from django.test import modify_settings
from . import PostgreSQLTestCase
from .models import CharFieldModel, TextFieldModel
try:
from django.contrib.postgres.search import (
TrigramDistance,TrigramSimilarity,TrigramWordDistance,TrigramWordSimilarity,)except ImportError:
pass
@modify_settings(INSTALLED_APPS={"append": "django.contrib.postgres"})
class TrigramTest(PostgreSQLTestCase):
Model = CharFieldModel@classmethod
def setUpTestData(cls):
cls.Model.objects.bulk_create(
[cls.Model(field="Matthew"),
cls.Model(field="Cat sat on mat."),
cls.Model(field="Dog sat on rug."),
])def test_trigram_search(self):
self.assertQuerysetEqual(
self.Model.objects.filter(field__trigram_similar="Mathew"),
["Matthew"],
transform=lambda instance: instance.field,
)def test_trigram_word_search(self):
obj = self.Model.objects.create(
field="Gumby rides on the path of Middlesbrough",
)self.assertSequenceEqual(
self.Model.objects.filter(field__trigram_word_similar="Middlesborough"),
[obj],)def test_trigram_similarity(self):
search = "Bat sat on cat."
# Round result of similarity because PostgreSQL 12+ uses greater
# precision.
self.assertQuerysetEqual(
self.Model.objects.filter(
field__trigram_similar=search,
).annotate(similarity=TrigramSimilarity("field", search))
.order_by("-similarity"),
[("Cat sat on mat.", 0.625), ("Dog sat on rug.", 0.333333)],
transform=lambda instance: (instance.field, round(instance.similarity, 6)),
ordered=True,
)def test_trigram_word_similarity(self):
search = "mat"
self.assertSequenceEqual(
self.Model.objects.filter(
field__trigram_word_similar=search,
).annotate(
word_similarity=TrigramWordSimilarity(search, "field"),
).values("field", "word_similarity")
.order_by("-word_similarity"),
[{"field": "Cat sat on mat.", "word_similarity": 1.0},
{"field": "Matthew", "word_similarity": 0.75},
],)def test_trigram_similarity_alternate(self):
# Round result of distance because PostgreSQL 12+ uses greater
# precision.
self.assertQuerysetEqual(
self.Model.objects.annotate(
distance=TrigramDistance("field", "Bat sat on cat."),
).filter(distance__lte=0.7)
.order_by("distance"),
[("Cat sat on mat.", 0.375), ("Dog sat on rug.", 0.666667)],
transform=lambda instance: (instance.field, round(instance.distance, 6)),
ordered=True,
)def test_trigram_word_similarity_alternate(self):
self.assertSequenceEqual(
self.Model.objects.annotate(
word_distance=TrigramWordDistance("mat", "field"),
).filter(
word_distance__lte=0.7,
).values("field", "word_distance")
.order_by("word_distance"),
[{"field": "Cat sat on mat.", "word_distance": 0},
{"field": "Matthew", "word_distance": 0.25},
],)class TrigramTextFieldTest(TrigramTest):
"""
TextField has the same behavior as CharField regarding trigram lookups."""Model = TextFieldModel