如何从 django 用户模型中获取用户名

Question

I have the following where a comment is posted via a POST request

urlpatterns = [
    path("recipes/comments/", RecipeCommentView.as_view(), name="post_comment"),  # POST
]

Views.py

@permission_classes([AllowAny])
class RecipeCommentView(generics.CreateAPIView):
    queryset = models.RecipeComment.objects.all()
    serializer_class = RecipeCommentSerializer

Serializers.py

class UserSerialiser(serializers.ModelSerializer):
    class Meta:
        model = models.User
        fields = ["username"]

class RecipeCommentSerializer(serializers.ModelSerializer):
    published_by = UserSerialiser(read_only=True)

    class Meta:
        model = models.PublishedRecipeComment
        fields = ["recipe", "published_by", "content", "created_at"]
        ordering = ["position"]

Models.py

class RecipeComment(models.Model):
    recipe = models.ForeignKey(Recipe, on_delete=models.PROTECT, related_name="comments")
    published_by = models.ForeignKey(User, on_delete=models.PROTECT, null=True)
    content = models.CharField(max_length=2500)
    created_at = models.DateTimeField(auto_now_add=True)

I am using the User model from django.contrib.auth.models, how can I have the username of the currently logged in user attached to the published_by field?

When I go to check the recently added comment that i have POSTed, the username does not show, it shows me null:

{
    "recipe": 1,
    "published_by": null,
    "content": "this is a comment",
    "created_at": "2021-07-24T12:13:10.391236Z"
}

I'm looking to populate the published_by field with the username of the user that has posted it.

Answer 1

It must be work well, i tested it:

class RecipeCommentSerializer(serializers.ModelSerializer):
    published_by = UserSerialiser(read_only=True)

    class Meta:
        model = models.PublishedRecipeComment
        fields = ["recipe", "published_by", "content", "created_at"]
        ordering = ["position"]

    def create(self, validated_data):
        request = self.context['request']
        ModelClass = self.Meta.model
        
        instance = ModelClass.objects.create(
            **validated_data,
            **{
                'published_by': request.user
            }
        )
        return instance