GIS widgets don't initialize properly after clicking "Add another" in admin inlines

[Lars Solberg]

My goal is to use a field that looks like this:

from django.contrib.gis.db import models

class FavoriteLocation(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    location = models.PointField()

as an extra field on a User. The field-type works on other models, so everything is setup correctly.

However, getting it as a inline is problematic because it doesnt render correctly in the admin.
The admin code looks like this:

from django.contrib.auth.admin import UserAdmin
from django.contrib.gis import admin

class FavoriteLocationInline(admin.StackedInline):
    model = FavoriteLocation
    extra = 1

class CustomUserAdmin(UserAdmin):
    inlines = (FavoriteLocationInline,)

admin.site.unregister(User)
admin.site.register(User, CustomUserAdmin)

however, the widget for displaying the field looks blank (see screenshot).

In the doc, It sais I should use "admin.OSMGeoAdmin" for my admin class. However, that don't change anything.
Nor changing it to "class CustomUserAdmin(admin.OSMGeoAdmin, UserAdmin).

If I click add "another favorite location", I will also get a text-area field instead of the widget.

Trying to save the model with this broken widget gives me a "GDALException" (django.contrib.gis.gdal.error.GDALException: OGR failure.)
Note that this widget works on other admin-pages I have..

Also note that the broken widget is black because it is all zoomed in on 0, 0.. However, it also misses some elements in the upper right corner.
I am seeing no errors in the browser console.

[Lars Solberg]

broken widget

[Lars Solberg]

info about broken widget

[Lars Solberg]

top of working widget

[Tim Graham]

I think you should try inheriting from OSMGeoAdmin rather than UserAdmin. You'll have to copy the parts of UserAdmin that you want into your subclass, I imagine. I imagine this use case isn't too common and I'm not sure if there's anything Django could do to make it easier.

This looks more like a usage question than a bug in Django, but if you have some idea about what could be done, feel free to let us know.

[Lars Solberg]

I still coulnt get it to work.

I tried using one I have working as an inline, then the inlined version stopped working as well.
So this happens when I am using inlines..

The html to render the widgets are wastly different..

• Inlined version @ ​https://gist.github.com/xeor/968ad1c597c59c432b4a3588b87f2178
• Normal version @ ​https://gist.github.com/xeor/84a374d57b89adeef5b37513b4409667

In this case, I have taken out the useradmin part, and have made a normal admin interface..

from django.contrib.gis import admin
from .models import Other, Spot

class SpotInline(admin.StackedInline):
    model = Spot
    extra = 1

class OtherAdmin(admin.OSMGeoAdmin):
    inlines = (SpotInline,)

admin.site.register(Other, OtherAdmin)

OtherAdmin now has the map as a normal widget (works), and one as an inline (doesnt work).

I can see in eg ​https://github.com/django/django/blob/master/django/contrib/gis/templates/gis/admin/openlayers.html that there are some references around to example {{ id }}_map.. Will id be correct when this is using an inline?

[Tim Graham]

It's possible that inline GIS widgets are broken. I'm not sure if the Django tests cover that. Can you put together a small sample project that reproduces the issue? You could also check with if it works with older versions (2.0.x, 1.11.x, etc.) of Django.

[Tim Graham]

Using the attached sample project, I can reproduce the problem that clicking "Add another City" on the admin's state change form doesn't initialize the new widget properly (textarea instead of the openlayers widget). It doesn't seem to be a new issue -- I reproduced back as far as I tested (Django 1.11).

I'm not sure if the "missing elements in the upper right corner" part of this report is valid... when using PointField in a non-inline admin, those elements don't appear either. Are they not applicable to PointField? In any case, a bug report should be limited to one issue so let's keep this ticket limited to the "Add another" initialization and open addition tickets if more issues remain.

[Tim Graham]

sample app to reproduce

[Mariusz Felisiak]

​PR

[Mariusz Felisiak]

GISModelAdmin is also affected.

[Claude Paroz]

New ​PR

[Claude Paroz]

I think it would be better to wait for #25706 before finishing this one.