title: Not addind one-to-many relationship
body: <p>I hava class </p>
  
  <pre><code>class Read(models.Model):
     class Meta:
      verbose_name_plural = 'reads'
  
     id=models.AutoField(primary_key=True);
     name = models.CharField(max_length=30, null=True);
     owner_reader = models.ForeignKey(User, related_name='owner_reader', null=False, blank=True,on_delete=models.PROTECT)  # тот, кто прочитал
     articles_readed = models.ManyToManyField(Article, null=False, related_name='articles_readed')  # те, на кого он пдписалса
  </code></pre>
  
  <p>And want adding article to read item:</p>
  
  <pre><code>def mark_readed(request,id):
      #id -article id
      user =request.user # подписант
      try:
          reader1 = Read.objects.get(name='test',owner_reader=request.user)  
      except Read.DoesNotExist:
          reader1 = Read.objects.create(name='test',owner_reader=request.user)
      article = Article.objects.get(pk=id) 
      reader1.articles_readed.add=article
      reader1.save();
      return main(request)
  </code></pre>
  
  <p>But in result I have only readed item wisout articles.</p>