在django admin中过滤外键字段

Question

我有这些模型:

class Entity(models.Model):
       name=models.CharField(max_length=100)

class Theme(models.Model):
   name=models.CharField(max_length=100)
   entity=models.OneToOneField(Entity)

class Company(models.Model):
    name=models.CharField(max_length=100)
    theme=models.OneToOneField(Theme,null=True,blank=True)

我想在管理员中添加公司时过滤主题字段,有些事情是这样的:

class CompanyAdmin(admin.ModelAdmin):
   def queryset(self, request):
      qs = super(CompanyAdmin, self).queryset(request)
      qs.theme.queryset = Theme.objects.filter(name__iexact='company')
      return qs

admin.site.register(Company,CompanyAdmin)

我尝试过很多东西,但没有人工作过!我怎么能这样做？

Answer 1

使用render_change_form方法:

class CompanyAdmin(admin.ModelAdmin):
    def render_change_form(self, request, context, *args, **kwargs):
         context['adminform'].form.fields['theme'].queryset = Theme.objects.filter(name__iexact='company')
         return super(CompanyAdmin, self).render_change_form(request, context, *args, **kwargs)

Answer 2

我其实更喜欢get_form这样做:

class CompanyAdmin(admin.ModelAdmin):
    def get_form(self, request, obj=None, **kwargs):
        form = super(CompanyAdmin, self).get_form(request, obj, **kwargs)
        form.fields['theme'].queryset = Theme.objects.filter(name__iexact='company')
        return form

Answer 3

看这里http://books.agiliq.com/projects/django-admin-cookbook/en/latest/filter_fk_dropdown.html

@admin.register(Hero)
class HeroAdmin(admin.ModelAdmin, ExportCsvMixin):
    ...
    def formfield_for_foreignkey(self, db_field, request, **kwargs):
        if db_field.name == "category":
            kwargs["queryset"] = Category.objects.filter(name__in=['God', 'Demi God'])
        return super().formfield_for_foreignkey(db_field, request, **kwargs)

Answer 4

在 Django 3 中很容易：

class CompanyAdmin(admin.ModelAdmin):
    list_display = ('name','theme')
    list_filter = ('theme__name',)

admin.site.register(Company,CompanyAdmin)

这将在屏幕右侧显示一个带有主题名称列表的过滤器。