提交表单后，Django httpresponse不起作用

Question

I want to submit the form and return to topics page, but it doesn't work. Here is the page before submitting. page before submit

I enter something and click the button, it doesn't return to the page I want.The error shows as follow: error page

It seems like the views.py can't find the right URL, how can I fix it?

view.py :

def new_topic(request):
    if request.method != "POST":
        form = TopicForm()
    else:
        form = TopicForm(request.POST)
        if form.is_valid():
            form.save()
            return HttpResponseRedirect(reverse('leraning_log:topics'))

    context = {'form':form}     
    return render(request,'learning_logs/new_topic.html',context)

urls.py :

urlpatterns = [

    url(r'^topics/$',views.topics,name='topics'),

    url(r'^topics/(?P<topic_id>\d+)/$',views.topic,name='topic'),

    url(r'^new_topic/$',views.new_topic,name='new_topic'),
]

new_topic.html :

{% extends "learning_logs/base.html" %}

{% block content %}
  <p>Add a new topic:</p>

  <form action="{% url 'learning_logs:new_topic' %} method='post'>
    {% csrf_token %}
    {{form.as_p }}
    <button name="submit">add topic</button>
  </form>
{% endblock content %}

Answer 1

The problem is in your form, just delete the action:

 <form method='post'>#instead of
 <form action="{% url 'learning_logs:new_topic' %}" method='post'>

if you omit the action automatically return to the same page, also, a better practice in your view would be:

def new_topic(request):
    if request.method = "POST":
        form = TopicForm(request.POST)
        if form.is_valid():
            form.save()
            return HttpResponseRedirect(reverse('leraning_log:topics'))

    else:
        form = TopicForm()

    context = {'form':form}     
    return render(request,'learning_logs/new_topic.html',context)