title: RemovedInDjango18Warning: Creating a ModelForm without either the 'fields' attribute or the 'exclude' attribute is deprecated
body: <p>I am doing a Django project and when I tried to access 127.0.0.1:8000/articles/create, I got the following error in my Ubuntu terminal: </p>
  
  <pre><code>/home/(my name)/django_test/article/forms.py:4: RemovedInDjango18Warning:  Creating a ModelForm without either the 'fields' attribute or the 'exclude' attribute is deprecated - form ArticleForm needs updating
  class ArticleForm(forms.ModelForm):
  </code></pre>
  
  <p>In addition, I also got the following error when visiting my actual localhost site: </p>
  
  <pre><code>ValueError at /articles/create/
  
  The view article.views.create didn't return an HttpResponse object. It returned None instead.
  </code></pre>
  
  <p>Here is my forms.py file: </p>
  
  <pre><code>from django import forms
  from models import Article
  
  class ArticleForm(forms.ModelForm):
  
      class Meta:
          model = Article 
  </code></pre>
  
  <p>And here is my views.py file: </p>
  
  <pre><code>from django.shortcuts import render_to_response
  from article.models import Article
  from django.http import HttpResponse
  from forms import ArticleForm
  from django.http import HttpResponseRedirect
  from django.core.context_processors import csrf
  
  #import pdb; pdb.set_trace()
  # Create your views here.
  
  def articles(request):
      language = 'en-us'
      session_language = 'en-us'
  
      if 'lang' in request.COOKIES:
          language = request.COOKIES['lang']
      if 'lang' in request.session:
          session_language = request.session['lang']
  
      return render_to_response('articles.html',  
                            {'articles':
                             Article.objects.all(), 'language' : language, 
                             'session_language' : session_language})
  
  def article(request, article_id=1):
      return render_to_response('article.html', {'article': 
                                              Article.objects.get(id=article_id) })
  
  def language(request, language='en-us'):
      response = HttpResponse("setting language to %s" % 
                          language)
  
      response.set_cookie('lang', language)
      response.session['lang'] = language
  
      return response
  
  def create(request):
      if request.POST:
          form = ArticleForm(request.POST)
          if form.is_valid():
              form.save()
  
              return HttpResponseRedirect('/articles/all')
  
          else:
              form = ArticleForm()
  
          args = {}
          args.update(csrf(request))
  
          args['form'] = form 
  
          return render_to_response('create_article.html', args)
  </code></pre>
  
  <p>I'm not sure how to fix this problem. I looked at the Django documentation but I couldn't find a solution to my problem so any help would be appreciated.</p>