title: How to render my view with additional option
body: <p>I can't make my html render my form with additional option.
  So I need to make that in my html my <code>order_form</code> will be rendered with additional_option that in product. And then place it all in <code>OrderItem</code>.
  I don't understand what I should do</p>
  
  <p>I ve tryied to make queryset <code>queryset=product.objects.get(pk  = 6).add_option.all()</code>
  with specific id but in only shows text <code>QuerySet</code></p>
  
  <p>My form</p>
  
  <pre><code>class Order_form(forms.Form):
      add_option = forms.ModelMultipleChoiceField(widget = forms.CheckboxSelectMultiple, required = False)
  </code></pre>
  
  <p>model 1</p>
  
  <pre><code>class OrderItem(models.Model):
      product = models.OneToOneField(product, on_delete=models.SET_NULL, null=True)
      additional_option = models.ManyToManyField(AdditionalOption)
  </code></pre>
  
  <p>model 2</p>
  
  <pre><code>class product(models.Model):
      add_option = models.ManyToManyField(AdditionalOption, blank = True)
  </code></pre>