troeger / opensubmit

    receivers_qs = users_qs.order_by('email').distinct().values('first_name', 'last_name', 'email')

    receivers = [receiver for receiver in receivers_qs]

    request.session['mail_receivers'] = receivers

    return render(request, 'mail_form.html', {'receivers': receivers, 'mailform': MailForm()})

@login_required

@staff_member_required

def mail_course(request, course_id):

    course = get_object_or_404(Course, pk=course_id)

    users = User.objects.filter(profile__courses__pk=course.pk)

    if users.count() == 0:

        messages.warning(request, 'No students in this course.')

        return redirect('teacher:index')

    else:

        return _mail_form(request, users)

@login_required

@staff_member_required

def mail_students(request, student_ids):

    id_list = [int(val) for val in student_ids.split(',')]

    users = User.objects.filter(pk__in=id_list).distinct()

    return _mail_form(request, users)

@login_required

@staff_member_required

def mail_preview(request):

    def _replace_placeholders(text, user):

@login_required

@staff_member_required

def mail_preview(request):

    def _replace_placeholders(text, user):

        return text.replace("#FIRSTNAME#", user['first_name'].strip()) \

                   .replace("#LASTNAME#", user['last_name'].strip())

    if 'mail_receivers' in request.session and \

       'subject' in request.POST and \

       'message' in request.POST:

        data = [{'subject': _replace_placeholders(request.POST['subject'], receiver),

                 'message': _replace_placeholders(request.POST['message'], receiver),

                 'to': receiver['email']

                 } for receiver in request.session['mail_receivers']]

        request.session['mail_data'] = data

        del request.session['mail_receivers']

        return render(request, 'mail_preview.html', {'data': data})

    else:

        messages.error(request, 'Error while rendering mail preview.')

        return redirect('teacher:index')

@login_required

@staff_member_required

def mail_send(request):

    if 'mail_data' in request.session:

        tosend = [[d['subject'],