CODEWITHSUNDEEP
djangodjango-formsgeolocationgeodjango
art_cs
art_cs

Reputation: 791

how to provide default pointfield value to user location using geolocation API , could not convert string to float:

I'm new to geodjango i want to make real-world gis project with geodjango to find locations I tried this 

class Place(models.Model):
    user= models.ForeignKey(Account,on_delete=models.CASCADE)
    address = models.CharField(max_length=100)
    slug = models.SlugField(unique=True,blank=True,null=True)
    description = models.TextField()
    location = models.PointField(srid=4326)

views.py

class PalceCreateView(CreateView):
    queryset = Place.objects.all()
    def form_valid(self,form):
       lat = self.request.POST['lat']
       lon = self.request.POST['long']
       coords = Point(lat,lon)
       form.instance.location = coords
       form.save()
       return super(PalceCreateView,self).form_valid(form)

my forms.py

class PlaceForm(forms.ModelForm):
    class Meta:
       model = Place
       fields = [
          'name','description','location','city','tags'
       ]
       read_only_fields = ['location']

my template

 <form enctype="multipart/form-data" method="post">
        {% csrf_token %}
        <input type="hidden" name="lat" id="lat">
        <input type="hidden" name="long" id="long">

        {{form}}
        <input type='submit' value='submit'>      
</form>
<script>
  navigator.geolocation.getCurrentPosition(function(location) {
    lat = location.coords.latitude;
    long = location.coords.longitude;
    document.getElementById('lat').innerHTML= lat
    document.getElementById('long').innerHTML = long
});
</script>

but when I submit the form it will raise this error

Invalid parameters given for Point initialization.

How can I assign it to a location field?

Upvotes: 3

Views: 1151

Answers (2)

John Moutafis
John Moutafis

Reputation: 23134

You want to prevent the user from modifying the initial point and you want to add a second field for a potential point input.

You can achieve this by adding an extra form.PointField directly into the form definition:

from django.contrib.gis import forms

class PlaceForm(forms.ModelForm):
    new_location = forms.PointField()

    class Meta:
       model = Place
       fields = [
          'name','description','location','city','tags', 'new_location'
       ]
       read_only_fields = ['location']

then in your view:

class PalceCreateView(CreateView):
    queryset = Place.objects.all()
    def form_valid(self,form):
       new_location = self.request.POST['new_location']
       form.instance.location = new_location
       form.save()
       return super(PalceCreateView,self).form_valid(form)

Or you can modify your existing solution (lat, long as a couple of form.FloatField]2s) as follows:

class PlaceForm(forms.ModelForm):
    lat = forms.FloatField()
    long = forms.FloatField()

    class Meta:
       model = Place
       fields = [
          'name','description','location','city','tags', 'lat', 'long'
       ]
       read_only_fields = ['location']

and your view remains the same.

Upvotes: 1

art_cs
art_cs

Reputation: 791

fixed just by using changing the coordinated to float type

def form_valid(self,form):
    lat = float(self.request.POST.get('lon'))
    lon = float(self.request.POST.get('lat'))

Upvotes: 2

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