add dataset count to collaborative document

Author: Deepthi-Chand

search/documents/collaborative_document.py

@@ -152,6 +152,7 @@ class CollaborativeDocument(Document):
     platform_url = fields.TextField(analyzer=ngram_analyser)
     started_on = fields.DateField()
     completed_on = fields.DateField()
+    dataset_count = fields.IntegerField()
 
     def prepare_metadata(self, instance: Collaborative) -> List[Dict[str, Any]]:
         processed_metadata: List[Dict[str, Any]] = []
@@ -255,6 +256,9 @@ def prepare_cover_image(self, instance: Collaborative) -> str:
             return str(instance.cover_image.path.replace("/code/files/", ""))
         return ""
 
+    def prepare_dataset_count(self, instance: Collaborative) -> int:
+        return instance.datasets.count()
+
     def should_index_object(self, obj: Collaborative) -> bool:
         return obj.status == CollaborativeStatus.PUBLISHED