product search with ranking is working

products/utils.py

@@ -114,25 +114,21 @@ def find_related_products_v3(keyword):
     SearchVectors for the fields
     SearchQuery for the value
     SearchRank for relevancy scoring and ranking
-
-    PROBLEM: returns unrelated instances
     """
-    # TODO: figure out why it includes unrelated instances
-    # fields=('name', 'description', 'tags__label', 'attributes__label', 'category__name')
-
     vector = SearchVector('name') + SearchVector('description') + SearchVector('tags__label') + SearchVector('attributes__label') + SearchVector('category__name')
     query = SearchQuery(keyword)
 
     products_qs = Product.objects.annotate(
         rank=SearchRank(vector, query)
-    ).filter(rank__gt=0.05).order_by('-rank')
+    ).filter(rank__gt=0.05)     # removed order_by because its lost in casting
 
     return set(products_qs)
 
 
 def find_related_products_v4(keyword):
     """
-    Using trigrams
+    Similarity-ranked search using trigrams
+    Not working
     """
     # fields=('name', 'description', 'tags__label', 'attributes__label', 'category__name')