django谷歌地图

from django.db import models
from django_google_maps import fields as map_fields

class Rental(models.Model):
    address = map_fields.AddressField(max_length=200)
    geolocation = map_fields.GeoLocationField(max_length=200)

和我的admin.py：

from django.contrib import admin
from django_google_maps import widgets as map_widgets
from django_google_maps import fields as map_fields
from .models import Rental

class RentalAdmin(admin.ModelAdmin):
    formfield_overrides = {
        map_fields.AddressField: {'widget': map_widgets.GoogleMapsAddressWidget},}
admin.site.register(Rental,RentalAdmin)

但是当我在管理界面中点击地图时,字段仍为空.
我用这个指南安装它https://github.com/madisona/django-google-maps

2.我试图通过本指南http://pypi.python.org/pypi/django-easy-maps使用easy-map,但我无法在管理界面中看到地址预览.
我的admin.py是：

from django import forms
from django.contrib import admin
from easy_maps.widgets import AddressWithMapWidget
from .models import Address

class AddressAdmin(admin.ModelAdmin):
    class form(forms.ModelForm):
        class Meta:
            widgets = {
                'address': AddressWithMapWidget({'class': 'vTextField'})
            }

admin.site.register(Address,AddressAdmin)