Allow DataForms to persist MainConfig object (#194)

* updated configs to actual pydantic v2

* updated ultrack API pydantic models

* fixed docs

* Allow  to persist  object

* Allow DataForms to persist MainConfig object

* moved alias mapping to config file

---------

Co-authored-by: Jordao Bragantini <[email protected]>

Author: ilan-theodoro

Diff for: ultrack/config/config.py

@@ -12,6 +12,14 @@
 LOG = logging.getLogger(__name__)
 
 
+CFG_ALIAS_TO_ATTR = {
+    "segmentation": "segmentation_config",
+    "linking": "linking_config",
+    "tracking": "tracking_config",
+    "data": "data_config",
+}
+
+
 class LinkingConfig(BaseModel):
     """
     Candidate cell hypotheses linking configuration

Diff for: ultrack/widgets/ultrackwidget/data_forms.py

@@ -13,7 +13,7 @@
     QWidget,
 )
 
-from ultrack import MainConfig
+from ultrack.config import CFG_ALIAS_TO_ATTR, MainConfig
 from ultrack.widgets.ultrackwidget.components.blankable_number_edit import (
     BlankableNumberEdit,
 )
@@ -114,9 +114,12 @@ def load_config(self, config: MainConfig) -> None:
         config : MainConfig
             The main configuration to load.
         """
-        self._config = config.model_dump(by_alias=True)
-        for id_form, id_field, widget, getter, setter in self._bindings:
-            value = self._config[id_form][id_field]
+        self._config = config
+        for id_form, id_field, widget, _, setter in self._bindings:
+            # Get the actual config field name from the alias mapping
+            field_name = CFG_ALIAS_TO_ATTR.get(id_form, id_form)
+            # In Pydantic v2, we can still use getattr for nested access
+            value = getattr(getattr(self._config, field_name), id_field)
             getattr(widget, setter)(value)
 
     def _create_form(self, id_form: str, metadata: Dict[str, Any]) -> None:
@@ -372,10 +375,14 @@ def get_config(self) -> MainConfig:
         MainConfig
             The main configuration object.
         """
-        for id_form, id_field, widget, getter, setter in self._bindings:
+        for id_form, id_field, widget, getter, _ in self._bindings:
             value = getattr(widget, getter)()
-            self._config[id_form][id_field] = value
-        return MainConfig.parse_obj(self._config)
+            # Get the actual config field name from the alias mapping
+            field_name = CFG_ALIAS_TO_ATTR.get(id_form, id_form)
+            sub_config = getattr(self._config, field_name)
+            # In Pydantic v2, we can still use setattr for direct updates
+            setattr(sub_config, id_field, value)
+        return self._config
 
     def setup_additional_options(self, workflow_choice: WorkflowChoice) -> None:
         """