Display multiple polygon on Django admin

Question

I have a model with a gis_models.GeometryField.

class MyModel(django.db.models):
   area = gis_models.GeometryField(null=True, blank=True)

I'm displaying this model on Django admin but i'm using https://github.com/makinacorpus/django-leaflet library.

I already have 100+ rows in the database. when I open the admin page for any of those entries, I'm able to see a polygon being draw. that's perfect! take another case where I have to add a new polygon from the admin page. I am able to draw the map and save the entry. it works as expected. I can see the polygon on the map next time I open that entry on the map.

the problem is when I add a new polygon I don't know what polygons are already there in the DB. so sometimes I add a new polygon that overlaps with existing ones. I was thinking of displaying all the available polygons on the map so that next time I add a new one I won't touch those points on the map. how can we display all the polygons (MultiPolygon) just for the /add/ page?

PS: I couldn't find the method that I can override in Django admin class to render all the polygons. also, I couldn't find the relevant question on StackOverflow or any other source. so please if you think I didn't search enough please point me to the link that you think would be helpful to me for this specific case.

er23 · Accepted Answer · 2020-01-28 08:48:15Z

0

I think this is not the right way. The best solution is to create your own template for viewing your spatial data. Visit for example https://github.com/makinacorpus/django-leaflet. Another solution is to connect your spatial database to a program such as Quantum GIS, and in this way, you can do CRUD operation with your database.

answered Jan 28, 2020 at 8:48

er23

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Francis Odero · Accepted Answer · 2021-10-30 05:22:44Z

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1.Use spatial database (I recommend Postgres with PostGIS extension )

https://www.enterprisedb.com/postgres-tutorials/how-use-postgresql-django

DATABASES = {
    'default': {
        'ENGINE': 'django.contrib.gis.db.backends.postgis',
        'NAME': 'polygon',
        'USER':'postgres',
        'PASSWORD':'*******',
        'HOST':'localhost',
        'PORT':'5432',
    } }

2.Add django.contrib.gis into your installed apps in settings.py

INSTALLED_APPS = [
    .......
    'django.contrib.gis',
    .....
]

create a model

#models.py

 from django.contrib.gis.db import models


 class Polygon(models.Model):
      area=models.MultiPolygonField(srid=4326)

edited Oct 30, 2021 at 5:22

answered Mar 11, 2021 at 6:09

Francis Odero

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