Django 管理列表视图阻止选择查找

Question

class CustomerChoices(object):
    def expensive_lookup(self):
        ....

    def __iter__(self):
        yield from [(a.number, a.display) for a in self.expensive_lookup()]


class CustomerProfile(models.Model):
    account_number = models.IntegerField(unique=True, choices=CustomerChoices())
    ...

from django.contrib import admin
from .models import CustomerProfile


@admin.register(CustomerProfile)
class CustomerProfileAdmin(admin.ModelAdmin):
    list_display = ('account_number', ...)

Given above code, while I am happy with the add/edit admin to use the choices, how do I prevent django admin list view using the choices, so it doesn't make an expensive lookup? Please note that I am aware of caching methods, but what if I just want to display the account number?

Answer 1

Issue

When you put list_display = ('account_number', ...) in the model admin, Django fetching the "display value" by evaluating the choice iterable, and note that this "display value" doesn't belong to the database and hence the choice evaluation is a must-do thing.

Solutions

You have two choices,

1. Display the stored value from the database
2. Keep things the same as before

For the first solution, you can define custom callable list methods as

@admin.register(CustomerProfile)
class CustomerProfileAdmin(admin.ModelAdmin):
    list_display = (,)

    

Answer 2

JPG's answer seems OK for text or numbers.

But for booleans the value shown as result are "True" and "False" instead of images usually shown by Django.