Resolve "Allow teachers opening lessons on the same day before they start"

Closes #95 (closed)

aleksis/apps/alsijil/migrations/0007_personal_note_lesson_documentation_year.py

+# Generated by Django 3.0.9 on 2020-08-15 09:39
+
+from django.db import migrations, models
+
+import aleksis.apps.chronos.util.date
+
+
+def migrate_data(apps, schema_editor):
+    PersonalNote = apps.get_model("alsijil", "PersonalNote")
+    LessonDocumentation = apps.get_model("alsijil", "LessonDocumentation")
+
+    db_alias = schema_editor.connection.alias
+
+    for note in PersonalNote.objects.using(db_alias).all():
+        year = note.lesson_period.lesson.validity.date_start.year
+        if note.week < int(
+            note.lesson_period.lesson.validity.date_start.strftime("%V")
+        ):
+            year += 1
+        note.year = year
+        note.save()
+
+    for doc in LessonDocumentation.objects.using(db_alias).all():
+        year = doc.lesson_period.lesson.validity.date_start.year
+        if doc.week < int(doc.lesson_period.lesson.validity.date_start.strftime("%V")):
+            year += 1
+        doc.year = year
+        doc.save()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("alsijil", "0006_delete_personal_notes_filter"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="lessondocumentation",
+            name="year",
+            field=models.IntegerField(
+                default=aleksis.apps.chronos.util.date.get_current_year,
+                verbose_name="Year",
+            ),
+        ),
+        migrations.AddField(
+            model_name="personalnote",
+            name="year",
+            field=models.IntegerField(
+                default=aleksis.apps.chronos.util.date.get_current_year,
+                verbose_name="Year",
+            ),
+        ),
+        migrations.RunPython(migrate_data),
+    ]