#create_trailer
<div class="create_trailer">
        <form class="create_trailer_form" method="post">
            {% csrf_token %}
            {{ form.name_trailer }}
            {{ form.preview_trailer }}
            {{ form.trailer }}
            {{ form.author }}

            <input id="user_submit" type="submit" value="Создать статью">
        </form>
    </div>
#views.py
def create_trailer(request):
    if request.method == 'POST':
        form = TrailerForm(request.POST)
        if form.is_valid():
            return HttpResponse("Форма валидна!")
        else:
            return HttpResponse("Форма не валидна!")
    else:
        return HttpResponse("Форма не post")
    return render(request, 'polls/create_trailer.html', {'form': form})
#forms.py
class TrailerForm(ModelForm):
    class Meta:
        model = Trailer
        fields = ['name_trailer', 'preview_trailer', 'trailer', 'author']