Hiya, friend of mine and I are pretty stumped about a nested fields error,
we're getting the following:
```AssertionError: The `.update()` method does not support writable nested
fields by default. Write an explicit `.update()` method for serializer
`documents.serialisers.DocumentSerializer`, or set `read_only=True` on
nested serializer fields.``` but what is confusing is that *there already
is an update method*. See the code below, really appreciate any thoughts.
```
class DocumentSerializer(OwnedObjectSerializer,
DynamicFieldsModelSerializer):
...
custom_fields = CustomFieldInstanceSerializer(many=True, allow_null=True)
...
def update(self, instance, validated_data):
...
super().update(instance, validated_data)
return instance
def __init__(self, *args, **kwargs):
self.truncate_content = kwargs.pop("truncate_content", False)
super().__init__(*args, **kwargs)
class Meta:
model = Document
depth = 1
fields = (
"id",
"correspondent",
"document_type",
"storage_path",
"title",
"content",
"tags",
"created",
"created_date",
"modified",
"added",
"archive_serial_number",
"original_file_name",
"archived_file_name",
"owner",
"permissions",
"user_can_change",
"set_permissions",
"notes",
"custom_fields",
)
```
```
class CustomFieldSerializer(serializers.ModelSerializer):
class Meta:
model = CustomField
fields = [
"id",
"name",
"data_type",
]
```
```
class CustomFieldInstanceSerializer(serializers.ModelSerializer):
parent = CustomFieldSerializer()
value = SerializerMethodField()
def get_value(self, obj: CustomFieldInstance):
return obj.value
def create(self, validated_data):
parent_data = validated_data.pop("parent")
parent = CustomField.objects.get(id=parent_data["id"])
instance = CustomFieldInstance.objects.create(parent=parent)
return instance
def update(self, instance: CustomFieldInstance):
return instance
class Meta:
model = CustomFieldInstance
fields = [
"parent",
"value",
]
```
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