TandoorRecipes/cookbook/managers.py
2021-07-29 16:38:24 -05:00

34 lines
1.4 KiB
Python

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='B', config='english')
+ SearchVector(StringAgg('keywords__name', delimiter=' '), weight='B', config='english'))
search_rank = SearchRank(search_vectors, search_query)
# the results from trigram were really, really bad
# trigram = (
# TrigramSimilarity('name', search_text)
# + TrigramSimilarity('description', search_text)
# + TrigramSimilarity('steps__ingredients__food__name', search_text)
# + TrigramSimilarity('keywords__name', search_text))
return (
self.get_queryset()
.annotate(search=search_vectors, rank=search_rank)
.filter(search=search_query)
.order_by('-rank'))