience/diff_entities.go

Ejemplo

before := []map[string]any{
    {"id": "1", "name": "Alice", "status": "active"},
    {"id": "2", "name": "Bob"},
}
after := []map[string]any{
    {"id": "1", "name": "Alice", "status": "inactive"},
    {"id": "3", "name": "Carol"},
}
result := DiffEntities(before, after, "id", nil)
// result["summary"] = "1 added, 1 removed, 1 modified, 0 unchanged"
// result["added"] = [{"id": "3", "name": "Carol"}]
// result["removed"] = [{"id": "2", "name": "Bob"}]
// result["modified"] = [{"key": "1", "changes": {"status": {"old": "active", "new": "inactive"}}}]

Notas

Funcion pura. Compara valores con fmt.Sprintf("%v", ...) para manejar tipos heterogeneos en map[string]any. ignoreFields nil usa los defaults ["created_at", "updated_at"]. Para no ignorar ningun campo, pasar []string{}. Semantica identica a diff_entities_py_datascience, permite comparar resultados entre ejecuciones del mismo pipeline.