Class Book

tests/postgres_tests/test_constraints.py:366–385

                app_label = "postgres_tests"

        class Book(Model):
            title = CharField(max_length=255)
            published_date = DateField()
            author = ForeignKey(Author, CASCADE)

            class Meta:
                app_label = "postgres_tests"
                constraints = [
                    ExclusionConstraint(
                        name="exclude_check",
                        expressions=[
                            (F("title"), RangeOperators.EQUAL),
                            (F("published_date__year"), RangeOperators.EQUAL),
                            ("published_date__month", RangeOperators.EQUAL),
                            (F("author__name"), RangeOperators.EQUAL),
                            ("author__alias", RangeOperators.EQUAL),
                            ("nonexistent", RangeOperators.EQUAL),
                        ],
                    )
                ]

        self.assertCountEqual(
            Book.check(databases=self.databases),