Provide linkage from spawned job back to wfj.

awx/api/serializers.py

@@ -566,7 +566,7 @@ class UnifiedJobSerializer(BaseSerializer):
         fields = ('*', 'unified_job_template', 'launch_type', 'status',
                   'failed', 'started', 'finished', 'elapsed', 'job_args',
                   'job_cwd', 'job_env', 'job_explanation', 'result_stdout',
-                  'execution_node', 'result_traceback')
+                  'execution_node', 'result_traceback', 'source_workflow_job')
         extra_kwargs = {
             'unified_job_template': {
                 'source': 'unified_job_template_id',

awx/main/migrations/0053_v310_linkage_back_to_workflow_job.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('main', '0052_v310_inventory_name_non_unique'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='unifiedjob',
+            name='source_workflow_job',
+            field=models.ForeignKey(related_name='spawned_jobs', on_delete=django.db.models.deletion.SET_NULL, default=None, editable=False, to='main.WorkflowJob', null=True),
+        ),
+    ]

awx/main/models/unified_jobs.py

@@ -528,7 +528,14 @@ class UnifiedJob(PolymorphicModel, PasswordFieldsModel, CommonModelNameNotUnique
         blank=True,
         related_name='%(class)s_labels'
     )
-
+    source_workflow_job = models.ForeignKey(
+        'WorkflowJob',
+        null=True,
+        default=None,
+        editable=False,
+        related_name='spawned_jobs',
+        on_delete=models.SET_NULL,
+    )
 
     def get_absolute_url(self):
         real_instance = self.get_real_instance()

awx/main/scheduler/__init__.py

@@ -116,6 +116,11 @@ class TaskManager():
             for spawn_node in spawn_nodes:
                 kv = spawn_node.get_job_kwargs()
                 job = spawn_node.unified_job_template.create_unified_job(**kv)
+                # source_workflow_job is a job-specific field rather than a field copied from job
+                # template, therefore does not fit into the copy routine and should be put outside
+                # of create_unified_job.
+                job.source_workflow_job = workflow_job
+                job.save()
                 spawn_node.job = job
                 spawn_node.save()
                 can_start = job.signal_start(**kv)