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bur
Asked: 2025-04-02 21:30:09 +0800 CST

通过 ManyToMany：ForeignKey 未在管理员中显示

  • 772

我有一个ManyToManyField使用through：

class Entity(models.Model):
    relationships = models.ManyToManyField('self', through='ThroughRelationship', blank=True)
        
class ThroughRelationship(models.Model):
    entity = models.ForeignKey(Entity, on_delete=models.CASCADE)
    name = models.CharField()

我正在将其添加到管理员像这样：

class ThroughRelationshipInline(admin.TabularInline):
    model = ThroughRelationship
    extra = 3

@admin.register(Entity)
class EntityAdmin(admin.ModelAdmin):
    inlines = [ThroughRelationshipInline]

但是，在管理面板中，只name显示字段，我无法选择entity。我该如何解决这个问题？

django

1 个回答

  1. Best Answer

    没有ThroughRelationShip多大意义。即使你有一个ManyToManyField到同一个模型的，它也应该意味着两个 ForeignKey，因为ThroughRelationShip本质上是一个将两个实体链接在一起的“连接表”，所以：

    class Entity(models.Model):
    relationships = models.ManyToManyField('self', through='ThroughRelationship', blank=True)
        
class ThroughRelationship(models.Model):
    entity_from = models.ForeignKey(Entity, on_delete=models.CASCADE, related_name='relations_by_from')
    entity_to = models.ForeignKey(Entity, on_delete=models.CASCADE, related_name='relations_by_to')
    name = models.CharField()

    然后使用：

    class ThroughRelationshipInline(admin.TabularInline):
    model = ThroughRelationship
    extra = 3
    fk_name = 'entity_from'

@admin.register(Entity)
class EntityAdmin(admin.ModelAdmin):
    inlines = [ThroughRelationshipInline]
    • 1

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