class Family(models.Model):
    class Meta:
        verbose_name_plural = 'family'
        name = models.CharField(max_length=10)
    def __str__(self):
class Host(models.Model):
    hostname = models.CharField('Hostname', max_length=200)
    family = models.ManyToManyField(Family, related_name="hosts")
    def __str__(self):
        return self.hostname

 class FamilySerializer(ModelSerializer):
    class Meta:
        model = Family
        fields = ('name',)
class HostSerializer(ModelSerializer): 
    class Meta:
        model = Host
        fields = ('hostname', 'family')
        depth = 2

 "family": [
    {
      "id": 7,
      "name": "cisco"
    }
  ],

 "family": "cisco"

 class HostSerializer(ModelSerializer): 
    family = serializers.SlugRelatedField(many=True, read_only=True, slug_field='name')
    class Meta:
        model = Host
        fields = ('hostname', 'family')

 "family": [
    "cisco"
],