Move function flatten_general_templates to DeviceTemplate model. (#526)

* Move function flatten_general_templates to DeviceTemplate model.

* Rename

catalystwan/api/templates/device_template/device_template.py

@@ -50,6 +50,26 @@ class DeviceTemplate(BaseModel):
     security_policy_id: str = Field(default="", alias="securityPolicyId")
     policy_id: str = Field(default="", alias="policyId")
 
+    def get_flattened_general_templates(self) -> List[GeneralTemplate]:
+        """
+        Recursively flattens the general templates by removing the sub-templates
+        and returning a list of flattened templates.
+
+        Returns:
+            A list of GeneralTemplate objects representing the flattened templates.
+        """
+
+        def flatten_general_templates(general_templates: List[GeneralTemplate]) -> List[GeneralTemplate]:
+            result = []
+            for gt in general_templates:
+                sub_templates = gt.subTemplates
+                gt.subTemplates = []
+                result.append(gt)
+                result.extend(flatten_general_templates(sub_templates))
+            return result
+
+        return flatten_general_templates(self.general_templates)
+
     def generate_payload(self) -> str:
         env = Environment(
             loader=FileSystemLoader(self.payload_path.parent),

catalystwan/tests/templates/test_device_template.py

@@ -0,0 +1,48 @@
+import unittest
+
+from catalystwan.api.templates.device_template.device_template import DeviceTemplate, GeneralTemplate
+
+
+class TestDeviceTemplate(unittest.TestCase):
+    def setUp(self):
+        self.device_template = DeviceTemplate(
+            template_name="DT-example",
+            template_description="DT-example",
+            device_role="None",
+            device_type="None",
+            security_policy_id="None",
+            policy_id="None",
+            generalTemplates=[
+                GeneralTemplate(
+                    name="1level",
+                    templateId="1",
+                    templateType="1",
+                    subTemplates=[
+                        GeneralTemplate(
+                            name="2level",
+                            templateId="2",
+                            templateType="2",
+                            subTemplates=[GeneralTemplate(name="3level", templateId="3", templateType="3")],
+                        )
+                    ],
+                )
+            ],
+        )
+
+    def test_flatten_general_templates(self):
+        self.assertEqual(
+            self.device_template.get_flattened_general_templates(),
+            [
+                GeneralTemplate(
+                    name="1level",
+                    templateId="1",
+                    templateType="1",
+                ),
+                GeneralTemplate(
+                    name="2level",
+                    templateId="2",
+                    templateType="2",
+                ),
+                GeneralTemplate(name="3level", templateId="3", templateType="3"),
+            ],
+        )