在django admin中过滤下拉列表值

from django import forms
from django.contrib import admin
from .models import MyModel

class MyModelAdmin(admin.ModelAdmin):
    def formfield_for_choice_field(self, db_field, request, **kwargs):
        if db_field.name == 'my_choice_field':
            kwargs['choices'] = MyModel.MY_CHOICES.filter(some_filter=True)
        return super().formfield_for_choice_field(db_field, request, **kwargs)

admin.site.register(MyModel, MyModelAdmin)

from django.contrib import admin
from .models import MyModel

class MyModelAdmin(admin.ModelAdmin):
    def get_field_queryset(self, db, db_field, request):
        if db_field.name == 'my_choice_field':
            return MyModel.objects.filter(some_filter=True)
        return super().get_field_queryset(db, db_field, request)

admin.site.register(MyModel, MyModelAdmin)

from django import forms
from .models import MyModel

class MyModelForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.fields['my_choice_field'].queryset = MyModel.objects.filter(some_filter=True)

    class Meta:
        model = MyModel
        fields = '__all__'

class MyModelAdmin(admin.ModelAdmin):
    form = MyModelForm

admin.site.register(MyModel, MyModelAdmin)