round result of similarity because postgresql uses greater precision round result of distance because postgresql uses greater precision textfield has the same behavior as charfield regarding trigram lookups round result of similarity because postgresql uses greater precision round result of distance because postgresql uses greater precision textfield has the same behavior as charfield regarding trigram lookups
from . import PostgreSQLTestCase
from .models import CharFieldModel, TextFieldModel

try:
    from django.contrib.postgres.search import (
        TrigramDistance,
        TrigramSimilarity,
        TrigramStrictWordDistance,
        TrigramStrictWordSimilarity,
        TrigramWordDistance,
        TrigramWordSimilarity,
    )
except ImportError:
    pass


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],
        )
        self.assertSequenceEqual(
            self.Model.objects.filter(field__trigram_word_similar="Middle"),
            [obj],
        )

    def test_trigram_strict_word_search_matched(self):
        obj = self.Model.objects.create(
            field="Gumby rides on the path of Middlesbrough",
        )
        self.assertSequenceEqual(
            self.Model.objects.filter(
                field__trigram_strict_word_similar="Middlesborough"
            ),
            [obj],
        )
        self.assertSequenceEqual(
            self.Model.objects.filter(field__trigram_strict_word_similar="Middle"),
            [],
        )

    def test_trigram_similarity(self):
        search = "Bat sat on cat."
        
        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_strict_word_similarity(self):
        search = "matt"
        self.assertSequenceEqual(
            self.Model.objects.filter(field__trigram_word_similar=search)
            .annotate(word_similarity=TrigramStrictWordSimilarity(search, "field"))
            .values("field", "word_similarity")
            .order_by("-word_similarity"),
            [
                {"field": "Cat sat on mat.", "word_similarity": 0.5},
                {"field": "Matthew", "word_similarity": 0.44444445},
            ],
        )

    def test_trigram_similarity_alternate(self):
        
        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},
            ],
        )

    def test_trigram_strict_word_distance(self):
        self.assertSequenceEqual(
            self.Model.objects.annotate(
                word_distance=TrigramStrictWordDistance("matt", "field"),
            )
            .filter(word_distance__lte=0.7)
            .values("field", "word_distance")
            .order_by("word_distance"),
            [
                {"field": "Cat sat on mat.", "word_distance": 0.5},
                {"field": "Matthew", "word_distance": 0.5555556},
            ],
        )


class TrigramTextFieldTest(TrigramTest):
    

    Model = TextFieldModel