Fixed #29522 -- Refactored the Deserializer functions to classes.

Co-authored-by: Emad Mokhtar <emad.mokhtar@veneficus.nl>

tests/serializers/test_deserialization.py

@@ -0,0 +1,125 @@
+import json
+
+from django.core.serializers.base import DeserializationError, DeserializedObject
+from django.core.serializers.json import Deserializer as JsonDeserializer
+from django.core.serializers.jsonl import Deserializer as JsonlDeserializer
+from django.core.serializers.python import Deserializer
+from django.core.serializers.pyyaml import Deserializer as YamlDeserializer
+from django.test import SimpleTestCase
+
+from .models import Author
+
+
+class TestDeserializer(SimpleTestCase):
+    def setUp(self):
+        self.object_list = [
+            {"pk": 1, "model": "serializers.author", "fields": {"name": "Jane"}},
+            {"pk": 2, "model": "serializers.author", "fields": {"name": "Joe"}},
+        ]
+        self.deserializer = Deserializer(self.object_list)
+        self.jane = Author(name="Jane", pk=1)
+        self.joe = Author(name="Joe", pk=2)
+
+    def test_deserialized_object_repr(self):
+        deserial_obj = DeserializedObject(obj=self.jane)
+        self.assertEqual(
+            repr(deserial_obj), "<DeserializedObject: serializers.Author(pk=1)>"
+        )
+
+    def test_next_functionality(self):
+        first_item = next(self.deserializer)
+
+        self.assertEqual(first_item.object, self.jane)
+
+        second_item = next(self.deserializer)
+        self.assertEqual(second_item.object, self.joe)
+
+        with self.assertRaises(StopIteration):
+            next(self.deserializer)
+
+    def test_invalid_model_identifier(self):
+        invalid_object_list = [
+            {"pk": 1, "model": "serializers.author2", "fields": {"name": "Jane"}}
+        ]
+        self.deserializer = Deserializer(invalid_object_list)
+        with self.assertRaises(DeserializationError):
+            next(self.deserializer)
+
+        deserializer = Deserializer(object_list=[])
+        with self.assertRaises(StopIteration):
+            next(deserializer)
+
+    def test_custom_deserializer(self):
+        class CustomDeserializer(Deserializer):
+            @staticmethod
+            def _get_model_from_node(model_identifier):
+                return Author
+
+        deserializer = CustomDeserializer(self.object_list)
+        result = next(iter(deserializer))
+        deserialized_object = result.object
+        self.assertEqual(
+            self.jane,
+            deserialized_object,
+        )
+
+    def test_empty_object_list(self):
+        deserializer = Deserializer(object_list=[])
+        with self.assertRaises(StopIteration):
+            next(deserializer)
+
+    def test_json_bytes_input(self):
+        test_string = json.dumps(self.object_list)
+        stream = test_string.encode("utf-8")
+        deserializer = JsonDeserializer(stream_or_string=stream)
+
+        first_item = next(deserializer)
+        second_item = next(deserializer)
+
+        self.assertEqual(first_item.object, self.jane)
+        self.assertEqual(second_item.object, self.joe)
+
+    def test_jsonl_bytes_input(self):
+        test_string = """
+        {"pk": 1, "model": "serializers.author", "fields": {"name": "Jane"}}
+        {"pk": 2, "model": "serializers.author", "fields": {"name": "Joe"}}
+        {"pk": 3, "model": "serializers.author", "fields": {"name": "John"}}
+        {"pk": 4, "model": "serializers.author", "fields": {"name": "Smith"}}"""
+        stream = test_string.encode("utf-8")
+        deserializer = JsonlDeserializer(stream_or_string=stream)
+
+        first_item = next(deserializer)
+        second_item = next(deserializer)
+
+        self.assertEqual(first_item.object, self.jane)
+        self.assertEqual(second_item.object, self.joe)
+
+    def test_yaml_bytes_input(self):
+        test_string = """- pk: 1
+  model: serializers.author
+  fields:
+    name: Jane
+
+- pk: 2
+  model: serializers.author
+  fields:
+    name: Joe
+
+- pk: 3
+  model: serializers.author
+  fields:
+    name: John
+
+- pk: 4
+  model: serializers.author
+  fields:
+    name: Smith
+"""
+        stream = test_string.encode("utf-8")
+        deserializer = YamlDeserializer(stream_or_string=stream)
+
+        first_item = next(deserializer)
+        second_item = next(deserializer)
+
+        self.assertEqual(first_item.object, self.jane)
+        self.assertEqual(second_item.object, self.joe)