gistfile1.txt

         <option value="1" selected >1</option>
        
      
        
          <option value="2"  >2</option>
        
      
        
          <option value="3" selected >3</option>
        
      
        
          <option value="4"  >4</option>
        
      
        
          <option value="5"  >5</option>
        
      
        
          <option value="6"  >6</option>
        
      
        
          <option value="7"  >7</option>
        
      
        
          <option value="8"  >8</option>
        
      
        
          <option value="9"  >9</option>
        
      
        
          <option value="10"  >10</option>
        
      
        
          <option value="11"  >11</option>
        
      
        
          <option value="12"  >12</option>
        
      
        
          <option value="13" selected >13</option>

The Raw Data tab show the following:

{
    "id": 12,
    "builds": [
        13
    ],
    "note": "",
    "status": null,
    "created": "2015-09-18T22:10:33.149569"
}

Looks to be coming through:
https://github.com/tomchristie/django-rest-framework/blob/f601c6c1c36a3450f4047b10d3b0955a511080a0/rest_framework/templates/rest_framework/inline/select_multiple.html#L18

My model:

class Release(models.Model):

    class Meta:
        ordering = ['-created']

    builds = models.ManyToManyField(Build)
    note = models.TextField(blank=True)
    status = models.ForeignKey(ReleaseStatus, blank=True, null=True)
    created = models.DateTimeField(default=datetime.now)

    def __unicode__(self):
        return unicode(self.id)

My restful version:

$ pip freeze | grep framework
djangorestframework==3.2.3

Shouldn't this be a == rather than a in:

{% if select.value in field.value %}

https://github.com/tomchristie/django-rest-framework/blob/f601c6c1c36a3450f4047b10d3b0955a511080a0/rest_framework/templates/rest_framework/inline/select_multiple.html#L18

http://postimg.org/image/unui36otn/