title: django-taggit field not saving list Initially
body: <p>I am using django-taggit for tags. I want to add all other fields of the same table in tags automatically when I save the data table. I am using the postsave method but all fields value are saved in the tags table but not in the Tags field of resource table.</p>
  <pre><code>class resource(models.Model):
    title=models.CharField(max_length=100)
    size=models.CharField( max_length=20, default=&quot;&quot;)
    desc=models.TextField(default=&quot;&quot;)
    file=models.FileField(default=&quot;&quot;, blank=True)
    url= models.URLField(max_length=200, blank=True)
    Brand = models.ForeignKey(brand,on_delete=models.CASCADE, default=&quot;&quot;)
    Model = models.ForeignKey(model,on_delete=models.CASCADE, default=&quot;&quot;)
    Categories = models.ForeignKey(category,on_delete=models.CASCADE, default=&quot;&quot;)
    update_at=models.DateField(auto_now=True)
    slug=models.SlugField(default=&quot;&quot;)
    Tags = TaggableManager()
  
  def tag_set(sender, instance,*arg, **kwargs):
    ans= array_tag(instance)
     # print(and)
    mylist = [&quot;firmware&quot;, &quot;download&quot;, &quot;gsm&quot;]
    instance.title='check'
    instance.Tags.add(*ans)
  post_save.connect(tag_set, sender=resource)  
  def array_tag(instance):
    return [instance.title ,instance.desc,instance.size, instance.Brand.title ,instance.Model.title ,instance.Categories.title]
  </code></pre>