Store active plan's id to a ProjectVariable.

Store plan's id to a ProjectVariable when creating new plan or opening existing plan.
Clear active_plan_id in clear_all_filters()

Author: Mtk112

arho_feature_template/core/plan_manager.py

@@ -1,4 +1,4 @@
-from qgis.core import QgsProject, QgsVectorLayer
+from qgis.core import QgsExpressionContextUtils, QgsProject, QgsVectorLayer
 from qgis.PyQt.QtWidgets import QDialog, QMessageBox
 from qgis.utils import iface
 
@@ -95,7 +95,8 @@ def load_land_use_plan(self):
             update_selected_plan(plan)
 
     def clear_all_filters(self):
-        """Clear filters for all vector layers in the project."""
+        """Clear active_plan_id and filters for all vector layers in the project."""
+        QgsExpressionContextUtils.setProjectVariable(QgsProject.instance(), "active_plan_id", None)
         for layer in QgsProject.instance().mapLayers().values():
             if isinstance(layer, QgsVectorLayer):
                 layer.setSubsetString("")

arho_feature_template/core/update_plan.py

@@ -1,6 +1,6 @@
 from dataclasses import dataclass
 
-from qgis.core import QgsMapLayer, QgsProject, QgsVectorLayer
+from qgis.core import QgsExpressionContextUtils, QgsMapLayer, QgsProject, QgsVectorLayer
 from qgis.utils import iface
 
 
@@ -24,6 +24,7 @@ class LandUsePlan:
 def update_selected_plan(new_plan: LandUsePlan):
     """Update the project layers based on the selected land use plan."""
     plan_id = new_plan.id
+    QgsExpressionContextUtils.setProjectVariable(QgsProject.instance(), "active_plan_id", plan_id)
 
     for layer_name, field_name in LAYER_PLAN_ID_MAP.items():
         # Set the filter on each layer using the plan_id

arho_feature_template/utils/misc_utils.py

@@ -1,6 +1,6 @@
 import os
 
-from qgis.core import QgsProject, QgsVectorLayer
+from qgis.core import QgsExpressionContextUtils, QgsProject, QgsVectorLayer
 from qgis.PyQt.QtCore import QSettings
 from qgis.PyQt.QtWidgets import QMessageBox
 
@@ -58,6 +58,12 @@ def handle_unsaved_changes() -> bool:
     return True
 
 
+def get_active_plan_id():
+    """Retrieve the active plan ID stored as a project variable."""
+    # return QgsExpressionContextUtils.projectScope(QgsProject.instance(), "active_plan_id")
+    return QgsExpressionContextUtils.projectScope(QgsProject.instance()).variable("active_plan_id")
+
+
 def get_lambda_settings():
     """Retrieve Lambda settings, using defaults if not set."""
     settings = QSettings("ArhoFeatureTemplate")