Django消息在管理model_save()中不起作用

MESSAGE_STORAGE = 'django.contrib.messages.storage.session.SessionStorage'

from django.contrib import messages

def model_save(request):
    # 保存模型的逻辑
    messages.success(request, '保存成功')

from django.contrib import messages
from django.shortcuts import render

def my_view(request):
    model_save(request)
    messages = messages.get_messages(request)
    return render(request, 'my_template.html', {'messages': messages})

{% for message in messages %}
    <div class="alert alert-{{ message.tags }}">
        {{ message }}
    </div>
{% endfor %}