Question

我有一个小问题。例如，我有以下视图：

def post_create(request):
    form = PostForm(request.POST or None)
    if form.is_valid():
        instance = form.save(commit=False)
        instance.save()
        # message success
        messages.success(request, "Successfully Created")
        return HttpResponseRedirect(instance.get_absolute_url())
    else:
        messages.error(request, "Not Successfully Created")
    context = {
        "form": form,
        }
    return render(request, "post_form.html", context)

主要问题：重定向后，我同时收到了两条消息（如果同时出现）。为什么？

解决方案是：

... ...
    return HttpResponseRedirect(instance.get_absolute_url())
elif form.errors:
    messages.error(request, "Not Successfully Created")
context = {
   "form": form,
   }
return render(request, "post_form.html", context)

但是为什么我在成功验证后重定向（第一种变体）时会看到两条消息？

base.html：

{% load staticfiles %}
<!--DOCTYPE html -->
<html>
<head>
    <title></title>

    <link rel='stylesheet' href='{% static "css/base.css" %}' />
    <style>
        {% block style %}{% endblock style %}
    </style>
</head>
<body>
    {% include "messages_display.html" %}
    <div class='container'>
        {% block content %}{% endblock content %}
    </div>
    </body>
</html>

messages_display.html：

 {% if messages %}
    <div class='messages'>

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

    </div>
{% endif %}

post_form.html：

{% extends "base.html" %}


{% block content %}
<div class='col-sm-6 col-sm-offset-3'>
<h1>Form</h1>

<form method='POST' action=''>{% csrf_token %}
{{ form.as_p }}
<input type='submit' class='btn btn-default' value='Create Post' />
</form>
</div>
{% endblock content %}

Django如何验证表格？

0 个答案: