import pickle from django import forms from django.core.exceptions import ValidationError from django.db import models from django.test import SimpleTestCase, TestCase from django.utils.functional import lazy from .models import ( Bar, Choiceful, Foo, RenamedField, VerboseNameField, Whiz, WhizDelayed, WhizIter, WhizIterEmpty, ) class Nested: class Field(models.Field): pass class BasicFieldTests(SimpleTestCase): def test_show_hidden_initial(self): """ Fields with choices respect show_hidden_initial as a kwarg to formfield(). """ choices = [(0, 0), (1, 1)] model_field = models.Field(choices=choices) form_field = model_field.formfield(show_hidden_initial=True) self.assertTrue(form_field.show_hidden_initial) form_field = model_field.formfield(show_hidden_initial=False) self.assertFalse(form_field.show_hidden_initial) def test_field_repr(self): """ __repr__() of a field displays its name. """ f = Foo._meta.get_field("a") self.assertEqual(repr(f), "") f = models.fields.CharField() self.assertEqual(repr(f), "") def test_field_repr_nested(self): """__repr__() uses __qualname__ for nested class support.""" self.assertEqual(repr(Nested.Field()), "") def test_field_name(self): """ A defined field name (name="fieldname") is used instead of the model model's attribute name (modelname). """ instance = RenamedField() self.assertTrue(hasattr(instance, "get_fieldname_display")) self.assertFalse(hasattr(instance, "get_modelname_display")) def test_field_verbose_name(self): m = VerboseNameField for i in range(1, 22): self.assertEqual( m._meta.get_field("field%d" % i).verbose_name, "verbose field%d" % i ) self.assertEqual(m._meta.get_field("id").verbose_name, "verbose pk") def test_choices_form_class(self): """Can supply a custom choices form class to Field.formfield()""" choices = [("a", "a")] field = models.CharField(choices=choices) klass = forms.TypedMultipleChoiceField self.assertIsInstance(field.formfield(choices_form_class=klass), klass) def test_formfield_disabled(self): """Field.formfield() sets disabled for fields with choices.""" field = models.CharField(choices=[("a", "b")]) form_field = field.formfield(disabled=True) self.assertIs(form_field.disabled, True) def test_field_str(self): f = models.Field() self.assertEqual(str(f), "") f = Foo._meta.get_field("a") self.assertEqual(str(f), "model_fields.Foo.a") def test_field_ordering(self): """Fields are ordered based on their creation.""" f1 = models.Field() f2 = models.Field(auto_created=True) f3 = models.Field() self.assertLess(f2, f1) self.assertGreater(f3, f1) self.assertIsNotNone(f1) self.assertNotIn(f2, (None, 1, "")) def test_field_instance_is_picklable(self): """Field instances can be pickled.""" field = models.Field(max_length=100, default="a string") # Must be picklable with this cached property populated (#28188). field._get_default pickle.dumps(field) def test_deconstruct_nested_field(self): """deconstruct() uses __qualname__ for nested class support.""" name, path, args, kwargs = Nested.Field().deconstruct() self.assertEqual(path, "model_fields.tests.Nested.Field") def test_abstract_inherited_fields(self): """Field instances from abstract models are not equal.""" class AbstractModel(models.Model): field = models.IntegerField() class Meta: abstract = True class InheritAbstractModel1(AbstractModel): pass class InheritAbstractModel2(AbstractModel): pass abstract_model_field = AbstractModel._meta.get_field("field") inherit1_model_field = InheritAbstractModel1._meta.get_field("field") inherit2_model_field = InheritAbstractModel2._meta.get_field("field") self.assertNotEqual(abstract_model_field, inherit1_model_field) self.assertNotEqual(abstract_model_field, inherit2_model_field) self.assertNotEqual(inherit1_model_field, inherit2_model_field) self.assertLess(abstract_model_field, inherit1_model_field) self.assertLess(abstract_model_field, inherit2_model_field) self.assertLess(inherit1_model_field, inherit2_model_field) def test_hash_immutability(self): field = models.IntegerField() field_hash = hash(field) class MyModel(models.Model): rank = field self.assertEqual(field_hash, hash(field)) class ChoicesTests(SimpleTestCase): @classmethod def setUpClass(cls): super().setUpClass() cls.no_choices = Choiceful._meta.get_field("no_choices") cls.empty_choices = Choiceful._meta.get_field("empty_choices") cls.empty_choices_bool = Choiceful._meta.get_field("empty_choices_bool") cls.empty_choices_text = Choiceful._meta.get_field("empty_choices_text") cls.with_choices = Choiceful._meta.get_field("with_choices") def test_choices(self): self.assertIsNone(self.no_choices.choices) self.assertEqual(self.empty_choices.choices, ()) self.assertEqual(self.with_choices.choices, [(1, "A")]) def test_flatchoices(self): self.assertEqual(self.no_choices.flatchoices, []) self.assertEqual(self.empty_choices.flatchoices, []) self.assertEqual(self.with_choices.flatchoices, [(1, "A")]) def test_check(self): self.assertEqual(Choiceful.check(), []) def test_invalid_choice(self): model_instance = None # Actual model instance not needed. self.no_choices.validate(0, model_instance) msg = "['Value 99 is not a valid choice.']" with self.assertRaisesMessage(ValidationError, msg): self.empty_choices.validate(99, model_instance) with self.assertRaisesMessage(ValidationError, msg): self.with_choices.validate(99, model_instance) def test_formfield(self): no_choices_formfield = self.no_choices.formfield() self.assertIsInstance(no_choices_formfield, forms.IntegerField) fields = ( self.empty_choices, self.with_choices, self.empty_choices_bool, self.empty_choices_text, ) for field in fields: with self.subTest(field=field): self.assertIsInstance(field.formfield(), forms.ChoiceField) class GetFieldDisplayTests(SimpleTestCase): def test_choices_and_field_display(self): """ get_choices() interacts with get_FIELD_display() to return the expected values. """ self.assertEqual(Whiz(c=1).get_c_display(), "First") # A nested value self.assertEqual(Whiz(c=0).get_c_display(), "Other") # A top level value self.assertEqual(Whiz(c=9).get_c_display(), 9) # Invalid value self.assertIsNone(Whiz(c=None).get_c_display()) # Blank value self.assertEqual(Whiz(c="").get_c_display(), "") # Empty value self.assertEqual(WhizDelayed(c=0).get_c_display(), "Other") # Delayed choices def test_get_FIELD_display_translated(self): """A translated display value is coerced to str.""" val = Whiz(c=5).get_c_display() self.assertIsInstance(val, str) self.assertEqual(val, "translated") def test_overriding_FIELD_display(self): class FooBar(models.Model): foo_bar = models.IntegerField(choices=[(1, "foo"), (2, "bar")]) def get_foo_bar_display(self): return "something" f = FooBar(foo_bar=1) self.assertEqual(f.get_foo_bar_display(), "something") def test_overriding_inherited_FIELD_display(self): class Base(models.Model): foo = models.CharField(max_length=254, choices=[("A", "Base A")]) class Meta: abstract = True class Child(Base): foo = models.CharField( max_length=254, choices=[("A", "Child A"), ("B", "Child B")] ) self.assertEqual(Child(foo="A").get_foo_display(), "Child A") self.assertEqual(Child(foo="B").get_foo_display(), "Child B") def test_iterator_choices(self): """ get_choices() works with Iterators. """ self.assertEqual(WhizIter(c=1).c, 1) # A nested value self.assertEqual(WhizIter(c=9).c, 9) # Invalid value self.assertIsNone(WhizIter(c=None).c) # Blank value self.assertEqual(WhizIter(c="").c, "") # Empty value def test_empty_iterator_choices(self): """ get_choices() works with empty iterators. """ self.assertEqual(WhizIterEmpty(c="a").c, "a") # A nested value self.assertEqual(WhizIterEmpty(c="b").c, "b") # Invalid value self.assertIsNone(WhizIterEmpty(c=None).c) # Blank value self.assertEqual(WhizIterEmpty(c="").c, "") # Empty value class GetChoicesTests(SimpleTestCase): def test_empty_choices(self): choices = [] f = models.CharField(choices=choices) self.assertEqual(f.get_choices(include_blank=False), choices) def test_blank_in_choices(self): choices = [("", "<><>"), ("a", "A")] f = models.CharField(choices=choices) self.assertEqual(f.get_choices(include_blank=True), choices) def test_blank_in_grouped_choices(self): choices = [ ("f", "Foo"), ("b", "Bar"), ( "Group", ( ("", "No Preference"), ("fg", "Foo"), ("bg", "Bar"), ), ), ] f = models.CharField(choices=choices) self.assertEqual(f.get_choices(include_blank=True), choices) def test_lazy_strings_not_evaluated(self): lazy_func = lazy(lambda x: 0 / 0, int) # raises ZeroDivisionError if evaluated. f = models.CharField(choices=[(lazy_func("group"), (("a", "A"), ("b", "B")))]) self.assertEqual(f.get_choices(include_blank=True)[0], ("", "---------")) class GetChoicesOrderingTests(TestCase): @classmethod def setUpTestData(cls): cls.foo1 = Foo.objects.create(a="a", d="12.35") cls.foo2 = Foo.objects.create(a="b", d="12.34") cls.bar1 = Bar.objects.create(a=cls.foo1, b="b") cls.bar2 = Bar.objects.create(a=cls.foo2, b="a") cls.field = Bar._meta.get_field("a") def assertChoicesEqual(self, choices, objs): self.assertEqual(choices, [(obj.pk, str(obj)) for obj in objs]) def test_get_choices(self): self.assertChoicesEqual( self.field.get_choices(include_blank=False, ordering=("a",)), [self.foo1, self.foo2], ) self.assertChoicesEqual( self.field.get_choices(include_blank=False, ordering=("-a",)), [self.foo2, self.foo1], ) def test_get_choices_default_ordering(self): self.addCleanup(setattr, Foo._meta, "ordering", Foo._meta.ordering) Foo._meta.ordering = ("d",) self.assertChoicesEqual( self.field.get_choices(include_blank=False), [self.foo2, self.foo1] ) def test_get_choices_reverse_related_field(self): self.assertChoicesEqual( self.field.remote_field.get_choices(include_blank=False, ordering=("a",)), [self.bar1, self.bar2], ) self.assertChoicesEqual( self.field.remote_field.get_choices(include_blank=False, ordering=("-a",)), [self.bar2, self.bar1], ) def test_get_choices_reverse_related_field_default_ordering(self): self.addCleanup(setattr, Bar._meta, "ordering", Bar._meta.ordering) Bar._meta.ordering = ("b",) self.assertChoicesEqual( self.field.remote_field.get_choices(include_blank=False), [self.bar2, self.bar1], ) class GetChoicesLimitChoicesToTests(TestCase): @classmethod def setUpTestData(cls): cls.foo1 = Foo.objects.create(a="a", d="12.34") cls.foo2 = Foo.objects.create(a="b", d="12.34") cls.bar1 = Bar.objects.create(a=cls.foo1, b="b") cls.bar2 = Bar.objects.create(a=cls.foo2, b="a") cls.field = Bar._meta.get_field("a") def assertChoicesEqual(self, choices, objs): self.assertCountEqual(choices, [(obj.pk, str(obj)) for obj in objs]) def test_get_choices(self): self.assertChoicesEqual( self.field.get_choices(include_blank=False, limit_choices_to={"a": "a"}), [self.foo1], ) self.assertChoicesEqual( self.field.get_choices(include_blank=False, limit_choices_to={}), [self.foo1, self.foo2], ) def test_get_choices_reverse_related_field(self): field = self.field.remote_field self.assertChoicesEqual( field.get_choices(include_blank=False, limit_choices_to={"b": "b"}), [self.bar1], ) self.assertChoicesEqual( field.get_choices(include_blank=False, limit_choices_to={}), [self.bar1, self.bar2], )