Support for bulk create. Closes #1965.

rest_framework/fields.py

@@ -943,7 +943,7 @@ class ChoiceField(Field):
 class MultipleChoiceField(ChoiceField):
     default_error_messages = {
         'invalid_choice': _('`{input}` is not a valid choice.'),
-        'not_a_list': _('Expected a list of items but got type `{input_type}`')
+        'not_a_list': _('Expected a list of items but got type `{input_type}`.')
     }
     default_empty_html = []
 

rest_framework/serializers.py

@@ -90,10 +90,8 @@ class BaseSerializer(Field):
         raise NotImplementedError('`create()` must be implemented.')
 
     def save(self, **kwargs):
-        validated_data = self.validated_data
-        if kwargs:
         validated_data = dict(
-                list(validated_data.items()) +
+            list(self.validated_data.items()) +
             list(kwargs.items())
         )
 
@@ -210,9 +208,9 @@ class BoundField(object):
 
 class NestedBoundField(BoundField):
     """
-    This BoundField additionally implements __iter__ and __getitem__
+    This `BoundField` additionally implements __iter__ and __getitem__
     in order to support nested bound fields. This class is the type of
-    BoundField that is used for serializer fields.
+    `BoundField` that is used for serializer fields.
     """
     def __iter__(self):
         for field in self.fields.values():
@@ -460,6 +458,10 @@ class ListSerializer(BaseSerializer):
     child = None
     many = True
 
+    default_error_messages = {
+        'not_a_list': _('Expected a list of items but got type `{input_type}`.')
+    }
+
     def __init__(self, *args, **kwargs):
         self.child = kwargs.pop('child', copy.deepcopy(self.child))
         assert self.child is not None, '`child` is a required argument.'
@@ -485,7 +487,31 @@ class ListSerializer(BaseSerializer):
         """
         if html.is_html_input(data):
             data = html.parse_html_list(data)
-        return [self.child.run_validation(item) for item in data]
+
+        if not isinstance(data, list):
+            message = self.error_messages['not_a_list'].format(
+                input_type=type(data).__name__
+            )
+            raise ValidationError({
+                api_settings.NON_FIELD_ERRORS_KEY: [message]
+            })
+
+        ret = []
+        errors = ReturnList(serializer=self)
+
+        for item in data:
+            try:
+                validated = self.child.run_validation(item)
+            except ValidationError, exc:
+                errors.append(exc.detail)
+            else:
+                ret.append(validated)
+                errors.append({})
+
+        if any(errors):
+            raise ValidationError(errors)
+
+        return ret
 
     def to_representation(self, data):
         """
@@ -497,8 +523,25 @@ class ListSerializer(BaseSerializer):
             serializer=self
         )
 
-    def create(self, attrs_list):
-        return [self.child.create(attrs) for attrs in attrs_list]
+    def save(self, **kwargs):
+        assert self.instance is None, (
+            "Serializers do not support multiple update by default, because "
+            "it would be unclear how to deal with insertions, updates and "
+            "deletions. If you need to support multiple update, use a "
+            "`ListSerializer` class and override `.save()` so you can specify "
+            "the behavior exactly."
+        )
+
+        validated_data = [
+            dict(list(attrs.items()) + list(kwargs.items()))
+            for attrs in self.validated_data
+        ]
+
+        self.instance = [
+            self.child.create(attrs) for attrs in validated_data
+        ]
+
+        return self.instance
 
     def __repr__(self):
         return representation.list_repr(self, indent=1)

tests/test_fields.py

@@ -859,7 +859,7 @@ class TestMultipleChoiceField(FieldValues):
         ('aircon', 'manual'): set(['aircon', 'manual']),
     }
     invalid_inputs = {
-        'abc': ['Expected a list of items but got type `str`'],
+        'abc': ['Expected a list of items but got type `str`.'],
         ('aircon', 'incorrect'): ['`incorrect` is not a valid choice.']
     }
     outputs = [

tests/test_serializer_bulk_update.py

@@ -1,123 +1,123 @@
-# """
-# Tests to cover bulk create and update using serializers.
-# """
-# from __future__ import unicode_literals
-# from django.test import TestCase
-# from rest_framework import serializers
+"""
+Tests to cover bulk create and update using serializers.
+"""
+from __future__ import unicode_literals
+from django.test import TestCase
+from rest_framework import serializers
 
 
-# class BulkCreateSerializerTests(TestCase):
-#     """
-#     Creating multiple instances using serializers.
-#     """
+class BulkCreateSerializerTests(TestCase):
+    """
+    Creating multiple instances using serializers.
+    """
 
-#     def setUp(self):
-#         class BookSerializer(serializers.Serializer):
-#             id = serializers.IntegerField()
-#             title = serializers.CharField(max_length=100)
-#             author = serializers.CharField(max_length=100)
+    def setUp(self):
+        class BookSerializer(serializers.Serializer):
+            id = serializers.IntegerField()
+            title = serializers.CharField(max_length=100)
+            author = serializers.CharField(max_length=100)
 
-#         self.BookSerializer = BookSerializer
+        self.BookSerializer = BookSerializer
 
-#     def test_bulk_create_success(self):
-#         """
-#         Correct bulk update serialization should return the input data.
-#         """
+    def test_bulk_create_success(self):
+        """
+        Correct bulk update serialization should return the input data.
+        """
 
-#         data = [
-#             {
-#                 'id': 0,
-#                 'title': 'The electric kool-aid acid test',
-#                 'author': 'Tom Wolfe'
-#             }, {
-#                 'id': 1,
-#                 'title': 'If this is a man',
-#                 'author': 'Primo Levi'
-#             }, {
-#                 'id': 2,
-#                 'title': 'The wind-up bird chronicle',
-#                 'author': 'Haruki Murakami'
-#             }
-#         ]
+        data = [
+            {
+                'id': 0,
+                'title': 'The electric kool-aid acid test',
+                'author': 'Tom Wolfe'
+            }, {
+                'id': 1,
+                'title': 'If this is a man',
+                'author': 'Primo Levi'
+            }, {
+                'id': 2,
+                'title': 'The wind-up bird chronicle',
+                'author': 'Haruki Murakami'
+            }
+        ]
 
-#         serializer = self.BookSerializer(data=data, many=True)
-#         self.assertEqual(serializer.is_valid(), True)
-#         self.assertEqual(serializer.object, data)
+        serializer = self.BookSerializer(data=data, many=True)
+        self.assertEqual(serializer.is_valid(), True)
+        self.assertEqual(serializer.validated_data, data)
 
-#     def test_bulk_create_errors(self):
-#         """
-#         Correct bulk update serialization should return the input data.
-#         """
+    def test_bulk_create_errors(self):
+        """
+        Incorrect bulk create serialization should return errors.
+        """
 
-#         data = [
-#             {
-#                 'id': 0,
-#                 'title': 'The electric kool-aid acid test',
-#                 'author': 'Tom Wolfe'
-#             }, {
-#                 'id': 1,
-#                 'title': 'If this is a man',
-#                 'author': 'Primo Levi'
-#             }, {
-#                 'id': 'foo',
-#                 'title': 'The wind-up bird chronicle',
-#                 'author': 'Haruki Murakami'
-#             }
-#         ]
-#         expected_errors = [
-#             {},
-#             {},
-#             {'id': ['Enter a whole number.']}
-#         ]
+        data = [
+            {
+                'id': 0,
+                'title': 'The electric kool-aid acid test',
+                'author': 'Tom Wolfe'
+            }, {
+                'id': 1,
+                'title': 'If this is a man',
+                'author': 'Primo Levi'
+            }, {
+                'id': 'foo',
+                'title': 'The wind-up bird chronicle',
+                'author': 'Haruki Murakami'
+            }
+        ]
+        expected_errors = [
+            {},
+            {},
+            {'id': ['A valid integer is required.']}
+        ]
 
-#         serializer = self.BookSerializer(data=data, many=True)
-#         self.assertEqual(serializer.is_valid(), False)
-#         self.assertEqual(serializer.errors, expected_errors)
+        serializer = self.BookSerializer(data=data, many=True)
+        self.assertEqual(serializer.is_valid(), False)
+        self.assertEqual(serializer.errors, expected_errors)
 
-#     def test_invalid_list_datatype(self):
-#         """
-#         Data containing list of incorrect data type should return errors.
-#         """
-#         data = ['foo', 'bar', 'baz']
-#         serializer = self.BookSerializer(data=data, many=True)
-#         self.assertEqual(serializer.is_valid(), False)
+    def test_invalid_list_datatype(self):
+        """
+        Data containing list of incorrect data type should return errors.
+        """
+        data = ['foo', 'bar', 'baz']
+        serializer = self.BookSerializer(data=data, many=True)
+        self.assertEqual(serializer.is_valid(), False)
 
-#         expected_errors = [
-#             {'non_field_errors': ['Invalid data']},
-#             {'non_field_errors': ['Invalid data']},
-#             {'non_field_errors': ['Invalid data']}
-#         ]
+        expected_errors = [
+            {'non_field_errors': ['Invalid data. Expected a dictionary, but got unicode.']},
+            {'non_field_errors': ['Invalid data. Expected a dictionary, but got unicode.']},
+            {'non_field_errors': ['Invalid data. Expected a dictionary, but got unicode.']}
+        ]
 
-#         self.assertEqual(serializer.errors, expected_errors)
+        self.assertEqual(serializer.errors, expected_errors)
 
-#     def test_invalid_single_datatype(self):
-#         """
-#         Data containing a single incorrect data type should return errors.
-#         """
-#         data = 123
-#         serializer = self.BookSerializer(data=data, many=True)
-#         self.assertEqual(serializer.is_valid(), False)
+    def test_invalid_single_datatype(self):
+        """
+        Data containing a single incorrect data type should return errors.
+        """
+        data = 123
+        serializer = self.BookSerializer(data=data, many=True)
+        self.assertEqual(serializer.is_valid(), False)
 
-#         expected_errors = {'non_field_errors': ['Expected a list of items.']}
+        expected_errors = {'non_field_errors': ['Expected a list of items but got type `int`.']}
 
-#         self.assertEqual(serializer.errors, expected_errors)
+        self.assertEqual(serializer.errors, expected_errors)
 
-#     def test_invalid_single_object(self):
-#         """
-#         Data containing only a single object, instead of a list of objects
-#         should return errors.
-#         """
-#         data = {
-#             'id': 0,
-#             'title': 'The electric kool-aid acid test',
-#             'author': 'Tom Wolfe'
-#         }
-#         serializer = self.BookSerializer(data=data, many=True)
-#         self.assertEqual(serializer.is_valid(), False)
+    def test_invalid_single_object(self):
+        """
+        Data containing only a single object, instead of a list of objects
+        should return errors.
+        """
+        data = {
+            'id': 0,
+            'title': 'The electric kool-aid acid test',
+            'author': 'Tom Wolfe'
+        }
+        serializer = self.BookSerializer(data=data, many=True)
+        self.assertEqual(serializer.is_valid(), False)
 
-#         expected_errors = {'non_field_errors': ['Expected a list of items.']}
+        expected_errors = {'non_field_errors': ['Expected a list of items but got type `dict`.']}
 
-#         self.assertEqual(serializer.errors, expected_errors)
+        self.assertEqual(serializer.errors, expected_errors)
 
 
 # class BulkUpdateSerializerTests(TestCase):