How do I get the actual object id in a Django admin page (inside formfield_for_foreignkey)?

Question

I \'ve already solved the problem of getting the object id being edited using this code:

class CompanyUserInline(admin.StackedInline):
    \"\"\"
    Defines         


        

Answer 1

A more general approach could be writing an helper method to obtain the model instance (if any), much as you normally do with a (bounded) ModelForm, and from that retrieve the id or any other property:

from django.contrib import admin

class MyModelAdmin(admin.ModelAdmin):

    def get_instance(self, request):
        try:
            object_id = request.resolver_match.kwargs['object_id']
            obj = self.get_object(request, object_id)
        except:
            obj = None
        return obj

Answer 2

The following code snippet will give you the object id:

request.resolver_match.kwargs['object_id']

Sample usage: (I'm filtering the phone numbers shown, to only show customer's phone numbers)

def formfield_for_foreignkey(self, db_field, request, **kwargs):
    if db_field.name == 'preferred_contact_number':
        kwargs['queryset'] = CustomerPhone.objects.filter(customer__pk=request.resolver_match.kwargs['object_id'])
    return super().formfield_for_foreignkey(db_field, request, **kwargs)

P.S: Found it by debugging and walking through accessible variables.

Answer 3

I made it work by creating a property() in model.py that returns the ID

models.py:

class MyModel(models.Model):
    myfield = models.CharField(max_length=75)
    ...
    def get_id(self):
        return str(self.id)
    getid = property(get_id)

admin.py:

from myapp.models import MyModel

class MyModelAdmin(admin.ModelAdmin):
    list_display = ['mylink',]
    def mylink(self, object):
        return '<a href="http://mywebsite/'+object.getid+'/">Edit</a>'
    mylink.allow_tags = True

admin.site.register(MyModel, MyModelAdmin)

Answer 4

As far as i know it is not possible to access the current instance through the formfield_for_...-methods, because they will only be called for a single field instance!

A better point to hook into this logic where you can access the whole instance/form would be get_form. You can also overwrite a form field's queryset there!

Answer 5

I made it work by rewrite change_view()

class CartAdmin(admin.ModelAdmin):

def change_view(self, request, object_id, form_url='', extra_context=None):
    self.object_id = object_id
    return self.changeform_view(request, object_id, form_url, extra_context)


def formfield_for_foreignkey(self, db_field, request, **kwargs):
    print self.object_id
    return super(CartAdmin, self).formfield_for_foreignkey(db_field, request, **kwargs)

then you can call self.object_id inside formfield_for_foreignkey()

Answer 6

I was dealing with a similar situation, and realized that the id that that I needed from the request, I could from from the model it self since it was a foreign key to that model. So it would be something like:

cpu = CompanyUser.objects.filter(company__id=self.company_id)

or what ever the structure of your model dictates.