重写save_model方法时如何防止"已成功更改"消息

Question

我试图让用户在管理员中查看记录但不保存任何内容.所以我想尝试做这样的事情:

def save_model(self, request, obj, form, change):
    """Override save method so no one can save"""
    messages.error(request, "No Changes are permitted from this screen."
        " To edit projects visit the 'Projects' table, and make sure you are"
        " in the group 'Visitor_Program_Managers'.")

这有效但我在下一个屏幕上收到两条消息:

首先是我的消息,然后是"......成功改变了".

如何防止第二条消息？

Answer 1

您可以隐藏某些消息并显示其他消息.在您的情况下,您有兴趣不显示成功消息.您可以执行以下操作:

def save_model(self, request, obj, form, change):
    messages.set_level(request, messages.ERROR)
    messages.error(request, 'No changes are permitted ..')

Answer 2

对于需要以比接受的答案更灵活的方式消除自动 Django 成功消息的任何人，您可以执行以下操作：

from django.contrib import messages, admin

class ExampleAdmin(admin.ModelAdmin):
    def message_user(self, *args):
        pass

    def save_model(self, request, obj, form, change):
        super(ExampleAdmin, self).save_model(request, obj, form, change)
        if obj.status == "OK":
            messages.success(request, "OK!")
        elif obj.status == "NO":
            messages.error(request, "REALLY NOT OK!")