working proof of concept

cookbook/managers.py

@@ -0,0 +1,30 @@
+from django.contrib.postgres.aggregates import StringAgg
+from django.contrib.postgres.search import (
+    SearchQuery, SearchRank, SearchVector, TrigramSimilarity,
+)
+from django.db import models
+
+
+# TODO add search highlighting
+# TODO add language support
+# TODO add schedule index rebuild
+# TODO add admin function to rebuild index
+class RecipeSearchManager(models.Manager):
+
+    def search(self, search_text, space):
+        search_query = SearchQuery(
+            search_text, config='english'
+        )
+        search_vectors = (
+            SearchVector('search_vector')
+            + SearchVector(StringAgg('steps__ingredients__food__name', delimiter=' '), weight='A', config='english')
+            + SearchVector(StringAgg('keywords__name', delimiter=' '), weight='A', config='english'))
+        search_rank = SearchRank(search_vectors, search_query)
+        # trigram_similarity = TrigramSimilarity(
+        #     'headline', search_text
+        # )
+        return (
+            self.get_queryset()
+            .annotate(search=search_vectors, rank=search_rank)
+            .filter(search=search_query)
+            .order_by('-rank'))