class Tag(models.Model):
    name = models.CharField("Name", max_length=5000, blank=True)
    taglevel = models.IntegerField("Tag level", blank=True)
    def __str__(self):
        return self.name

class Movie(models.Model):
    title = models.CharField("Whats happening?", max_length=100, blank=True)
    tag = models.ManyToManyField('Tag', blank=True)
    def __str__(self):
        return self.title

class TagSerializer(serializers.ModelSerializer):
    taglevel = filters.CharFilter(taglevel="taglevel")

    class Meta:
        model = Tag
        fields = ('name', 'taglevel', 'id')

class MovieSerializer(serializers.ModelSerializer):
    tag = TagSerializer(many=True, read_only=False)
    info = InfoSerializer(many=True, read_only=True)

    class Meta:
        model = Movie
        fields = ('title', 'tag')

def get_or_create(self, validated_data):
    tags_data = validated_data.pop('tag')
    task = Task.objects.get_or_create(**validated_data)
    for tag_data in tags_data:
        task.tag.get_or_create(**tag_data)
    return task