Make fields not required. Neccessary for lesson cacellation. Closes #30.

biscuit/apps/chronos/migrations/0001_initial.py

@@ -87,10 +87,10 @@ class Migration(migrations.Migration):
                 ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
                 ('week', models.IntegerField(default=biscuit.apps.chronos.util.current_week, verbose_name='Week')),
                 ('lesson_period', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='substitutions', to='chronos.LessonPeriod')),
-                ('room', models.ForeignKey(null=True, on_delete=django.db.models.deletion.CASCADE, to='chronos.Room')),
+                ('room', models.ForeignKey(null=True, blank=True, on_delete=django.db.models.deletion.CASCADE, to='chronos.Room')),
                 ('school', models.ForeignKey(default=biscuit.core.util.core_helpers.get_current_school, on_delete=django.db.models.deletion.CASCADE, to='core.School')),
-                ('subject', models.ForeignKey(null=True, on_delete=django.db.models.deletion.CASCADE, related_name='lesson_substitutions', to='chronos.Subject')),
-                ('teachers', models.ManyToManyField(related_name='lesson_substitutions', to='core.Person')),
+                ('subject', models.ForeignKey(null=True, blank=True, on_delete=django.db.models.deletion.CASCADE, related_name='lesson_substitutions', to='chronos.Subject')),
+                ('teachers', models.ManyToManyField(null=True, blank=True, related_name='lesson_substitutions', to='core.Person')),
             ],
             options={
                 'ordering': ['lesson_period__lesson__date_start', 'week', 'lesson_period__period__weekday', 'lesson_period__period__period'],

biscuit/apps/chronos/models.py

@@ -116,10 +116,10 @@ class LessonSubstitution(SchoolRelated):
 
     subject = models.ForeignKey(
         'Subject', on_delete=models.CASCADE,
-        related_name='lesson_substitutions', null=True)
+        related_name='lesson_substitutions', null=True, blank=True)
     teachers = models.ManyToManyField('core.Person',
-                                      related_name='lesson_substitutions')
-    room = models.ForeignKey('Room', models.CASCADE, null=True)
+                                      related_name='lesson_substitutions', blank=True, null=True)
+    room = models.ForeignKey('Room', models.CASCADE, null=True, blank=True)
 
     cancelled = models.BooleanField(default=False)