class TeacherAdmin(admin.ModelAdmin):
    def has_add_permission(self, request):
        return True
    def has_change_permission(self, request, obj=None):
        return True
    def has_module_permission(self, request):
        return True

has_module_permission检查模型是否可以在应用标签表中列出

has_module_permission checks if the model can be listed in the app labels table