Question

我想使用Google地图在我的django项目中显示多个邮件地址。地址是数据库中的变量。

直到现在，我已经尝试了django-easy-maps，这对于仅显示一个地址非常有用。就像它说的那样，如果你只有一个地址（可能会显示多个地址），它就很容易使用。

我还尝试了django-gmapi，它可以显示多个地址（采用latlng格式）。但我很难将我的美国邮政地址转换为latlng格式。

所以我的问题是：

django-easy-maps是否支持多个地址？
如何将geocoding与django-gmapi
如何在Django的Google地图上显示多个我们的帖子地址？

Answer 1

我可以帮助解决第2点......如何对现有地址进行地理编码。

<强>更新
看起来gmapi内置了自己的地理编码助手，所以你可能不需要我下面粘贴的任何代码。请参阅：Does anybody has experiences with geocoding using django-gmapi?

我使用了以下代码：

import urllib

from django.conf import settings
from django.utils.encoding import smart_str
from django.db.models.signals import pre_save
from django.utils import simplejson as json


def get_lat_long(location):
    output = "csv"
    location = urllib.quote_plus(smart_str(location))
    request = "http://maps.google.co.uk/maps/api/geocode/json?address=%s&sensor=false" % location
    response = urllib.urlopen(request).read()
    data = json.loads(response)
    if data['status'] == 'OK':
        # take first result
        return (str(data['results'][0]['geometry']['location']['lat']), str(data['results'][0]['geometry']['location']['lng']))
    else:
        return (None, None)

def get_geocode(sender, instance, **kwargs):
    tlat, tlon = instance._geocode__target_fields
    if not getattr(instance, tlat) or not getattr(instance, tlon):
        map_query = getattr(instance, instance._geocode__src_field, '')
        if callable(map_query):
            map_query = map_query()
        lat, lon = get_lat_long(map_query)
        setattr(instance, tlat, lat)
        setattr(instance, tlon, lon)

def geocode(model, src_field, target_fields=('lat','lon')):
    # pass src and target field names as strings
    setattr(model, '_geocode__src_field', src_field)
    setattr(model, '_geocode__target_fields', target_fields)
    pre_save.connect(get_geocode, sender=model)

（可能是我从某个地方的Github项目借来的，如果是这样的话，我已经失去了归属地，对不起！）

然后在您的模型上，您需要以下内容：

from django.db import models
from gmaps import geocode # import the function from above

class MyModel(models.Model):
    address = models.TextField(blank=True)
    city = models.CharField(max_length=32, blank=True)
    postcode = models.CharField(max_length=32, blank=True)

    lat = models.DecimalField(max_digits=12, decimal_places=6, verbose_name='latitude', blank=True, null=True, help_text="Will be filled automatically.")
    lon = models.DecimalField(max_digits=12, decimal_places=6, verbose_name='longitude', blank=True, null=True, help_text="Will be filled automatically.")

    def map_query(self):
        """
        Called on save by the geocode decorator which automatically fills the
        lat,lng values. This method returns a string to use as query to gmaps.
        """
        map_query = ''
        if self.address and self.city:
            map_query = '%s, %s' % (self.address, self.city)
        if self.postcode:
            if map_query:
                map_query = '%s, ' % map_query
            map_query = '%s%s' % (map_query, self.postcode)
        return map_query

geocode(Venue, 'map_query')

然后，要对现有数据进行地理编码，您可以重新保存所有现有记录，例如：

from .models import MyModel

for obj in MyModel.objects.all():
    obj.save()

谷歌地图在Django项目中显示多个位置

1 个答案: