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from django.db.models import CharField
from django.db.models import Value as V
from django.db.models.functions import Coalesce, Length, Upper
from django.test import TestCase
from django.test.utils import register_lookup
from .models import Author
class UpperBilateral(Upper):
bilateral = True
class FunctionTests(TestCase):
def test_nested_function_ordering(self):
Author.objects.create(name="John Smith")
Author.objects.create(name="Rhonda Simpson", alias="ronny")
authors = Author.objects.order_by(Length(Coalesce("alias", "name")))
self.assertQuerySetEqual(
authors,
[
"Rhonda Simpson",
"John Smith",
],
lambda a: a.name,
)
authors = Author.objects.order_by(Length(Coalesce("alias", "name")).desc())
self.assertQuerySetEqual(
authors,
[
"John Smith",
"Rhonda Simpson",
],
lambda a: a.name,
)
def test_func_transform_bilateral(self):
with register_lookup(CharField, UpperBilateral):
Author.objects.create(name="John Smith", alias="smithj")
Author.objects.create(name="Rhonda")
authors = Author.objects.filter(name__upper__exact="john smith")
self.assertQuerySetEqual(
authors.order_by("name"),
[
"John Smith",
],
lambda a: a.name,
)
def test_func_transform_bilateral_multivalue(self):
with register_lookup(CharField, UpperBilateral):
Author.objects.create(name="John Smith", alias="smithj")
Author.objects.create(name="Rhonda")
authors = Author.objects.filter(name__upper__in=["john smith", "rhonda"])
self.assertQuerySetEqual(
authors.order_by("name"),
[
"John Smith",
"Rhonda",
],
lambda a: a.name,
)
def test_function_as_filter(self):
Author.objects.create(name="John Smith", alias="SMITHJ")
Author.objects.create(name="Rhonda")
self.assertQuerySetEqual(
Author.objects.filter(alias=Upper(V("smithj"))),
["John Smith"],
lambda x: x.name,
)
self.assertQuerySetEqual(
Author.objects.exclude(alias=Upper(V("smithj"))),
["Rhonda"],
lambda x: x.name,
)
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