feat(lms): add deadlines and manual assignment closing logic

lmsege/lms/admin.py

@@ -18,9 +18,9 @@ class QuestionInline(StackedInline):
 
 @admin.register(Assignment)
 class AssignmentAdmin(ModelAdmin):
-    list_display = ('title', 'subject', 'is_published', 'created_at')
+    list_display = ('title', 'subject', 'is_published', 'is_closed', 'deadline', 'created_at')
     list_display_links = ('title',)
-    list_filter = ('subject', 'is_published')
+    list_filter = ('subject', 'is_published', 'is_closed')
     search_fields = ('title', 'description')
     exclude = ('created_by',)
     filter_horizontal = ('assigned_students',)

lmsege/lms/models.py

@@ -22,6 +22,8 @@ class Assignment(models.Model):
     assigned_students = models.ManyToManyField(settings.AUTH_USER_MODEL, related_name='assigned_assignments', verbose_name='Назначенные ученики', blank=True, limit_choices_to={'role': 'STUDENT'}, help_text='Выберите учеников, если задание не для всех.')
     created_by = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, limit_choices_to={'role__in': ['TEACHER', 'ADMIN']}, verbose_name='Кем создано')
     created_at = models.DateTimeField('Дата создания', auto_now_add=True)
+    deadline = models.DateTimeField('Дедлайн', blank=True, null=True, help_text='После этого времени ответы не принимаются.')
+    is_closed = models.BooleanField('Прием ответов закрыт', default=False, help_text='Включите, чтобы вручную закрыть прием ответов на задание.')
     
     class Meta:
         verbose_name = 'Задание'

lmsege/lms/templates/lms/assignment_detail.html

@@ -94,6 +94,11 @@
             </div>
             {% endfor %}
         </div>
+    {% elif not can_submit %}
+        <div class="mb-6 p-4 rounded-lg border bg-red-50 text-red-800 border-red-200">
+            <h4 class="font-bold mb-2">Прием ответов завершен</h4>
+            <p>Вы больше не можете отправлять ответы, так как дедлайн истек или преподаватель закрыл задание.</p>
+        </div>
     {% else %}
         <form method="post" enctype="multipart/form-data" class="space-y-6">
             {% csrf_token %}

lmsege/lms/templates/lms/dashboard.html

@@ -51,6 +51,18 @@
                         <span class="material-icons text-[14px]">event</span> 
                         Добавлено: {{ assignment.created_at|date:"d M Y" }}
                     </span>
+                    {% if assignment.deadline %}
+                    <span class="flex items-center gap-1 {% if assignment.is_closed or assignment.deadline < now %}text-red-500{% else %}text-gray-500{% endif %}">
+                        <span class="material-icons text-[14px]">timer</span> 
+                        Дедлайн: {{ assignment.deadline|date:"d M Y, H:i" }}
+                    </span>
+                    {% endif %}
+                    {% if assignment.is_closed %}
+                    <span class="flex items-center gap-1 text-red-500 font-medium mt-1">
+                        <span class="material-icons text-[14px]">lock</span> 
+                        Прием ответов закрыт
+                    </span>
+                    {% endif %}
                 </div>
             </div>
             <div class="bg-gray-50 p-4 border-t border-gray-100">

lmsege/lms/views.py

@@ -44,10 +44,12 @@ def dashboard(request):
     submissions = Submission.objects.filter(student=request.user)
     submitted_assignment_ids = submissions.values_list('assignment_id', flat=True)
 
+    from django.utils import timezone
     return render(request, 'lms/dashboard.html', {
         'assignments': assignments,
         'submitted_assignment_ids': submitted_assignment_ids,
-        'submissions': {sub.assignment_id: sub for sub in submissions}
+        'submissions': {sub.assignment_id: sub for sub in submissions},
+        'now': timezone.now()
     })
 
 @login_required
@@ -59,13 +61,22 @@ def assignment_detail(request, pk):
     # Try to get existing submission
     submission = Submission.objects.filter(assignment=assignment, student=request.user).first()
     
+    from django.utils import timezone
+    can_submit = True
+    if assignment.is_closed:
+        can_submit = False
+    if assignment.deadline and timezone.now() > assignment.deadline:
+        can_submit = False
+
     if submission:
         if request.method == 'POST':
             # Do not allow updating
             return redirect('lms:dashboard')
         form = None
     else:
-        if request.method == 'POST':
+        if not can_submit:
+            form = None
+        elif request.method == 'POST':
             form = AnswersForm(request.POST, request.FILES, questions=questions)
             if form.is_valid():
                 submission = Submission.objects.create(assignment=assignment, student=request.user)
@@ -153,4 +164,5 @@ def assignment_detail(request, pk):
         'submission': submission,
         'questions': questions,
         'question_fields': question_fields,
+        'can_submit': can_submit,
     })