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Geocoding an address when submitting a form?

Trying to wrap my head around django forms and django's way of doing things. I want to create a basic web form that allows a user to enter an address and have that address geocoded and stored in the database.

I created a location model:

class Location(models.Model): address = models.CharField(max_length=200) city = models.CharField(max_length=100) state = models.CharField(max_length=100, null=True) postal_code = models.CharField(max_length=100, null=True) country = models.CharField(max_length=100) latitude = models.DecimalField(max_digits=18, decimal_places=10, null=True) longitude = models.DecimalField(max_digits=18, decimal_places=10, null=True)

And defined the form:

 class LocationForm(forms.ModelForm): class Meta: model = models.Location exclude = ('latitude','longitude')

In my opinion, I use form.save() to save the form. This works and stores the address in the database.

I created a module for geocoding an address. I'm not sure what the way to do something is django, but, in my opinion, before I save the form, I need to geocode the address and set lat and long. How to set latitude and longitude before saving?

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python django django-forms geocoding
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5 answers

You can override the save method of the model. I geocode data before saving. This is the use of googleapi, but it can be changed accordingly.

 import urllib def save(self): location = "%s, %s, %s, %s" % (self.address, self.city, self.state, self.zip) if not self.latitude or not self.longitude: latlng = self.geocode(location) latlng = latlng.split(',') self.latitude = latlng[0] self.longitude = latlng[1] super(Marker, self).save() def geocode(self, location): output = "csv" location = urllib.quote_plus(location) request = "http://maps.google.com/maps/geo?q=%s&output=%s&key=%s" % (location, output, settings.GOOGLE_API_KEY) data = urllib.urlopen(request).read() dlist = data.split(',') if dlist[0] == '200': return "%s,%s" % (dlist[2], dlist[3]) else: return ','
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Update for the Google Maps API v3:

 import json import urllib.parse, from decimal import Decimal def save(self): if not self.lat or not self.lng: self.lat, self.lng = self.geocode(self.address) super(Location, self).save() def geocode(self, address): address = urllib.parse.quote_plus(address) maps_api_url = "?".join([ "http://maps.googleapis.com/maps/api/geocode/json", urllib.parse.urlencode({"address"=address, "sensor"=False}) ]) response = urllib.urlopen(maps_api_url) data = json.loads(response.read().decode('utf8')) if data['status'] == 'OK': lat = data['results'][0]['geometry']['location']['lat'] lng = data['results'][0]['geometry']['location']['lng'] return Decimal(lat), Decimal(lng)
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You can also use django.db.models.signals.pre_save -signal!

Take a look at the Django protocol documentation at http://docs.djangoproject.com/en/dev/topics/signals/ .

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I do the same as it can be yew looking for something like a strong message

 # forms.py from django.contrib.gis.utils import GeoIP class registerForm(forms.ModelForm): class Meta: model=register fields = ('Availability', 'Status') def save(self,ip_address, *args, **kwargs): g = GeoIP() lat, lon = g.lat_lon(ip_address) user_location = super(registerForm, self).save(commit=False) user_location.latitude = lat user_location.longitude = lon user_location.save(*args, **kwargs)

and my views

  #views.py if request.method == "POST": ip_address=request.META['REMOTE_ADDR'] rform = registerForm(data = request.POST) if rform.is_valid(): register = rform.save(commit=False) register.user=request.user register.save(ip_address) return render_to_response('home.html') else: rform = registerForm() return render_to_response('status_set.html',{'rform':rform})
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Like other answers:

 def geocode(address, city, state, zip_code): try: location_param = urllib.request.quote("%s, %s, %s, %s" % (address, city, state, zip_code)) url_request = "http://maps.googleapis.com/maps/api/geocode/json?address=%s&sensor=false" % location_param result = requests.get(url_request) data = result.json() location = data['results'][0]['geometry']['location'] lat = location['lat'] lng = location['lng'] return lat, lng except Exception: return None
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