import datetime import decimal import json import re from django.core import serializers from django.core.serializers.base import DeserializationError from django.core.serializers.json import DjangoJSONEncoder from django.db import models from django.test import SimpleTestCase, TestCase, TransactionTestCase from django.test.utils import isolate_apps from django.utils.translation import gettext_lazy, override from .models import Score from .tests import SerializersTestBase, SerializersTransactionTestBase class JsonSerializerTestCase(SerializersTestBase, TestCase): serializer_name = "json" pkless_str = """[ { "pk": null, "model": "serializers.category", "fields": {"name": "Reference"} }, { "model": "serializers.category", "fields": {"name": "Non-fiction"} }]""" mapping_ordering_str = """[ { "model": "serializers.article", "pk": %(article_pk)s, "fields": { "author": %(author_pk)s, "headline": "Poker has no place on ESPN", "pub_date": "2006-06-16T11:00:00", "categories": [ %(first_category_pk)s, %(second_category_pk)s ], "meta_data": [], "topics": [] } } ] """ @staticmethod def _validate_output(serial_str): try: json.loads(serial_str) except Exception: return False else: return True @staticmethod def _get_pk_values(serial_str): serial_list = json.loads(serial_str) return [obj_dict["pk"] for obj_dict in serial_list] @staticmethod def _get_field_values(serial_str, field_name): serial_list = json.loads(serial_str) return [ obj_dict["fields"][field_name] for obj_dict in serial_list if field_name in obj_dict["fields"] ] def test_indentation_whitespace(self): s = serializers.json.Serializer() json_data = s.serialize([Score(score=5.0), Score(score=6.0)], indent=2) for line in json_data.splitlines(): if re.search(r".+,\s*$", line): self.assertEqual(line, line.rstrip()) @isolate_apps("serializers") def test_custom_encoder(self): class ScoreDecimal(models.Model): score = models.DecimalField() class CustomJSONEncoder(json.JSONEncoder): def default(self, o): if isinstance(o, decimal.Decimal): return str(o) return super().default(o) s = serializers.json.Serializer() json_data = s.serialize( [ScoreDecimal(score=decimal.Decimal(1.0))], cls=CustomJSONEncoder ) self.assertIn('"fields": {"score": "1"}', json_data) def test_json_deserializer_exception(self): with self.assertRaises(DeserializationError): for obj in serializers.deserialize("json", """[{"pk":1}"""): pass def test_helpful_error_message_invalid_pk(self): """ If there is an invalid primary key, the error message should contain the model associated with it. """ test_string = """[{ "pk": "badpk", "model": "serializers.player", "fields": { "name": "Bob", "rank": 1, "team": "Team" } }]""" with self.assertRaisesMessage( DeserializationError, "(serializers.player:pk=badpk)" ): list(serializers.deserialize("json", test_string)) def test_helpful_error_message_invalid_field(self): """ If there is an invalid field value, the error message should contain the model associated with it. """ test_string = """[{ "pk": "1", "model": "serializers.player", "fields": { "name": "Bob", "rank": "invalidint", "team": "Team" } }]""" expected = "(serializers.player:pk=1) field_value was 'invalidint'" with self.assertRaisesMessage(DeserializationError, expected): list(serializers.deserialize("json", test_string)) def test_helpful_error_message_for_foreign_keys(self): """ Invalid foreign keys with a natural key should throw a helpful error message, such as what the failing key is. """ test_string = """[{ "pk": 1, "model": "serializers.category", "fields": { "name": "Unknown foreign key", "meta_data": [ "doesnotexist", "metadata" ] } }]""" key = ["doesnotexist", "metadata"] expected = "(serializers.category:pk=1) field_value was '%r'" % key with self.assertRaisesMessage(DeserializationError, expected): list(serializers.deserialize("json", test_string)) def test_helpful_error_message_for_many2many_non_natural(self): """ Invalid many-to-many keys should throw a helpful error message. """ test_string = """[{ "pk": 1, "model": "serializers.article", "fields": { "author": 1, "headline": "Unknown many to many", "pub_date": "2014-09-15T10:35:00", "categories": [1, "doesnotexist"] } }, { "pk": 1, "model": "serializers.author", "fields": { "name": "Agnes" } }, { "pk": 1, "model": "serializers.category", "fields": { "name": "Reference" } }]""" expected = "(serializers.article:pk=1) field_value was 'doesnotexist'" with self.assertRaisesMessage(DeserializationError, expected): list(serializers.deserialize("json", test_string)) def test_helpful_error_message_for_many2many_natural1(self): """ Invalid many-to-many keys should throw a helpful error message. This tests the code path where one of a list of natural keys is invalid. """ test_string = """[{ "pk": 1, "model": "serializers.categorymetadata", "fields": { "kind": "author", "name": "meta1", "value": "Agnes" } }, { "pk": 1, "model": "serializers.article", "fields": { "author": 1, "headline": "Unknown many to many", "pub_date": "2014-09-15T10:35:00", "meta_data": [ ["author", "meta1"], ["doesnotexist", "meta1"], ["author", "meta1"] ] } }, { "pk": 1, "model": "serializers.author", "fields": { "name": "Agnes" } }]""" key = ["doesnotexist", "meta1"] expected = "(serializers.article:pk=1) field_value was '%r'" % key with self.assertRaisesMessage(DeserializationError, expected): for obj in serializers.deserialize("json", test_string): obj.save() def test_helpful_error_message_for_many2many_natural2(self): """ Invalid many-to-many keys should throw a helpful error message. This tests the code path where a natural many-to-many key has only a single value. """ test_string = """[{ "pk": 1, "model": "serializers.article", "fields": { "author": 1, "headline": "Unknown many to many", "pub_date": "2014-09-15T10:35:00", "meta_data": [1, "doesnotexist"] } }, { "pk": 1, "model": "serializers.categorymetadata", "fields": { "kind": "author", "name": "meta1", "value": "Agnes" } }, { "pk": 1, "model": "serializers.author", "fields": { "name": "Agnes" } }]""" expected = "(serializers.article:pk=1) field_value was 'doesnotexist'" with self.assertRaisesMessage(DeserializationError, expected): for obj in serializers.deserialize("json", test_string, ignore=False): obj.save() def test_helpful_error_message_for_many2many_not_iterable(self): """ Not iterable many-to-many field value throws a helpful error message. """ test_string = """[{ "pk": 1, "model": "serializers.m2mdata", "fields": {"data": null} }]""" expected = "(serializers.m2mdata:pk=1) field_value was 'None'" with self.assertRaisesMessage(DeserializationError, expected): next(serializers.deserialize("json", test_string, ignore=False)) class JsonSerializerTransactionTestCase( SerializersTransactionTestBase, TransactionTestCase ): serializer_name = "json" fwd_ref_str = """[ { "pk": 1, "model": "serializers.article", "fields": { "headline": "Forward references pose no problem", "pub_date": "2006-06-16T15:00:00", "categories": [1], "author": 1 } }, { "pk": 1, "model": "serializers.category", "fields": { "name": "Reference" } }, { "pk": 1, "model": "serializers.author", "fields": { "name": "Agnes" } }]""" class DjangoJSONEncoderTests(SimpleTestCase): def test_lazy_string_encoding(self): self.assertEqual( json.dumps({"lang": gettext_lazy("French")}, cls=DjangoJSONEncoder), '{"lang": "French"}', ) with override("fr"): self.assertEqual( json.dumps({"lang": gettext_lazy("French")}, cls=DjangoJSONEncoder), '{"lang": "Fran\\u00e7ais"}', ) def test_timedelta(self): duration = datetime.timedelta(days=1, hours=2, seconds=3) self.assertEqual( json.dumps({"duration": duration}, cls=DjangoJSONEncoder), '{"duration": "P1DT02H00M03S"}', ) duration = datetime.timedelta(0) self.assertEqual( json.dumps({"duration": duration}, cls=DjangoJSONEncoder), '{"duration": "P0DT00H00M00S"}', )