add /matches endpoint ad return match information in tickets and /item endpoints

core/inventory/models.py

@@ -1,5 +1,6 @@
-from django.core.files.base import ContentFile
-from django.db import models, IntegrityError
+from itertools import groupby
+
+from django.db import models
 from django_softdelete.models import SoftDeleteModel, SoftDeleteManager
 
 
@@ -26,6 +27,13 @@ class Item(SoftDeleteModel):
     created_at = models.DateTimeField(null=True, auto_now_add=True)
     updated_at = models.DateTimeField(blank=True, null=True)
 
+    @property
+    def related_issues(self):
+        groups = groupby(self.issue_relation_changes.all(), lambda rel: rel.issue_thread.id)
+        return [sorted(v, key=lambda r: r.timestamp)[0].issue_thread for k, v in groups]
+
+
+
     objects = ItemManager()
     all_objects = models.Manager()