CODEWITHSUNDEEP
djangodjango-rest-framework
eksoo
eksoo

Reputation: 111

how to access context in serializer queryset

I'm looking for a way to access the context to filter by current user

 class RemovePermissionsSerializer(serializers.Serializer):
        user_permissions = serializers.PrimaryKeyRelatedField(
            many=True, queryset=Permission.objects.filter(user = context.get('request').user)
        )

I can't access context becuase it's undefined, neither self.context

Upvotes: 0

Views: 753

Answers (3)

Adria Munuera
Adria Munuera

Reputation: 1

Another option is to fabricate the serializer with a method, something like:

def get_remove_permission_serializer(user):      
    class RemovePermissionsSerializer(serializers.Serializer):
                user_permissions = serializers.PrimaryKeyRelatedField(
                    many=True, queryset=Permission.objects.filter(user = user)
                )
    return RemovePermissionsSerializer

I think it is way cleaner than the accepted answer, but it might be an anti-pattern

Upvotes: 0

shiva bahadur basnet
shiva bahadur basnet

Reputation: 223

In order to achieve that override get_fields method in RemovePermissionsSerializer as shown below:

class RemovePermissionsSerializer(serializers.Serializer):

def get_fields(self):
    fields = super().get_fields()
    # If you want your logic according to request method
    request = self.context.get('request')
    if request and request.method.lower() == "<your method here>":
        fields['user_permissions'] = serializers.PrimaryKeyRelatedField(
            many=True, queryset=Permission.objects.filter(user=request.user)
        )
    
    return fields

If you want to change representation according to the action you can do something like this:

class RemovePermissionsSerializer(serializers.Serializer):

def get_fields(self):
    fields = super().get_fields()
    # IF you want your logic according to action
    view = self.context.get('view')
    if view and view.action == "<action name>":
        fields['user_permissions'] = serializers.PrimaryKeyRelatedField(
            many=True, queryset=Permission.objects.filter(user=request.user)
        )
    return fields

Upvotes: 5

WoodyG
WoodyG

Reputation: 200

Did you provide the context when initialising the serializer? If you want the context to be available within the Serializer you will have to provide it yourself, like:

serializer = RemovePermissionsSerializer(instance, context={"request": request})

or

serializer = RemovePermissionsSerializer(instance, context={"user": request.user})

That is, the request context is not automatically available in the serializer

Upvotes: 0

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