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import json
import uuid
from django.core.serializers.json import DjangoJSONEncoder
from django.forms import (
CharField, Form, JSONField, Textarea, TextInput, ValidationError,
)
from django.test import SimpleTestCase
class JSONFieldTest(SimpleTestCase):
def test_valid(self):
field = JSONField()
value = field.clean('{"a": "b"}')
self.assertEqual(value, {'a': 'b'})
def test_valid_empty(self):
field = JSONField(required=False)
self.assertIsNone(field.clean(''))
self.assertIsNone(field.clean(None))
def test_invalid(self):
field = JSONField()
with self.assertRaisesMessage(ValidationError, 'Enter a valid JSON.'):
field.clean('{some badly formed: json}')
def test_prepare_value(self):
field = JSONField()
self.assertEqual(field.prepare_value({'a': 'b'}), '{"a": "b"}')
self.assertEqual(field.prepare_value(None), 'null')
self.assertEqual(field.prepare_value('foo'), '"foo"')
self.assertEqual(field.prepare_value('你好，世界'), '"你好，世界"')
self.assertEqual(field.prepare_value({'a': '😀🐱'}), '{"a": "😀🐱"}')
self.assertEqual(
field.prepare_value(["你好，世界", "jaźń"]),
'["你好，世界", "jaźń"]',
)
def test_widget(self):
field = JSONField()
self.assertIsInstance(field.widget, Textarea)
def test_custom_widget_kwarg(self):
field = JSONField(widget=TextInput)
self.assertIsInstance(field.widget, TextInput)
def test_custom_widget_attribute(self):
"""The widget can be overridden with an attribute."""
class CustomJSONField(JSONField):
widget = TextInput
field = CustomJSONField()
self.assertIsInstance(field.widget, TextInput)
def test_converted_value(self):
field = JSONField(required=False)
tests = [
'["a", "b", "c"]',
'{"a": 1, "b": 2}',
'1',
'1.5',
'"foo"',
'true',
'false',
'null',
]
for json_string in tests:
with self.subTest(json_string=json_string):
val = field.clean(json_string)
self.assertEqual(field.clean(val), val)
def test_has_changed(self):
field = JSONField()
self.assertIs(field.has_changed({'a': True}, '{"a": 1}'), True)
self.assertIs(field.has_changed({'a': 1, 'b': 2}, '{"b": 2, "a": 1}'), False)
def test_custom_encoder_decoder(self):
class CustomDecoder(json.JSONDecoder):
def __init__(self, object_hook=None, *args, **kwargs):
return super().__init__(object_hook=self.as_uuid, *args, **kwargs)
def as_uuid(self, dct):
if 'uuid' in dct:
dct['uuid'] = uuid.UUID(dct['uuid'])
return dct
value = {'uuid': uuid.UUID('{c141e152-6550-4172-a784-05448d98204b}')}
encoded_value = '{"uuid": "c141e152-6550-4172-a784-05448d98204b"}'
field = JSONField(encoder=DjangoJSONEncoder, decoder=CustomDecoder)
self.assertEqual(field.prepare_value(value), encoded_value)
self.assertEqual(field.clean(encoded_value), value)
def test_formfield_disabled(self):
class JSONForm(Form):
json_field = JSONField(disabled=True)
form = JSONForm({'json_field': '["bar"]'}, initial={'json_field': ['foo']})
self.assertIn('["foo"]</textarea>', form.as_p())
def test_redisplay_wrong_input(self):
"""
Displaying a bound form (typically due to invalid input). The form
should not overquote JSONField inputs.
"""
class JSONForm(Form):
name = CharField(max_length=2)
json_field = JSONField()
# JSONField input is valid, name is too long.
form = JSONForm({'name': 'xyz', 'json_field': '["foo"]'})
self.assertNotIn('json_field', form.errors)
self.assertIn('["foo"]</textarea>', form.as_p())
# Invalid JSONField.
form = JSONForm({'name': 'xy', 'json_field': '{"foo"}'})
self.assertEqual(form.errors['json_field'], ['Enter a valid JSON.'])
self.assertIn('{"foo"}</textarea>', form.as_p())
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