Displaying information from multiple foreign keys in the django admin

I've been having some difficulty pulling information from multiple foreign keys and getting that information to display in the django admin. I have four models: Subject, Study, Procedure, and Event. The first three are foreign keys to the last. I want information from each to display in the admin for Event as such: last_name, first_name, ssn, study_desc, procedure_desc, and event_start_time where last_name, first_name_ and ssn are located in the Subject model, study_desc is located in the Study model, procedure_desc is located in the Procedure model and event_start_time is located in the Event model.

Thus far, I've been able to have the information from the Subject model and the Event model display together through use of a Model Form, but I have been unsuccessful in getting additi开发者_高级运维onal information from the other two models to display with what I have now. Any suggestions, insights, or alternate methods to use would be much appreciated. The form that I used is below.

class EventForm(ModelForm):

    def __init__(self, *args, **kwargs):
    super(EventForm, self).__init__(*args, **kwargs)
    if self.instance:
        self.fields['subject'].queryset = \
            Subject.objects.all().order_by('last_name')

    class Meta:
            model = Event

class EventAdmin(admin.ModelAdmin):
    form = EventForm
    search_fields = ['subject__last_name','subject__first_name','subject__ssn']
    list_display = ['last_name','first_name','ssn','event_start_time']

One option to display information from related objects is to use a callable.

This is exlained in the list_display docs for Django's ModelAdmin.

Also check this question on SO for some detailed examples and discussion.