Django Post request for many to many field ValueError - django-models

Question

I am working on a post request in which the user chooses from a list of tags and makes combinations of tags. The combination of tags should then be posted. Nothing should get changed in the Tag table.
These are the models:
models.py
class Tag(models.Model):
name = models.CharField(max_length=256)
language = models.CharField(max_length=256)
objects = models.Manager()
def __str__(self):
"""Return a human readable representation of the model instance."""
return self.name or ''
#property
def tags(self):
tags = self.tagging.values('tag')
return tags.values('tag_id', 'tag__name', 'tag__language')
class Combination(models.Model):
user = models.ForeignKey(CustomUser, on_delete=models.SET_NULL, null=True)
gameround = models.ForeignKey(Gameround, on_delete=models.CASCADE, null=True)
resource = models.ForeignKey(Resource, on_delete=models.CASCADE, null=True)
tag_id = models.ManyToManyField(Tag, null=True)
created = models.DateTimeField(editable=False)
score = models.PositiveIntegerField(default=0)
objects = models.Manager()
def __str__(self):
return str(self.tag_id) or ''
This is the serializer for Combination.
serializers.py
class CombinationSerializer(serializers.ModelSerializer):
tag_id = TagWithIdSerializer(many=True, required=False, write_only=False)
resource_id = serializers.PrimaryKeyRelatedField(queryset=Resource.objects.all(),
required=True,
source='resource',
write_only=False)
gameround_id = serializers.PrimaryKeyRelatedField(queryset=Gameround.objects.all(),
required=False,
source='gameround',
write_only=False)
user_id = serializers.PrimaryKeyRelatedField(queryset=CustomUser.objects.all(),
required=False,
source='user',
write_only=False)
class Meta:
model = Combination
depth = 1
fields = ('id', 'user_id', 'gameround_id', 'resource_id', 'tag_id', 'created', 'score')
def create(self, validated_data):
user = None
request = self.context.get("request")
if request and hasattr(request, "user"):
user = request.user
score = 0
tag_data = validated_data.pop('tag_id', None)
combination = Combination(
user=user,
gameround=validated_data.get("gameround"),
resource=validated_data.get("resource"),
created=datetime.now(),
score=score
)
combination.save()
for tag_object in tag_data[0]:
combination.tag_id.add(tag_object)
return combination
def to_representation(self, instance):
rep = super().to_representation(instance)
rep['tag_id'] = TagWithIdSerializer(instance.tag_id.all(), many=True).data
return rep
I have tried posting the following JSON object to the database:
{
"gameround_id": 2015685170,
"resource_id": 327888,
"tag_id": [{"id": 2014077506, "name": "corwn","language": "en"}]
}
I am getting a ValueError: Field 'id' expected a number but got 'name'.
How can I fix this issue?

Answer 1

you need to provide tag id for each tag not all tag data,
Try like this
{
"gameround_id": 2015685170,
"resource_id": 327888,
"tag_id": [2014077506,2014077507]
}