Auto Complete in Django Admin

admin.py

class BlockAdmin(NoLookupsForeignKeyAutocompleteAdmin, admin.ModelAdmin):
    …
    related_search_fields = {
        'city' : ('name', 'state__name', ),
    }

models.py

class State(models.Model):
    name = models.CharField(max_length = 15)
 
class City(models.Model):
    state = models.ForeignKey(State)
    name  = models.CharField(max_length = 15)
 
class Block(models.Model):
    city  = models.ForeignKey(City)
    block = models.CharField(max_length = 15)

pip

pip install -e git+https://github.com/jeremyjbowers/django-autocomplete.git#egg=autocomplete