I am trying to post a message to the database using the following content on the request:
{
"thread": 1,
"content": "lorem ipsum",
"author":
{
"name":"doc",
"email":""
}
}
Instead I get the error message of "Cannot assign "OrderedDict([(u'name', doc'), (u'email', u'')])": "Message.author" must be a "Author" instance."
Each Message has a related author record, that may or may not exist already in the database. At this point I don't mind having repeat entries on that table.
My serializers.py file has the following:
class AuthorSerializer(serializers.Serializer):
pk = serializers.IntegerField(read_only=False, required=False)
name = serializers.CharField(required=True, max_length=50)
email = serializers.CharField(allow_blank=True, allow_null=True, required=False)
def create(self, validated_data):
"""
Create and return a new `Author` instance, given the validated data.
"""
return Author.objects.create(**validated_data)
def update(self, instance, validated_data):
"""
Update and return an existing `Author` instance, given the validated data.
"""
instance.name = validated_data.get('name', instance.name)
instance.email = validated_data.get('email', instance.email)
instance.save()
return instance
class Meta:
model = Author
fields = ('name', 'email')
class MessageSerializer(serializers.Serializer):
pk = serializers.IntegerField(read_only=True)
thread = serializers.PrimaryKeyRelatedField(queryset=Thread.objects.all())
created_at = serializers.DateTimeField(required=False)
content = serializers.CharField(style={'base_template': 'textarea.html'})
author = AuthorSerializer(required=False, read_only=False)
def create(self, validated_data):
"""
Create and return a new `Message` instance, given the validated data.
"""
return Message.objects.create(**validated_data)
def update(self, instance, validated_data):
"""
Update and return an existing `Message` instance, given the validated data.
"""
instance.thread = validated_data.get('thread', instance.thread)
instance.content = validated_data.get('content', instance.content)
instance.author = validated_data.get('author', instance.author)
instance.save()
return instance
class Meta:
model = Message
fields = ('thread', 'created_at', 'content', 'author')
I'm quite lost on how I should proceed, has I expected that AuthorSerializer would be able to parse a list or ordered dictionary into a new or existing object.
According to the docs , you have to create the nested object in your custom create method:
class MessageSerializer(serializers.Serializer):
pk = serializers.IntegerField(read_only=True)
thread = serializers.PrimaryKeyRelatedField(queryset=Thread.objects.all())
created_at = serializers.DateTimeField(required=False)
content = serializers.CharField(style={'base_template': 'textarea.html'})
author = AuthorSerializer(required=False, read_only=False)
def create(self, validated_data):
"""
Create and return a new `Message` instance, given the validated data.
"""
author_data = validated_data.pop('author', None)
if author_data:
author = Author.objects.get_or_create(**author_data)[0]
validated_data['author'] = author
return Message.objects.create(**validated_data)
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