58 lines
2.0 KiB
Python
58 lines
2.0 KiB
Python
from django.contrib.postgres.search import TrigramDistance, TrigramSimilarity
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from django.test import modify_settings
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from . import PostgreSQLTestCase
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from .models import CharFieldModel, TextFieldModel
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@modify_settings(INSTALLED_APPS={'append': 'django.contrib.postgres'})
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class TrigramTest(PostgreSQLTestCase):
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Model = CharFieldModel
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@classmethod
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def setUpTestData(cls):
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cls.Model.objects.bulk_create([
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cls.Model(field='Matthew'),
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cls.Model(field='Cat sat on mat.'),
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cls.Model(field='Dog sat on rug.'),
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])
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def test_trigram_search(self):
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self.assertQuerysetEqual(
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self.Model.objects.filter(field__trigram_similar='Mathew'),
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['Matthew'],
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transform=lambda instance: instance.field,
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)
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def test_trigram_similarity(self):
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search = 'Bat sat on cat.'
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# Round result of similarity because PostgreSQL 12+ uses greater
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# precision.
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self.assertQuerysetEqual(
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self.Model.objects.filter(
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field__trigram_similar=search,
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).annotate(similarity=TrigramSimilarity('field', search)).order_by('-similarity'),
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[('Cat sat on mat.', 0.625), ('Dog sat on rug.', 0.333333)],
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transform=lambda instance: (instance.field, round(instance.similarity, 6)),
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ordered=True,
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)
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def test_trigram_similarity_alternate(self):
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# Round result of distance because PostgreSQL 12+ uses greater
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# precision.
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self.assertQuerysetEqual(
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self.Model.objects.annotate(
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distance=TrigramDistance('field', 'Bat sat on cat.'),
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).filter(distance__lte=0.7).order_by('distance'),
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[('Cat sat on mat.', 0.375), ('Dog sat on rug.', 0.666667)],
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transform=lambda instance: (instance.field, round(instance.distance, 6)),
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ordered=True,
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)
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class TrigramTextFieldTest(TrigramTest):
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"""
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TextField has the same behavior as CharField regarding trigram lookups.
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"""
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Model = TextFieldModel
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