🐛 Container requires other container (#1027)

# Description

We fail to look-up required containers.
### Bug

![image](https://github.com/user-attachments/assets/0e2f554f-74dc-4140-b1d6-6d74d1abbad5)


## Bump

- [x] Patch
- [ ] Minor
- [ ] Skip

## Changelog
### Fixed

- The `neat.read.cdf()` and `neat.read.yaml(..., format="toolkit")` no
longer give a `ResourceNotFoundError` for containers that are required
by the containers in the model and exists in CDF.

cognite/neat/_rules/models/dms/_validation.py

@@ -2,7 +2,6 @@
 from collections import Counter, defaultdict
 from collections.abc import Mapping
 from functools import lru_cache
-from typing import ClassVar
 
 from cognite.client import data_modeling as dm
 from cognite.client.data_classes.data_modeling import ContainerList, ViewId, ViewList
@@ -59,10 +58,6 @@ class DMSValidation:
     """This class does all the validation of the DMS rules that have dependencies between
     components."""
 
-    # When checking for changes extension=addition, we need to check if the new view has changed.
-    # For example, changing the filter is allowed, but changing the properties is not.
-    changeable_view_attributes: ClassVar[set[str]] = {"filter"}
-
     def __init__(
         self,
         rules: DMSRules,
@@ -96,6 +91,11 @@ def imported_views_and_containers_ids(
                 imported_views.add(prop.view)
             view_with_properties.add(prop.view)
 
+        for container in self._containers or []:
+            for required in container.constraint or []:
+                if required not in existing_containers:
+                    imported_containers.add(required)
+
         if include_views_with_no_properties:
             extra_views = existing_views - view_with_properties
             imported_views.update({view for view in extra_views})

tests/tests_unit/rules/test_models/test_dms_rules.py

@@ -36,7 +36,7 @@
     DMSValidation,
 )
 from cognite.neat._rules.models.dms._exporter import _DMSExporter
-from cognite.neat._rules.models.entities._single_value import UnknownEntity, ViewEntity
+from cognite.neat._rules.models.entities._single_value import ContainerEntity, UnknownEntity, ViewEntity
 from cognite.neat._rules.transformers import (
     DMSToInformation,
     InformationToDMS,
@@ -1779,3 +1779,32 @@ def test_edge_types_by_view_property_id(
         actual = exporter._edge_types_by_view_property_id(properties_by_view_id, view_by_id)
 
         assert actual == expected_edge_types_by_view_property_id
+
+
+class TestDMSValidation:
+    @pytest.mark.parametrize(
+        "input_rules, expected_views, expected_containers",
+        [
+            pytest.param(
+                DMSInputRules(
+                    DMSInputMetadata("my_space", "MyModel", "Me", "v1"),
+                    properties=[
+                        DMSInputProperty("MyView", "name", "text", container="MyContainer", container_property="name"),
+                    ],
+                    views=[DMSInputView("MyView")],
+                    containers=[DMSInputContainer("MyContainer", constraint="cdf_cdm:CogniteDescribable")],
+                ),
+                set(),
+                {ContainerEntity(space="cdf_cdm", externalId="CogniteDescribable")},
+                id="Container requiring other container",
+            )
+        ],
+    )
+    def test_imported_views_and_containers_ids(
+        self, input_rules: DMSInputRules, expected_views: set[ViewEntity], expected_containers: set[ContainerEntity]
+    ) -> None:
+        validation = DMSValidation(input_rules.as_verified_rules())
+        actual_views, actual_containers = validation.imported_views_and_containers_ids()
+
+        assert actual_views == expected_views
+        assert actual_containers == expected_containers