Editing a blog post via the widget_tweaks form?

Question

Django

There is a blog entry that you can create, edit and delete.
The creation goes like this:

url(r'^post/new/$', views.post_new, name='post_new'),

def post_new(request):
  if request.method == "POST":
    form = PostForm(request.POST, request.FILES)
    if form.is_valid():
      post = form.save(commit=False)
      post.published_date = timezone.now()
      post.save()
      return redirect('/', pk=post.pk)
  else:
    form = PostForm(request.POST, request.FILES)
    return render(request, 'blog/post_edit.html', {'form': form})

{% load widget_tweaks %}

{% block content %}

 

<h2>Новий пост</h2>

  <div class="col-md-12 col-lg-8 main-content">
            <form method="POST" enctype="multipart/form-data">{% csrf_token %}
                  <div class="row">
                    <div class="col-md-4 form-group">
                      
                      {% render_field form.title type="text" id="name" class="form-control " title="Заголовок" %}
                      
                      </div>
                    
                  </div>





                  <div class="row">
                    <div class="col-md-12 form-group">
                      {% render_field form.text name="message" id="message" class="form-control " %}
                       
                  </div>
                  </div>

                  <div class="row">
                    <div class="col-md-12 form-group">

                  {% render_field form.image %}

                  </div>
                  </div>

                  <div class="row">
                    <div class="col-md-6 form-group">
                      <input type="submit" value="Опубликовать" class="btn btn-primary">
                    </div>
                  </div>
                </form>
</div>



{% endblock %}

I want that when editing the form, the necessary fields are already inserted, an example from the django girls blog

Editing goes like this:

url(r'^post/(?P<pk>[0-9]+)/edit/$', views.post_edit, name='post_edit'),

def post_edit(request, pk):

    post = get_object_or_404(Post, pk=pk)
    if request.method == "POST":
        form = PostForm(request.POST,  request.FILES, instance=post)
        if form.is_valid():
            post = form.save(commit=False)
            post.published_date = timezone.now()
            post.save()
            return redirect('/', pk=post.pk)
    else:
        form = PostForm(request.POST, request.FILES, instance=post)
    return render(request, 'blog/post_edit.html', {'form': form})

When I made the form not through widget_tweaks everything worked, now only the picture is visible

How to solve the problem?