Resolve "Link substitutions and other week-related stuff not only to weeks, but also to years"

Closes #91 (closed)

aleksis/apps/chronos/migrations/0004_substitution_extra_lesson_year.py

+# Generated by Django 3.0.9 on 2020-08-13 14:06
+
+from django.db import migrations, models
+
+import aleksis.apps.chronos.util.date
+
+
+def migrate_data(apps, schema_editor):
+    LessonSubstitution = apps.get_model("chronos", "LessonSubstitution")
+    ExtraLesson = apps.get_model("chronos", "ExtraLesson")
+
+    db_alias = schema_editor.connection.alias
+
+    for sub in LessonSubstitution.objects.using(db_alias).all():
+        year = sub.lesson_period.lesson.validity.date_start.year
+        if sub.week < int(sub.lesson_period.lesson.validity.date_start.strftime("%V")):
+            year += 1
+        sub.year = year
+        sub.save()
+
+    for extra_lesson in ExtraLesson.objects.using(db_alias).all():
+        year = aleksis.apps.chronos.util.date.get_current_year()
+        extra_lesson.year = year
+        extra_lesson.save()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("core", "0003_drop_image_cropping"),
+        ("chronos", "0003_school_term_validity_fixes"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="extralesson",
+            name="year",
+            field=models.IntegerField(
+                default=aleksis.apps.chronos.util.date.get_current_year,
+                verbose_name="Year",
+            ),
+        ),
+        migrations.AddField(
+            model_name="lessonsubstitution",
+            name="year",
+            field=models.IntegerField(
+                default=aleksis.apps.chronos.util.date.get_current_year,
+                verbose_name="Year",
+            ),
+        ),
+        migrations.RunPython(migrate_data),
+    ]