Displaying map in admin to add a point and record lat and lon

Django Internals GeoDjango
1

Hi,
I’m working with a legacy database. The models include to fields, lat and lon, that describe the location of my objects. Not all objects have a lat or a lon and the information is not mandatory (blank=True).
In the admin, I’d like to display a small OSM based map in the form, with the possibility for the user to add a point if needed. This point would automatically fill in the lat and lon fields.
Is it possible?
I’ve already declared django.contrib.gis in INSTALLED_APPS, turned my PgSQL base into a PostGIS one and declared postgis and database engine in settings.py.
Thanks for your help!

2

Surely doable. Maybe this stackoverflow post may give you hints on how to proceed, even if it does not contains a GIS part

python - Django: Faking a field in the admin interface? - Stack Overflow.

3

Thanks for the link!

Luckily I found this tutorial that cover exactly my need: Adding GeoDjango to an existing Django project. The trick is to create a new PointField column and to populate it with a custom save() method, described in the tutorial.

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4

Of course, if you are ready to alter the database and add a real point field to your table, that’s another story (and finally easier). But as you mentioned a legacy database, I provided a link to a possible solution without touching the existing database.

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