feature/mensajes-claros-en-eliminar-clases

backend/api/v1/modules/a76/classes/service.py

@@ -370,11 +370,46 @@ class ClassService:
     def delete(db: Session, class_id: int, tenant_id: int, company_id: int) -> bool:
         """Delete a class (and its FA extension if exists)"""
         from api.v1.modules.a24.fa.fa_classes.models import QClasses
-        
+        from api.v1.modules.a76.items.models import LineItem
+        from api.v1.modules.a76.parts.models import Part
+
         class_obj = ClassService.get_by_id(db, class_id, tenant_id, company_id)
         if not class_obj:
             return False
 
+        used_in_parts = (
+            db.query(Part.id)
+            .filter(
+                Part.part_class == class_obj.class_code,
+                Part.tenant_id == tenant_id,
+                Part.company_id == company_id,
+            )
+            .first()
+            is not None
+        )
+        used_in_invoices = (
+            db.query(LineItem.id)
+            .filter(
+                LineItem.class_id == class_id,
+                LineItem.tenant_id == tenant_id,
+                LineItem.company_id == company_id,
+            )
+            .first()
+            is not None
+        )
+
+        if used_in_parts or used_in_invoices:
+            reasons: list[str] = []
+            if used_in_parts:
+                reasons.append("partes")
+            if used_in_invoices:
+                reasons.append("facturas")
+            usage = " y ".join(reasons)
+            raise HTTPException(
+                status_code=409,
+                detail=f"No se puede eliminar la clase porque ya fue utilizada en {usage}.",
+            )
+
         # Delete FA extension first (if exists) to avoid FK constraint violation
         fa_extension = db.query(QClasses).filter(
             QClasses.class_id == class_id,