Modifying spatial widget formsets on Django admin

Question

I am using a TabularInline to reorganize some models in the Django 1.6 admin. I'm running into difficulty when I try to overwrite the default form that is being used. I've read the relevant portion of the docs here. Using formfield_overrides I've tried to change a form using this:

formfield_overrides = {
    models.PointField: {'widget': Textarea},
}

I am subclassing the admin.ModelAdmin using the following approach:

class DirectAdmin(admin.ModelAdmin):

    def get_inline_instances(self, request, obj=None):

        overrides = {
            models.PointField: {'widget': Textarea},
        }

        for inline in self.inlines:
            inline.formfield_overrides = overrides
            return inline(self.model, self.admin_site)

However, when I try this approach, I get the following error:

TypeError: zip argument #2 must support iteration

When I drop into this loop I can see that inline.formfield_overrides does exist as an empty dict, but I don't know what the correct values should be. Is this the correct approach? Is there any other way to modify these widgets when models are grouped using TabularInline?

Answer 1

Normally you should use formfield_overrides property in TabularInline or StackableInline defenition.

For example:

from django.contrib import admin
from myapp.models import City, Shop

class ShopInline(admin.TabularInline):
    formfield_overrides = {
        models.PointField: {'widget': Textarea},
    }
    model = Shop

class CityAdmin(admin.ModelAdmin):
    inlines = [ShopInline,]

But If you want set widget for all inlines:

class DirectAdmin(admin.ModelAdmin):

def get_inline_instances(self, request, obj=None):

    overrides = {
        models.PointField: {'widget': Textarea},
    }
    inline_instances = super(DirectAdmin, self).get_inline_instances(request, obj=obj)
    for inline in inline_instances:
        inline.formfield_overrides = overrides
    return inline_instances

For better understanding please inspect get_inline_instance definition