django_select2 - limit the returned text to a specific field in module

问题

I am using django_select2 in my application. I would like to search and display only according to one field of a model.

models.py:

class Venue(models.Model):
    venue_name = models.CharField(max_length=50)
    venue_city = models.CharField(max_length=50)
    venue_country = models.CharField(max_length=50)

    def __str__(self):
        return f"{self.venue_name}, {self.venue_city}, {self.venue_country}"

forms.py:

from django import forms
from .models import 
from django_select2 import forms as s2forms

class VenueForm(forms.ModelForm):
    class Meta:
        model = Venue
        fields = ['venue_name', 'venue_city', 'venue_country']
        widgets = {
            'venue_city': s2forms.ModelSelect2Widget(model=Venue,
                                            search_fields=['venue_city__icontains']),
            'venue_country': s2forms.ModelSelect2Widget(model=Venue,
                                            search_fields=['venue_country__icontains']),
                        }

The above code successfully filter by venue_city field. Nevertheless, it returns the whole __str__(self). How can I make it to return only the city and country fields, so that users will see only the city or country from the dropdown list of the respective <input>s?

I need to customise only this specific instance of the widget, because I'm using the full returned string of __str__(self) somewhere else.

An idea

Is creating extra models like so:

class VenueCity(models.Model):
    venue_name = models.OneToOneField(Venue, on_delete=models.SET_NULL, null=True)

    def __str__(self):
        return str(self.venue_name__venue_city) #how do I return only the name?

which I'll then use in my widget a possible solution?

来源：https://stackoverflow.com/questions/61699422/django-select2-limit-the-returned-text-to-a-specific-field-in-module