python - last record in django models database -

i trying this:

i have table of rating records of locations. in table, 1 location can have multiple rating scores. want restrict search last record of same locations. example:

one location id=1 has 3 rating scores: 1, 2, 4. when user searchs rating score 2, location should not appear, because last record 4.

edit
there 2 tables(django models): location , rating.

can this:

all_locations = location.objects.all() 

then in template. locations_rating related_name foreignkey locationid in rating table.

{% location in all_locations %}   {{ location.locations_rating }} {% endfor %} 

models.py

class location(models.model):     locationname = models.charfield(max_length=100)      def __unicode__(self):         return self.locationname      def latest(self):         return rating.objects.values('rating').filter(von_location=self).order_by('-id')[0]  class rating(models.model):    von_location = models.foreignkey(location,related_name="locations_rate")    rating = models.integerfield()     def __unicode__(self):         return "{0}".format(self.rating) 

views.py

all_locs = location.objects.all() 

template

{% location in all_locs %}    {{ location.locationname }} - {{ location.latest.rating }}<br/> {% endfor %}