Merge f9dd11df72 into 1d404874b3

rest_framework/serializers.py

@@ -15,6 +15,7 @@ import copy
 import datetime
 import inspect
 import types
+import warnings
 from decimal import Decimal
 from django.contrib.contenttypes.generic import GenericForeignKey
 from django.core.paginator import Page
@@ -131,6 +132,31 @@ def _is_protected_type(obj):
     )
 
 
+def _convert_fields(data, mapping):
+    """
+    Takes data as dict or none and str->str map of keys and
+    returns None or new dictionary with converted keys
+    """
+    # Handle translation of serialized fields into non serailzed fields
+    if data is not None:
+        translated_data = copy.deepcopy(data)
+        for key in mapping.keys():
+            if key not in translated_data:
+                continue
+            newkey = mapping.get(key)
+            try:  # MultiValueDict
+                value = translated_data.getlist(key)
+                del translated_data[key]
+                translated_data.setlist(newkey, value)
+            except AttributeError:
+                value = translated_data.pop(key)
+                translated_data[newkey] = value
+    else:  # Data can be None so translated_data is too
+        translated_data = None
+
+    return translated_data
+
+
 def _get_declared_fields(bases, attrs):
     """
     Create a list of serializer field instances from the passed in 'attrs',
@@ -167,6 +193,7 @@ class SerializerOptions(object):
         self.depth = getattr(meta, 'depth', 0)
         self.fields = getattr(meta, 'fields', ())
         self.exclude = getattr(meta, 'exclude', ())
+        self.convert_fields = getattr(meta, 'convert_fields', False)
 
 
 class BaseSerializer(WritableField):
@@ -265,6 +292,20 @@ class BaseSerializer(WritableField):
         """
         return field_name
 
+    def get_field_name_map(self):
+        """
+        Return a map of serialized->python field names
+        """
+        ret = SortedDict()
+        for name, value in list(self.fields.items()):
+            key = self.get_field_key(name)
+            if key in ret:
+                warnings.warn("Duplicate key found in fields. This can happen if `get_field_key`"
+                " can return the same string for two different inputs!  Ensure your keys are unique"
+                " after running them all through `get_field_key`", Warning, stacklevel=3)
+            ret[key] = name
+        return ret
+
     def restore_fields(self, data, files):
         """
         Core of deserialization, together with `restore_object`.
@@ -276,6 +317,10 @@ class BaseSerializer(WritableField):
             self._errors['non_field_errors'] = ['Invalid data']
             return None
 
+        if self.opts.convert_fields:
+            key_map = self.get_field_name_map()
+            data = _convert_fields(data, key_map)
+
         for field_name, field in self.fields.items():
             field.initialize(parent=self, field_name=field_name)
             try:
@@ -758,9 +803,9 @@ class ModelSerializer(Serializer):
                     field.read_only = True
 
                 ret[accessor_name] = field
-        
+
         # Ensure that 'read_only_fields' is an iterable
-        assert isinstance(self.opts.read_only_fields, (list, tuple)), '`read_only_fields` must be a list or tuple' 
+        assert isinstance(self.opts.read_only_fields, (list, tuple)), '`read_only_fields` must be a list or tuple'
 
         # Add the `read_only` flag to any fields that have been specified
         # in the `read_only_fields` option
@@ -775,10 +820,10 @@ class ModelSerializer(Serializer):
                 "on serializer '%s'." %
                 (field_name, self.__class__.__name__))
             ret[field_name].read_only = True
-        
+
         # Ensure that 'write_only_fields' is an iterable
-        assert isinstance(self.opts.write_only_fields, (list, tuple)), '`write_only_fields` must be a list or tuple' 
-        
+        assert isinstance(self.opts.write_only_fields, (list, tuple)), '`write_only_fields` must be a list or tuple'
+
         for field_name in self.opts.write_only_fields:
             assert field_name not in self.base_fields.keys(), (
                 "field '%s' on serializer '%s' specified in "
@@ -789,7 +834,7 @@ class ModelSerializer(Serializer):
                 "Non-existant field '%s' specified in `write_only_fields` "
                 "on serializer '%s'." %
                 (field_name, self.__class__.__name__))
-            ret[field_name].write_only = True            
+            ret[field_name].write_only = True
 
         return ret
 

rest_framework/tests/models.py

@@ -175,3 +175,8 @@ class FilterableItem(models.Model):
     text = models.CharField(max_length=100)
     decimal = models.DecimalField(max_digits=4, decimal_places=2)
     date = models.DateField()
+
+
+class ModelWithUnderscoreFields(RESTFrameworkModel):
+    char_field = models.CharField(max_length=100)
+    number_field = models.IntegerField()

rest_framework/tests/test_serializer.py

@@ -7,9 +7,12 @@ from django.utils import unittest
 from django.utils.datastructures import MultiValueDict
 from django.utils.translation import ugettext_lazy as _
 from rest_framework import serializers, fields, relations
-from rest_framework.tests.models import (HasPositiveIntegerAsChoice, Album, ActionItem, Anchor, BasicModel,
-    BlankFieldModel, BlogPost, BlogPostComment, Book, CallableDefaultValueModel, DefaultValueModel,
-    ManyToManyModel, Person, ReadOnlyManyToManyModel, Photo, RESTFrameworkModel)
+from rest_framework.tests.models import (
+    HasPositiveIntegerAsChoice, Album, ActionItem, Anchor, BasicModel,
+    BlankFieldModel, BlogPost, BlogPostComment, Book, CallableDefaultValueModel,
+    DefaultValueModel, ManyToManyModel, Person, ReadOnlyManyToManyModel,
+    Photo, RESTFrameworkModel, ModelWithUnderscoreFields
+    )
 from rest_framework.tests.models import BasicModelSerializer
 import datetime
 import pickle
@@ -176,6 +179,16 @@ class PositiveIntegerAsChoiceSerializer(serializers.ModelSerializer):
         fields = ['some_integer']
 
 
+class ModelFieldConversionSerializer(serializers.ModelSerializer):
+
+    def get_field_key(self, field_name):
+        return field_name.replace('_','').capitalize()
+
+    class Meta:
+        convert_fields = True
+        model = ModelWithUnderscoreFields
+
+
 class BasicTests(TestCase):
     def setUp(self):
         self.comment = Comment(
@@ -331,6 +344,23 @@ class BasicTests(TestCase):
         exclusions = serializer.get_validation_exclusions()
         self.assertTrue('title' in exclusions, '`title` field was marked `required=False` and should be excluded')
 
+    def test_serialize_with_conversion(self):
+        """
+        Verify keys get converted from serialized value to deserialized value
+        """
+
+        underscore = ModelWithUnderscoreFields(char_field='slartibartfast', number_field=42)
+        underscore.save()
+        serializer = ModelFieldConversionSerializer(underscore)
+        serialized = {'Id': 1, 'Numberfield': 42, 'Charfield':'slartibartfast'}
+        self.assertEqual(serialized, serializer.data, "Validate that serialing data with conversion works")
+
+        serializer = ModelFieldConversionSerializer(data=serialized)
+        self.assertTrue(serializer.is_valid(),
+            'Data should get converted from serialized value into deserialized value')
+        self.assertEqual('slartibartfast', serializer.object.char_field)
+        self.assertEqual(42, serializer.object.number_field)
+
 
 class DictStyleSerializer(serializers.Serializer):
     """
@@ -836,6 +866,22 @@ class ManyToManyTests(TestCase):
         self.assertEqual(instance.pk, 2)
         self.assertEqual(list(instance.rel.all()), [])
 
+    def test_create_empty_relationship_flat_data_field_convert(self):
+        """
+        Create an instance of a model with a ManyToMany relationship,
+        containing no items, using a representation that does not support
+        lists (eg form data).
+        """
+        data = MultiValueDict()
+        data.setlist('rel', [''])
+        self.serializer_class.Meta.convert_fields = True
+        serializer = self.serializer_class(data=data)
+        self.assertEqual(serializer.is_valid(), True)
+        instance = serializer.save()
+        self.assertEqual(len(ManyToManyModel.objects.all()), 2)
+        self.assertEqual(instance.pk, 2)
+        self.assertEqual(list(instance.rel.all()), [])
+
 
 class ReadOnlyManyToManyTests(TestCase):
     def setUp(self):