python - Limiting Fields in Django 1.8 -

i have following models.py

class rockinfo(models.model):     rock_name = models.charfield(max_length=200,default="ac/dc")     rock_img = models.imagefield(upload_to="media/",default="1992/08/92")     rank = models.integerfield(default=0)     = models.charfield(max_length=1000,default="they best")   def __str__(self):                   return self.rock_name  class rockvids(models.model):     rockername = models.foreignkey(rockinfo)     vid_id1 = models.charfield(max_length=200,default="z7jgy9zezj4")     vid_id2 = models.charfield(max_length=200,default="tabgnerero8")  def __str__(self):     return self.vid_id1 

and admin.py

class choiceinline(admin.tabularinline):     model = rockvids     = 10 

this should allow me add 10 instances of vid_id1 , vid_id2 in django admin. is, everytime add 10 fields, , save in django admin, adds 10 more fields(with default values) everytime try edit it.and videos default values displayed. there way restrict 10 values in admin , in template.

class choiceinline(admin.tabularinline): model = rockvids = 10 max_num = 10 

this limits number of instances.