Question

我遇到了这样的问题：我想限制内联模型管理员中的外键选择，但我想根据此内联对象中指定的某些值来执行此操作。

如何在InlineModelAdmin方法中访问内联对象（不是父对象）（特别是在formfield_for_foreignkey(self, db_field, request, **kwargs)中）？

Answer 1

您无法访问任何InlineModelAdmin方法中的内联对象。

唯一的方法是使用自定义ModelForm，该模型在初始化时会收到instance。请注意，extra表单用于创建新的内联对象接收和“空” instance（pk =无）。

from django.forms import ModelForm
from django.contrib.admin import ModelAdmin, TabularInline

class QuestionForm(ModelForm):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        if self.instance.pk:
            # do what you want with inline object instance

    class Meta:
        model = Question
        fields = "__all__"

class QuestionInline(TabularInline):
    model = Question
    form = QuestionForm

class CategoryAdmin(ModelAdmin):
    model = Category
    inlines = [QuestionInline]

Answer 2

这对你有用。使用适当的值更改“YourModelAdmin”，“target_field”，“your_custom_condition”和“...”。

def formfield_for_foreignkey(self, db_field, request=None, **kwargs):
    field = super(YourModelAdmin, self).formfield_for_foreignkey(db_field, request, **kwargs)
    if db_field.name == 'target_field':
        if request and your_custom_condition:
            field.queryset = field.queryset.filter(...)
    return field

以InlineModelAdmin形式访问内联对象

2 个答案: