[ENG-9122]Update create_at field for versioned preprint (#11383)

Author: Vlad0n20

osf/models/preprint.py

@@ -794,6 +794,22 @@ def csl(self):  # formats node information into CSL format for citation parsing
     def is_latest_version(self):
         return self.guids.exists()
 
+    @property
+    def date_created_first_version(self):
+        try:
+            base_guid = self.versioned_guids.first().guid if self.versioned_guids.exists() else None
+            if not base_guid:
+                return self.created
+
+            first_version = base_guid.versions.filter(is_rejected=False).order_by('version').first()
+
+            if first_version and first_version.referent:
+                return first_version.referent.created
+
+            return self.created
+        except Exception:
+            return self.created
+
     def get_preprint_versions(self, include_rejected=True, **version_filters):
         guids = self.versioned_guids.first().guid.versions.all()
         preprint_versions = (

website/search/elastic_search.py

@@ -436,7 +436,7 @@ def serialize_preprint(preprint, category):
         'tags': list(preprint.tags.filter(system=False).values_list('name', flat=True)),
         'description': preprint.description,
         'url': preprint.url,
-        'date_created': preprint.created,
+        'date_created': preprint.date_created_first_version,
         'license': serialize_node_license_record(preprint.license),
         'boost': 2,  # More relevant than a registration
         'extra_search_terms': clean_splitters(preprint.title),