我在django中有一个模型表单，每当我提交表单时，我都会收到自定义成功消息和默认消息how to suppress the default

from django.contrib import messages

class YourView(FormView):
    form_class = YourForm
    template_name = 'your_template.html'
    
    def form_valid(self, form):
        # 自定义成功消息
        messages.success(self.request, 'Your custom success message.')
        return super().form_valid(form)

from django.contrib import messages

def your_view(request):
    if request.method == 'POST':
        form = YourForm(request.POST)
        if form.is_valid():
            # 自定义成功消息
            messages.success(request, 'Your custom success message.')
            # 处理表单数据...
    else:
        form = YourForm()
    
    return render(request, 'your_template.html', {'form': form})

{% if messages %}
    <ul class="messages">
        {% for message in messages %}
            <li{% if message.tags %} class="{{ message.tags }}"{% endif %}>{{ message }}</li>
        {% endfor %}
    </ul>
{% endif %}