title: Select all choices in a ManyToManyField by default
body: <p>Is it possible somehow by default to choose all the choices within a select multiple generated by ManyToManyField in Django?</p>
  
  <p>All new items that are added should have all choices selected upfront in the view (also when adding new items of <code>AnotherEntity</code>).</p>
  
  <pre><code>class AnotherEntity(models.Model):
      name = models.CharField()
  
  class SomeEntity(models.Model): 
      anotherEntity = models.ManyToManyField(AnotherEntity)
  </code></pre>
  
  <p>In the example above i wish to have all  choices in <code>anotherEntity</code> selected in all new items.</p>