Use a selector to choose a problem number

apps/participation/migrations/0007_auto_20210112_1801.py

@@ -0,0 +1,29 @@
+# Generated by Django 3.0.11 on 2021-01-12 17:01
+
+from django.db import migrations, models
+import participation.models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('participation', '0006_participation_final'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='solution',
+            name='file',
+            field=models.FileField(blank=True, default='', unique=True, upload_to=participation.models.get_solution_filename, verbose_name='file'),
+        ),
+        migrations.AlterField(
+            model_name='solution',
+            name='problem',
+            field=models.PositiveSmallIntegerField(choices=[(1, 'Problem #1'), (2, 'Problem #2'), (3, 'Problem #3'), (4, 'Problem #4'), (5, 'Problem #5'), (6, 'Problem #6'), (7, 'Problem #7'), (8, 'Problem #8')], verbose_name='problem'),
+        ),
+        migrations.AlterField(
+            model_name='synthesis',
+            name='file',
+            field=models.FileField(blank=True, default='', unique=True, upload_to=participation.models.get_random_synthesis_filename, verbose_name='file'),
+        ),
+    ]

apps/participation/models.py

@@ -4,12 +4,14 @@
 import os
 
 from address.models import AddressField
+from django.conf import settings
 from django.core.validators import RegexValidator
 from django.db import models
 from django.db.models import Index
 from django.urls import reverse_lazy
 from django.utils import timezone
 from django.utils.crypto import get_random_string
+from django.utils.text import format_lazy
 from django.utils.translation import gettext_lazy as _
 from registration.models import VolunteerRegistration
 from tfjm.lists import get_sympa_client
@@ -331,6 +333,9 @@ class Solution(models.Model):
 
     problem = models.PositiveSmallIntegerField(
         verbose_name=_("problem"),
+        choices=[
+            (i, format_lazy(_("Problem #{problem}"), problem=i)) for i in range(1, settings.PROBLEM_COUNT + 1)
+        ],
     )
 
     final_solution = models.BooleanField(

tfjm/settings.py

@@ -236,3 +236,6 @@ GOOGLE_API_KEY = os.getenv("GOOGLE_API_KEY")
 
 # Use local Jquery
 JQUERY_URL = False
+
+# Custom parameters
+PROBLEM_COUNT = 8