refactor Volume class to use dataclass and dataclass_json

Replaces the manual __init__/property/create_from_dict pattern with
@DataClass + @dataclass_json for consistency with the Instance class.
Undefined.EXCLUDE silently drops unknown API fields; infer_missing
defaults missing optional fields to None. Retains create_from_dict as
a deprecated shim for backwards compatibility.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: tamirse

CHANGELOG.md

@@ -11,6 +11,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Added missing fields to the `Volume` class: `pseudo_path`, `mount_command`, `create_directory_command`, `filesystem_to_fstab_command`, `instances`, `contract`, `base_hourly_cost`, `monthly_price`, `currency`, `long_term`
 
+### Changed
+
+- Refactored `Volume` class to use `@dataclass` and `@dataclass_json` for consistency with `Instance` class. `Volume.create_from_dict()` is replaced by `Volume.from_dict()`; unknown API fields are now silently ignored via `Undefined.EXCLUDE`
+
 ## [1.23.1] - 2026-03-25
 
 ### Fixed

tests/unit_tests/volumes/test_volumes.py

@@ -49,7 +49,7 @@
     'is_os_volume': True,
     'created_at': NVME_VOL_CREATED_AT,
     'target': TARGET_VDA,
-    'ssh_key_ids': SSH_KEY_ID,
+    'ssh_key_ids': [SSH_KEY_ID],
     'pseudo_path': 'volume-nxC2tf9F',
     'mount_command': 'mount -t nfs -o nconnect=16 nfs.fin-01.datacrunch.io:volume-nxC2tf9F /mnt/volume',
     'create_directory_command': 'mkdir -p /mnt/volume',
@@ -108,13 +108,13 @@ def endpoint(self, http_client):
 
     def test_initialize_a_volume(self):
         volume = Volume(
-            RANDOM_VOL_ID,
-            VolumeStatus.DETACHED,
-            HDD_VOL_NAME,
-            HDD_VOL_SIZE,
-            HDD,
-            False,
-            HDD_VOL_CREATED_AT,
+            id=RANDOM_VOL_ID,
+            status=VolumeStatus.DETACHED,
+            name=HDD_VOL_NAME,
+            size=HDD_VOL_SIZE,
+            type=HDD,
+            is_os_volume=False,
+            created_at=HDD_VOL_CREATED_AT,
         )
 
         assert volume.id == RANDOM_VOL_ID
@@ -129,8 +129,8 @@ def test_initialize_a_volume(self):
         assert volume.target is None
         assert volume.ssh_key_ids == []
 
-    def test_create_from_dict_without_new_fields(self):
-        """Test that create_from_dict handles API responses missing the new fields."""
+    def test_from_dict_without_optional_fields(self):
+        """Test that from_dict handles API responses missing optional fields."""
         minimal_dict = {
             'id': RANDOM_VOL_ID,
             'status': VolumeStatus.DETACHED,
@@ -144,7 +144,7 @@ def test_create_from_dict_without_new_fields(self):
             'instance_id': None,
             'ssh_key_ids': [],
         }
-        volume = Volume.create_from_dict(minimal_dict)
+        volume = Volume.from_dict(minimal_dict, infer_missing=True)
         assert volume.id == RANDOM_VOL_ID
         assert volume.pseudo_path is None
         assert volume.mount_command is None
@@ -181,7 +181,7 @@ def test_get_volumes(self, volumes_service, endpoint):
         assert volume_nvme.is_os_volume
         assert volume_nvme.created_at == NVME_VOL_CREATED_AT
         assert volume_nvme.target == TARGET_VDA
-        assert volume_nvme.ssh_key_ids == SSH_KEY_ID
+        assert volume_nvme.ssh_key_ids == [SSH_KEY_ID]
         assert volume_nvme.pseudo_path == NVME_VOLUME['pseudo_path']
         assert volume_nvme.mount_command == NVME_VOLUME['mount_command']
         assert volume_nvme.create_directory_command == NVME_VOLUME['create_directory_command']