在django管理中显示来自不同模型的相关字段

from django.db import models

class A(models.Model):
    field1 = models.CharField(max_length=100)
    field2 = models.IntegerField()

class B(models.Model):
    a = models.ForeignKey(A, on_delete=models.CASCADE)
    field3 = models.CharField(max_length=100)

# admin.py
from django.contrib import admin

class BAdmin(admin.ModelAdmin):
    list_display = ('field3', 'a_field1', 'a_field2')

    def a_field1(self, obj):
        return obj.a.field1

    a_field1.short_description = 'Field 1 from A'

    def a_field2(self, obj):
        return obj.a.field2

    a_field2.short_description = 'Field 2 from A'

admin.site.register(B, BAdmin)

from django.db import models

class A(models.Model):
    field1 = models.CharField(max_length=100)
    field2 = models.IntegerField()

class B(models.Model):
    field3 = models.CharField(max_length=100)
    a = models.ManyToManyField(A, through='AB')

class AB(models.Model):
    a = models.ForeignKey(A, on_delete=models.CASCADE)
    b = models.ForeignKey(B, on_delete=models.CASCADE)

# admin.py
from django.contrib import admin

class ABInline(admin.TabularInline):
    model = AB

class BAdmin(admin.ModelAdmin):
    list_display = ('field3', 'a_field1', 'a_field2')
    inlines = [ABInline]

    def a_field1(self, obj):
        return obj.a.field1

    a_field1.short_description = 'Field 1 from A'

    def a_field2(self, obj):
        return obj.a.field2

    a_field2.short_description = 'Field 2 from A'

admin.site.register(B, BAdmin)

from django.db import models

class A(models.Model):
    field1 = models.CharField(max_length=100)
    field2 = models.IntegerField()

class B(models.Model):
    field3 = models.CharField(max_length=100)

    def a_field1(self):
        return A.objects.get(b=self).field1

    a_field1.short_description = 'Field 1 from A'

    def a_field2(self):
        return A.objects.get(b=self).field2

    a_field2.short_description = 'Field 2 from A'

# admin.py
from django.contrib import admin

class BAdmin(admin.ModelAdmin):
    list_display = ('field3', 'a_field1', 'a_field2')

admin.site.register(B, BAdmin)