Fix hook for rebuilding template parameters

src/backend/InvenTree/common/filters.py

@@ -210,7 +210,7 @@ def filter_parametric_data(queryset: QuerySet, parameters: dict[str, str]) -> Qu
     - parameter_<x>_lte=<value>
 
     where:
-        - <x> is the ID of the PartParameterTemplate.
+        - <x> is the ID of the ParameterTemplate.
         - <value> is the value to filter against.
 
     Typically these filters would be provided against via an API request.
@@ -257,7 +257,7 @@ def order_by_parameter(
     - -parameter_<x>
 
     where:
-        - <x> is the ID of the PartParameterTemplate.
+        - <x> is the ID of the ParameterTemplate.
         - A leading '-' indicates descending order.
     """
     import common.models

src/backend/InvenTree/common/models.py

@@ -2531,6 +2531,24 @@ class ParameterTemplate(
     )
 
 
+@receiver(
+    post_save, sender=ParameterTemplate, dispatch_uid='post_save_parameter_template'
+)
+def post_save_parameter_template(sender, instance, created, **kwargs):
+    """Callback function when a ParameterTemplate is created or saved."""
+    import common.tasks
+
+    if InvenTree.ready.canAppAccessDatabase() and not InvenTree.ready.isImportingData():
+        if not created:
+            # Schedule a background task to rebuild the parameters against this template
+            InvenTree.tasks.offload_task(
+                common.tasks.rebuild_parameters,
+                instance.pk,
+                force_async=True,
+                group='part',
+            )
+
+
 class Parameter(
     UpdatedUserMixin, InvenTree.models.MetadataMixin, InvenTree.models.InvenTreeModel
 ):

src/backend/InvenTree/common/tasks.py

@@ -172,3 +172,35 @@ def delete_old_notes_images():
         if not found:
             logger.info('Deleting note %s - image file not linked to a note', image)
             os.remove(os.path.join(notes_dir, image))
+
+
+@tracer.start_as_current_span('rebuild_parameters')
+def rebuild_parameters(template_id):
+    """Rebuild all parameters for a given template.
+
+    This function is called when a base template is changed,
+    which may cause the base unit to be adjusted.
+    """
+    from common.models import Parameter, ParameterTemplate
+
+    try:
+        template = ParameterTemplate.objects.get(pk=template_id)
+    except ParameterTemplate.DoesNotExist:
+        return
+
+    parameters = Parameter.objects.filter(template=template)
+
+    n = 0
+
+    for parameter in parameters:
+        # Update the parameter if the numeric value has changed
+        value_old = parameter.data_numeric
+        parameter.calculate_numeric_value()
+
+        if value_old != parameter.data_numeric:
+            parameter.full_clean()
+            parameter.save()
+            n += 1
+
+    if n > 0:
+        logger.info("Rebuilt %s parameters for template '%s'", n, template.name)

src/backend/InvenTree/part/tasks.py

@@ -355,38 +355,6 @@ def scheduled_stocktake_reports():
     record_task_success('STOCKTAKE_RECENT_REPORT')
 
 
-@tracer.start_as_current_span('rebuild_parameters')
-def rebuild_parameters(template_id):
-    """Rebuild all parameters for a given template.
-
-    This function is called when a base template is changed,
-    which may cause the base unit to be adjusted.
-    """
-    from part.models import PartParameter, PartParameterTemplate
-
-    try:
-        template = PartParameterTemplate.objects.get(pk=template_id)
-    except PartParameterTemplate.DoesNotExist:
-        return
-
-    parameters = PartParameter.objects.filter(template=template)
-
-    n = 0
-
-    for parameter in parameters:
-        # Update the parameter if the numeric value has changed
-        value_old = parameter.data_numeric
-        parameter.calculate_numeric_value()
-
-        if value_old != parameter.data_numeric:
-            parameter.full_clean()
-            parameter.save()
-            n += 1
-
-    if n > 0:
-        logger.info("Rebuilt %s parameters for template '%s'", n, template.name)
-
-
 @tracer.start_as_current_span('rebuild_supplier_parts')
 def rebuild_supplier_parts(part_id: int):
     """Rebuild all SupplierPart objects for a given part.