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

48 lines
1.8 KiB
Python

from django.contrib.postgres.aggregates import StringAgg
from django.contrib.postgres.search import (
SearchQuery, SearchRank, SearchVector, TrigramSimilarity,
)
from django.db import models
from django.utils import translation
DICTIONARY = {
# TODO find custom dictionaries - maybe from here https://www.postgresql.org/message-id/CAF4Au4x6X_wSXFwsQYE8q5o0aQZANrvYjZJ8uOnsiHDnOVPPEg%40mail.gmail.com
# 'hy': 'Armenian',
# 'ca': 'Catalan',
# 'cs': 'Czech',
'nl': 'dutch',
'en': 'english',
'fr': 'french',
'de': 'german',
'it': 'italian',
# 'lv': 'Latvian',
'es': 'spanish',
}
# TODO add search highlighting
# TODO add language support
# TODO add schedule index rebuild
class RecipeSearchManager(models.Manager):
def search(self, search_text, space):
language = DICTIONARY.get(translation.get_language(), 'simple')
search_query = SearchQuery(
search_text, config=language
)
search_vectors = (
SearchVector('search_vector')
+ SearchVector(StringAgg('steps__ingredients__food__name', delimiter=' '), weight='B', config=language)
+ SearchVector(StringAgg('keywords__name', delimiter=' '), weight='B', config=language))
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'))