django rest framework get data from foreign key relation

Question

I created a user profile using Django auth user so I want to get username, email and phone using UserProfile model serializer, so it is possible to get data from from a foreign-key relation using ModelSerializer in Django rest framework. I am not getting any useful solution from documentation and Google, please help.

class UserProfile(models.Model):
    user = models.ForeignKey(User,)
    phone = models.CharField(max_length=15, blank=True)

class UserProfileSerializer(serializers.ModelSerializer):
    class Meta:
        model=UserProfile
        fields = (phone,'user__username','user__email')

Answer 1

You need to define the username and email fields in your serializer and pass the source argument with dotted notation to traverse attributes in the User model.

You need to do something like:

class UserProfileSerializer(serializers.ModelSerializer):
    username = serializers.CharField(source='user.username', read_only=True)
    email = serializers.EmailField(source='user.email', read_only=True)

    class Meta:
        model=UserProfile
        fields = (phone, username, email)