Fix: use explicit order field for workflow actions (#11781)

src/documents/migrations/1076_workflowaction_order.py

@@ -0,0 +1,28 @@
+# Generated by Django 5.2.7 on 2026-01-14 16:53
+
+from django.db import migrations
+from django.db import models
+from django.db.models import F
+
+
+def populate_action_order(apps, schema_editor):
+    WorkflowAction = apps.get_model("documents", "WorkflowAction")
+    WorkflowAction.objects.all().update(order=F("id"))
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("documents", "1075_alter_paperlesstask_task_name"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="workflowaction",
+            name="order",
+            field=models.PositiveIntegerField(default=0, verbose_name="order"),
+        ),
+        migrations.RunPython(
+            populate_action_order,
+            reverse_code=migrations.RunPython.noop,
+        ),
+    ]

src/documents/models.py

@@ -1295,6 +1295,8 @@ class WorkflowAction(models.Model):
         default=WorkflowActionType.ASSIGNMENT,
     )
 
+    order = models.PositiveIntegerField(_("order"), default=0)
+
     assign_title = models.TextField(
         _("assign title"),
         null=True,

src/documents/serialisers.py

@@ -2577,7 +2577,8 @@ class WorkflowSerializer(serializers.ModelSerializer):
                 set_triggers.append(trigger_instance)
 
         if actions is not None and actions is not serializers.empty:
-            for action in actions:
+            for index, action in enumerate(actions):
+                action["order"] = index
                 assign_tags = action.pop("assign_tags", None)
                 assign_view_users = action.pop("assign_view_users", None)
                 assign_view_groups = action.pop("assign_view_groups", None)
@@ -2704,6 +2705,16 @@ class WorkflowSerializer(serializers.ModelSerializer):
 
         return instance
 
+    def to_representation(self, instance):
+        data = super().to_representation(instance)
+        actions = instance.actions.order_by("order", "pk")
+        data["actions"] = WorkflowActionSerializer(
+            actions,
+            many=True,
+            context=self.context,
+        ).data
+        return data
+
 
 class TrashSerializer(SerializerWithPerms):
     documents = serializers.ListField(

src/documents/signals/handlers.py

@@ -781,7 +781,7 @@ def run_workflows(
 
         if matching.document_matches_workflow(document, workflow, trigger_type):
             action: WorkflowAction
-            for action in workflow.actions.all():
+            for action in workflow.actions.order_by("order", "pk"):
                 message = f"Applying {action} from {workflow}"
                 if not use_overrides:
                     logger.info(message, extra={"group": logging_group})

src/documents/workflows/utils.py

@@ -20,9 +20,6 @@ def get_workflows_for_trigger(
     wrap it in a list; otherwise fetch enabled workflows for the trigger with
     the prefetches used by the runner.
     """
-    if workflow_to_run is not None:
-        return [workflow_to_run]
-
     annotated_actions = (
         WorkflowAction.objects.select_related(
             "assign_correspondent",
@@ -105,10 +102,25 @@ def get_workflows_for_trigger(
         )
     )
 
+    action_prefetch = Prefetch(
+        "actions",
+        queryset=annotated_actions.order_by("order", "pk"),
+    )
+
+    if workflow_to_run is not None:
+        return (
+            Workflow.objects.filter(pk=workflow_to_run.pk)
+            .prefetch_related(
+                action_prefetch,
+                "triggers",
+            )
+            .distinct()
+        )
+
     return (
         Workflow.objects.filter(enabled=True, triggers__type=trigger_type)
         .prefetch_related(
-            Prefetch("actions", queryset=annotated_actions),
+            action_prefetch,
             "triggers",
         )
         .order_by("order")