问Django Rest Framework @未保存

EN

'Genre' instance expected, got (<Genre: Adventure>, False)

class Movie(models.Model):
    popularity = models.FloatField()
    director = models.CharField(max_length=255)
    imdb_score = models.FloatField()
    name = models.CharField(max_length=255,)

    def __unicode__(self):
        return u'%s' % (self.name)

class Genre(models.Model):
    name =  models.ForeignKey(Movie,related_name='genres',blank=True, null=True)
    genre = models.CharField(max_length=255)

    def __unicode__(self):
        return u'%s' % (self.genre)

class CreatableSlugRelatedField(serializers.SlugRelatedField):

    def to_internal_value(self, data):
        try:
            return self.get_queryset().get_or_create(**{self.slug_field: data})
        except ObjectDoesNotExist:
            self.fail('does_not_exist', slug_name=self.slug_field, value=smart_text(data))
        except (TypeError, ValueError):
            self.fail('invalid')

class MovieSerializer5(serializers.ModelSerializer):
    genres = CreatableSlugRelatedField(many=True,slug_field='genre',queryset=Genre.objects.all())
    class Meta:
        model = Movie
        fields = ('popularity', 'director','imdb_score', 'name', 'genres')

class MovieList(APIView):
    def post(self, request, format=None):
        if not request.user.is_superuser:
            return Response("User is not permitted this action")

        serializer = MovieSerializer5(data=request.data)
        print serializer.initial_data
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data, status=status.HTTP_201_CREATED)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)