Limit choices to foreignkey in django rest framework

Question

How to limit images of request.user to be linked with node. I wish I could do something like:

photo = models.ForeignKey(
    Image,
    limit_choices_to={\'owner         


        

Answer 1

class CustomForeignKey(serializers.PrimaryKeyRelatedField):
    def get_queryset(self):
        return Table.objects.filter(is_active=True)

class Serializer(serializers.ModelSerializer):
    (...)
   table= CustomForeignKey()
   class Meta:
   (...)

even more easy is :

class Serializer(serializers.ModelSerializer):
    (...)
    table = serializers.PrimaryKeyRelatedField(queryset=Table.objects.filter(is_active=True)) 
    class Meta:
    (...)

Answer 2

from rest_framework import serializers

class CustomForeignKey(serializers.PrimaryKeyRelatedField):
    def get_queryset(self):
        return Table.objects.filter(user=self.context['request'].user)
        # or: ...objects.filter(user=serializers.CurrentUserDefault()(self))

class Serializer(serializers.ModelSerializer):
   table = CustomForeignKey()

Answer 3

Because I am sure this logic will be used across an entire Django application why not make it more generic?

class YourPrimaryKeyRelatedField(serializers.PrimaryKeyRelatedField):

    def __init__(self, **kwargs):
        self.model = kwargs.pop('model')
        assert hasattr(self.model, 'owner')
        super().__init__(**kwargs)


    def get_queryset(self):
        return self.model.objects.filter(owner=self.context['request'].user)

serializers.py

class SomeModelSerializersWithABunchOfOwners(serializers.ModelSerializer):

    photo = YourPrimaryKeyRelatedField(model=Photo)
    categories = YourPrimaryKeyRelatedField(model=Category,
                                            many=True)
    # ...

Answer 4

I would deal with this by overriding get_serializer_class to dynamically return a serializer class at runtime, setting the choices option on the field there:

def get_serializer_class(self, ...):
    user = self.request.user
    owner_choices = ...  # However you want to restrict the choices

    class ImageSerializer(serializers.ModelSerializer):
        owner = serializers.Field('owner.username', choices=owner_choices)

        class Meta:
            model = Image
            fields = ('file', 'owner')

    return ImageSerializer

Answer 5

You can create a custom foreign key field and define get_queryset() method there to filter related objects to only those of your user. The current user can be retrieved from the request in the context:

class UserPhotoForeignKey(serializers.PrimaryKeyRelatedField):
    def get_queryset(self):
        return Image.objects.filter(owner=self.context['request'].user)

class NodeSerializer(serializers.HyperlinkedModelSerializer):
    photo = UserPhotoForeignKey()
    class Meta:
        model = Node
        fields = ('content', 'photo', 'owner')

This example is using Django REST Framework version 3.