Nested JSON and HyperlinkedModelSerializer problem - django

Question

I'm working on a tweet App. I have 2 main models : Tweets and Comments. I'm using HyperlinkedModelSerializer to get absolute url for my comments instances with the "url" added in the field. But when It comes to display the comments inside my tweet JSON format, i have this error :
`HyperlinkedIdentityField` requires the request in the serializer context. Add `context={'request': request}` when instantiating the serializer.
This error is gone when I remove the url from the field.
Here is my Comment Model :
class CommentManager(models.Manager):
def filter_by_instance(self, instance):
content_type = ContentType.objects.get_for_model(instance.__class__)
obj_id = instance.id
qs = super(CommentManager, self).filter(content_type=content_type, object_id=obj_id)
return qs
class Comment(models.Model):
content = models.TextField(max_length=150)
author = models.ForeignKey(
User,
on_delete = models.CASCADE
)
content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)
object_id = models.PositiveIntegerField(blank=True)
content_object = GenericForeignKey('content_type', 'object_id')
parent = models.ForeignKey(
"self",
on_delete = models.CASCADE,
blank=True,
null=True
)
datestamp = models.DateTimeField(auto_now_add=True)
objects = CommentManager()
def __str__(self):
return str(self.content[:30])
def save(self):
self.object_id = self.parent.id
super(Comment, self).save()
def children(self):
return Comment.objects.filter(parent=self)
#property
def is_parent(self):
if self.parent is None:
return False
return True
Here is my comment serializer :
class CommentSerializer(serializers.HyperlinkedModelSerializer):
children = serializers.SerializerMethodField()
datestamp = serializers.SerializerMethodField()
def get_datestamp(self, obj):
return obj.datestamp.date()
def get_children(self, obj):
qs = obj.children()
return ChildrenCommentSerializer(qs, many=True).data
class Meta:
model = Comment
fields = [
"url",
"datestamp",
"content",
"is_parent",
"object_id",
"children"
]
class ChildrenCommentSerializer(serializers.ModelSerializer):
class Meta:
model = Comment
fields = [
"content"
]
And finally my tweet serializer :
class TweetSerializer(serializers.ModelSerializer):
author = serializers.SlugRelatedField(slug_field="username", queryset=User.objects.all())
comments = serializers.SerializerMethodField()
datestamp = serializers.SerializerMethodField()
def get_datestamp(self, obj):
return obj.datestamp.date()
def get_comments(self, obj):
qs = Comment.objects.filter_by_instance(obj)
print()
print()
print(CommentSerializer(qs, many=True))
print()
print()
return CommentSerializer(qs, many=True).data
class Meta:
model = Tweet
fields = ["datestamp", "id", "content", "author", "nb_likes", "nb_comments", "slug", "comments" ]
def to_representation(self, obj):
representation = super().to_representation(obj)
if obj.nb_likes > 50:
representation['super_popular'] = True
return representation
I do not understand how and where in the code i should add the "context={'request': request}"

Answer 1

place it when instantiating the serializer
class ViewExample(APIView):
def get(self, request, pk, format=None):
listexample = Example.objects.all()
serializer = ExampleSerializer(listexample, many=True, context={'request':request})
return Response(serializer.data, status=status.HTTP_200_OK)