refactor(BA-6003): route CLI _build_dto through model_validate

The seven ``_build_dto`` helpers in ``client/cli/v2/admin/*`` and
``client/cli/v2/model_card/commands.py`` used to invoke the DTO via
its constructor (``dto_cls(**data)``) and catch the raw pydantic
``ValidationError``. Switch them to ``dto_cls.model_validate(data)``
so the call flows through ``BackendAIModel``'s override path, and
catch the resulting ``BackendAIModelValidationFailed`` instead. The
per-field rendering uses ``extra_data["errors"]`` (same shape as
``pydantic.ValidationError.errors()``).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: jopemachine

src/ai/backend/client/cli/v2/admin/deployment_revision_preset.py

@@ -19,13 +19,13 @@
 
 
 def _build_dto(dto_cls: type, data: dict[str, Any]) -> Any:
-    from pydantic import ValidationError
+    from ai.backend.common.exception import BackendAIModelValidationFailed
 
     try:
-        return dto_cls(**data)
-    except ValidationError as e:
+        return dto_cls.model_validate(data)
+    except BackendAIModelValidationFailed as e:
         click.echo("Validation error:", err=True)
-        for err in e.errors():
+        for err in (e.extra_data or {}).get("errors", []):
             field = ".".join(str(loc) for loc in err["loc"])
             click.echo(f"  {field}: {err['msg']}", err=True)
         sys.exit(1)

src/ai/backend/client/cli/v2/admin/model_card.py

@@ -19,13 +19,13 @@
 
 
 def _build_dto(dto_cls: type, data: dict[str, Any]) -> Any:
-    from pydantic import ValidationError
+    from ai.backend.common.exception import BackendAIModelValidationFailed
 
     try:
-        return dto_cls(**data)
-    except ValidationError as e:
+        return dto_cls.model_validate(data)
+    except BackendAIModelValidationFailed as e:
         click.echo("Validation error:", err=True)
-        for err in e.errors():
+        for err in (e.extra_data or {}).get("errors", []):
             field = ".".join(str(loc) for loc in err["loc"])
             click.echo(f"  {field}: {err['msg']}", err=True)
         sys.exit(1)

src/ai/backend/client/cli/v2/admin/resource_policy.py

@@ -48,13 +48,13 @@ def _load_input(
 
 def _build_dto(dto_cls: type, data: dict[str, Any]) -> Any:
     """Build a Pydantic DTO from a dict, catching validation errors."""
-    from pydantic import ValidationError
+    from ai.backend.common.exception import BackendAIModelValidationFailed
 
     try:
-        return dto_cls(**data)
-    except ValidationError as e:
+        return dto_cls.model_validate(data)
+    except BackendAIModelValidationFailed as e:
         click.echo("Validation error:", err=True)
-        for err in e.errors():
+        for err in (e.extra_data or {}).get("errors", []):
             field = ".".join(str(loc) for loc in err["loc"])
             click.echo(f"  {field}: {err['msg']}", err=True)
         sys.exit(1)

src/ai/backend/client/cli/v2/admin/resource_preset.py

@@ -20,13 +20,13 @@
 
 def _build_dto(dto_cls: type, data: dict[str, Any]) -> Any:
     """Build a Pydantic DTO from a dict, catching validation errors."""
-    from pydantic import ValidationError
+    from ai.backend.common.exception import BackendAIModelValidationFailed
 
     try:
-        return dto_cls(**data)
-    except ValidationError as e:
+        return dto_cls.model_validate(data)
+    except BackendAIModelValidationFailed as e:
         click.echo("Validation error:", err=True)
-        for err in e.errors():
+        for err in (e.extra_data or {}).get("errors", []):
             field = ".".join(str(loc) for loc in err["loc"])
             click.echo(f"  {field}: {err['msg']}", err=True)
         sys.exit(1)

src/ai/backend/client/cli/v2/admin/runtime_variant.py

@@ -19,13 +19,13 @@
 
 
 def _build_dto(dto_cls: type, data: dict[str, Any]) -> Any:
-    from pydantic import ValidationError
+    from ai.backend.common.exception import BackendAIModelValidationFailed
 
     try:
-        return dto_cls(**data)
-    except ValidationError as e:
+        return dto_cls.model_validate(data)
+    except BackendAIModelValidationFailed as e:
         click.echo("Validation error:", err=True)
-        for err in e.errors():
+        for err in (e.extra_data or {}).get("errors", []):
             field = ".".join(str(loc) for loc in err["loc"])
             click.echo(f"  {field}: {err['msg']}", err=True)
         sys.exit(1)

src/ai/backend/client/cli/v2/admin/runtime_variant_preset.py

@@ -19,13 +19,13 @@
 
 
 def _build_dto(dto_cls: type, data: dict[str, Any]) -> Any:
-    from pydantic import ValidationError
+    from ai.backend.common.exception import BackendAIModelValidationFailed
 
     try:
-        return dto_cls(**data)
-    except ValidationError as e:
+        return dto_cls.model_validate(data)
+    except BackendAIModelValidationFailed as e:
         click.echo("Validation error:", err=True)
-        for err in e.errors():
+        for err in (e.extra_data or {}).get("errors", []):
             field = ".".join(str(loc) for loc in err["loc"])
             click.echo(f"  {field}: {err['msg']}", err=True)
         sys.exit(1)

src/ai/backend/client/cli/v2/model_card/commands.py

@@ -19,13 +19,13 @@
 
 
 def _build_dto(dto_cls: type, data: dict[str, Any]) -> Any:
-    from pydantic import ValidationError
+    from ai.backend.common.exception import BackendAIModelValidationFailed
 
     try:
-        return dto_cls(**data)
-    except ValidationError as e:
+        return dto_cls.model_validate(data)
+    except BackendAIModelValidationFailed as e:
         click.echo("Validation error:", err=True)
-        for err in e.errors():
+        for err in (e.extra_data or {}).get("errors", []):
             field = ".".join(str(loc) for loc in err["loc"])
             click.echo(f"  {field}: {err['msg']}", err=True)
         sys.exit(1)