modified: netbox_services/engine/__init__.py

modified:   netbox_services/engine/allocators.py
modified:   netbox_services/engine/context.py
new file:   netbox_services/engine/mappers.py
modified:   netbox_services/engine/resolver.py
new file:   netbox_services/engine/templating.py
modified:   netbox_services/forms.py
modified:   netbox_services/models.py
modified:   netbox_services/tests/test_allocators.py
new file:   netbox_services/tests/test_mappers.py
modified:   netbox_services/tests/test_resolver.py
new file:   netbox_services/tests/test_templating.py
Simplify layout to template and service instances

netbox_services/models.py

@@ -112,6 +112,8 @@ def validate_tree(tree):
             raise ValidationError({"tree": _(f"Node '{name}': selector must be a dict.")})
         if allocation and not isinstance(allocation, dict):
             raise ValidationError({"tree": _(f"Node '{name}': allocation must be a dict.")})
+        if allocation and "attrs" in allocation and not isinstance(allocation["attrs"], dict):
+            raise ValidationError({"tree": _(f"Node '{name}': allocation.attrs must be a dict.")})
 
         scope = node.get("scope", "parent")
         if scope not in RequirementScopeChoices.values():