I don't understand why specific fields are being dropped within validated_data.
When POSTing input to create() a new instance, the following line:
thisLabel = ClassificationLabel.objects.get(identifier=label.identifier)
throws an error because the identifier attribute is not present:
AttributeError at /api/v1/policies/
'collections.OrderedDict' object has no attribute 'identifier
I have the following serializers within Django REST framework:
serializers.py:
class ClassificationLabelDetailSerializer(serializers.ModelSerializer):
class Meta:
model = ClassificationLabel
fields = ('displayName', 'helpText', 'identifier', 'backgroundColour', 'foregroundColour', 'comment', 'description', 'lastChanged', 'revision')
read_only_fields = ('identifier', 'lastChanged', 'revision',)
class PolicySerializer(serializers.ModelSerializer):
labels = ClassificationLabelDetailSerializer(many=True)
class Meta:
model = Policy
fields = ('displayName', 'identifier', 'labels', 'lastChanged', 'description', 'comment')
read_only_fields = ('identifier', 'lastChanged',)
def create(self,validated_data):
labelData = validated_data.pop('labels')
thisPolicy = Policy.objects.create(**validated_data)
for label in labelData:
for k, v in label.items():
print(k, v)
thisLabel = ClassificationLabel.objects.get(identifier=label.identifier)#insert organisational filter here
PolicyMemberClassificationLabel.objects.create(policy=thisPolicy, label=thisLabel, order=index)
return thisPolicy
models.py:
class ClassificationLabel(models.Model):
displayName = models.CharField(max_length = 32)
helpText = models.TextField(max_length = 140, blank=True)
backgroundColour = models.CharField(max_length=8)
foregroundColour = models.CharField(max_length=8)
description = models.TextField(max_length = 256, blank=True)
comment = models.TextField(max_length = 1024, blank=True)
lastChanged = models.DateTimeField(auto_now=True, editable=False)
identifier = models.CharField(max_length = 128, blank=True, editable=False)
revision = models.PositiveIntegerField(default=1, editable=False)
def __str__(self):
return self.displayName + " - " + self.identifier
def save(self, *args, **kwargs):
self.revision += 1
#the following code generates a unique identifier and checks it for collisions against existing identifiers
if not self.identifier:
stringCheck = False
while stringCheck is False:
newString = str(uuid.uuid4())
newString.replace('-', '')
doesStringExist = ClassificationLabel.objects.filter(identifier=newString).exists()
if doesStringExist is False:
stringCheck = True
self.identifier = newString
super(ClassificationLabel, self).save(*args, **kwargs) # Call the "real" save() method.
class Policy(models.Model):
description = models.TextField(max_length = 256, blank=True)
comment = models.TextField(max_length = 1024, blank=True)
lastChanged = models.DateTimeField(auto_now =True)
displayName = models.CharField(max_length = 64)
identifier = models.CharField(max_length = 128, blank=True)
labels = models.ManyToManyField(ClassificationLabel, through='PolicyMemberClassificationLabel')
revision = models.PositiveIntegerField(default=1)
class Meta:
verbose_name_plural = 'Policies'
def __str__(self):
return self.displayName + " - " + self.identifier
def save(self, *args, **kwargs):
self.revision += 1
#the following code generates a unique identifier and checks it for collisions against existing identifiers
if not self.identifier:
stringCheck = False
while stringCheck is False:
newString = str(uuid.uuid4())
newString.replace('-', '')
doesStringExist = Policy.objects.filter(identifier=newString).count()
if doesStringExist == 0:
stringCheck = True
self.identifier = newString
super(Policy, self).save() # Call the "real" save() method.
class PolicyMemberClassificationLabel(models.Model):
label = models.ForeignKey(ClassificationLabel, related_name='memberLabels')
policy = models.ForeignKey(Policy, related_name='parentPolicy')
order = models.PositiveSmallIntegerField(blank=True)
when sending the following via POST it's dropping the identifier, lastChanged and revision fields from the nested representation within validated_data.
{
"labels": [
{
"displayName": "Test name",
"helpText": "Wayfarers sartorial authentic, small batch readymade disrupt coloring book. Wayfarers sartorial authentic, small batch readymade disrupt col",
"identifier": "fa27e9bd-5007-4874-b10c-46b63c7c8a86",
"backgroundColour": "#808900",
"foregroundColour": "#000000",
"comment": "Wayfarers sartorial authentic, small batch readymade disrupt coloring book.",
"description": "Wayfarers sartorial authentic, small batch readymade disrupt coloring book.",
"lastChanged": "2017-07-03T09:26:20.450681Z",
"revision": 2
},
{
"displayName": "Test name 1",
"helpText": "Wayfarers sartorial authentic, small batch readymade disrupt coloring book.",
"identifier": "29c968dd-8b83-4374-962d-32b9ef527e1b",
"backgroundColour": "#9f0500",
"foregroundColour": "#FFFFFF",
"comment": "Wayfarers sartorial authentic, small batch readymade disrupt coloring book.",
"description": "Wayfarers sartorial authentic, small batch readymade disrupt coloring book.",
"lastChanged": "2017-07-03T09:25:52.955293Z",
"revision": 2
}
]
}
- I can see that the serializer .is_valid() is True for the PolicySerializer
- when I look at validated_data those three fields are missing (the rest are there)
- I've tried commenting out the
read_only_fieldsand that doesn't seem to make any difference - I've been referencing the DRF documentation here
My question: How do I get the identifier field within the validated_data of the nested representation?