diff --git a/aleksis/apps/chronos/migrations/0002_school_term_validity.py b/aleksis/apps/chronos/migrations/0002_school_term_validity.py
new file mode 100644
index 0000000000000000000000000000000000000000..d43a7146345783544d7f056fb625f6b9bd7a034d
--- /dev/null
+++ b/aleksis/apps/chronos/migrations/0002_school_term_validity.py
@@ -0,0 +1,247 @@
+# Generated by Django 3.0.7 on 2020-06-27 14:00
+
+import django.contrib.postgres.fields.jsonb
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+def migrate_lesson(apps, schema_editor):
+ Lesson = apps.get_model("chronos", "Lesson")
+ ValidityRange = apps.get_model("chronos", "ValidityRange")
+ SchoolTerm = apps.get_model("core", "SchoolTerm")
+
+ db_alias = schema_editor.connection.alias
+
+ for lesson in Lesson.objects.using(db_alias).all():
+ date_start = lesson.date_start
+ date_end = lesson.date_end
+
+ try:
+ school_term = SchoolTerm.objects.using(db_alias).get(
+ date_start__lte=date_end, date_end__gte=date_start
+ )
+ except SchoolTerm.DoesNotExist:
+ school_term = SchoolTerm.objects.using(db_alias).create(
+ date_start=date_start, date_end=date_end
+ )
+
+ try:
+ validity_range = ValidityRange.objects.using(db_alias).get(
+ school_term=school_term,
+ date_start__lte=date_end,
+ date_end__gte=date_start,
+ )
+ except ValidityRange.DoesNotExist:
+ validity_range = ValidityRange.objects.using(db_alias).create(
+ date_start=date_start, date_end=date_end, school_term=school_term
+ )
+
+ lesson.validity = validity_range
+ lesson.save()
+
+
+class Migration(migrations.Migration):
+ dependencies = [
+ ("core", "0003_auto_20200627_1600"),
+ ("sites", "0002_alter_domain_unique"),
+ ("chronos", "0001_initial"),
+ ]
+
+ operations = [
+ migrations.CreateModel(
+ name="ValidityRange",
+ fields=[
+ (
+ "id",
+ models.AutoField(
+ auto_created=True,
+ primary_key=True,
+ serialize=False,
+ verbose_name="ID",
+ ),
+ ),
+ (
+ "extended_data",
+ django.contrib.postgres.fields.jsonb.JSONField(
+ default=dict, editable=False
+ ),
+ ),
+ (
+ "name",
+ models.CharField(blank=True, max_length=255, verbose_name="Name"),
+ ),
+ ("date_start", models.DateField(verbose_name="Start date")),
+ ("date_end", models.DateField(verbose_name="End date")),
+ ],
+ options={
+ "verbose_name": "Validity range",
+ "verbose_name_plural": "Validity ranges",
+ },
+ ),
+ migrations.AlterModelOptions(
+ name="lesson",
+ options={
+ "ordering": ["validity__date_start", "subject"],
+ "verbose_name": "Lesson",
+ "verbose_name_plural": "Lessons",
+ },
+ ),
+ migrations.AlterModelOptions(
+ name="lessonperiod",
+ options={
+ "ordering": [
+ "lesson__validity__date_start",
+ "period__weekday",
+ "period__period",
+ "lesson__subject",
+ ],
+ "verbose_name": "Lesson period",
+ "verbose_name_plural": "Lesson periods",
+ },
+ ),
+ migrations.AlterModelOptions(
+ name="lessonsubstitution",
+ options={
+ "ordering": [
+ "lesson_period__lesson__validity__date_start",
+ "week",
+ "lesson_period__period__weekday",
+ "lesson_period__period__period",
+ ],
+ "verbose_name": "Lesson substitution",
+ "verbose_name_plural": "Lesson substitutions",
+ },
+ ),
+ migrations.AlterModelManagers(name="break", managers=[],),
+ migrations.AlterModelManagers(name="exam", managers=[],),
+ migrations.AlterModelManagers(name="lesson", managers=[],),
+ migrations.AlterModelManagers(name="timeperiod", managers=[],),
+ migrations.AddField(
+ model_name="absence",
+ name="school_term",
+ field=models.ForeignKey(
+ blank=True,
+ null=True,
+ on_delete=django.db.models.deletion.CASCADE,
+ related_name="+",
+ to="core.SchoolTerm",
+ verbose_name="Linked school term",
+ ),
+ ),
+ migrations.AddField(
+ model_name="break",
+ name="school_term",
+ field=models.ForeignKey(
+ blank=True,
+ null=True,
+ on_delete=django.db.models.deletion.CASCADE,
+ related_name="+",
+ to="core.SchoolTerm",
+ verbose_name="Linked school term",
+ ),
+ ),
+ migrations.AddField(
+ model_name="event",
+ name="school_term",
+ field=models.ForeignKey(
+ blank=True,
+ null=True,
+ on_delete=django.db.models.deletion.CASCADE,
+ related_name="+",
+ to="core.SchoolTerm",
+ verbose_name="Linked school term",
+ ),
+ ),
+ migrations.AddField(
+ model_name="exam",
+ name="school_term",
+ field=models.ForeignKey(
+ blank=True,
+ null=True,
+ on_delete=django.db.models.deletion.CASCADE,
+ related_name="+",
+ to="core.SchoolTerm",
+ verbose_name="Linked school term",
+ ),
+ ),
+ migrations.AddField(
+ model_name="extralesson",
+ name="school_term",
+ field=models.ForeignKey(
+ blank=True,
+ null=True,
+ on_delete=django.db.models.deletion.CASCADE,
+ related_name="+",
+ to="core.SchoolTerm",
+ verbose_name="Linked school term",
+ ),
+ ),
+ migrations.AddField(
+ model_name="validityrange",
+ name="school_term",
+ field=models.ForeignKey(
+ on_delete=django.db.models.deletion.CASCADE,
+ related_name="validity_ranges",
+ to="core.SchoolTerm",
+ verbose_name="School term",
+ ),
+ ),
+ migrations.AddField(
+ model_name="validityrange",
+ name="site",
+ field=models.ForeignKey(
+ default=1,
+ editable=False,
+ on_delete=django.db.models.deletion.CASCADE,
+ to="sites.Site",
+ ),
+ ),
+ migrations.AddField(
+ model_name="lesson",
+ name="validity",
+ field=models.ForeignKey(
+ on_delete=django.db.models.deletion.CASCADE,
+ related_name="+",
+ to="chronos.ValidityRange",
+ verbose_name="Linked validity range",
+ null=True,
+ blank=True,
+ ),
+ preserve_default=False,
+ ),
+ migrations.AddField(
+ model_name="supervision",
+ name="validity",
+ field=models.ForeignKey(
+ on_delete=django.db.models.deletion.CASCADE,
+ related_name="+",
+ to="chronos.ValidityRange",
+ verbose_name="Linked validity range",
+ null=True,
+ blank=True,
+ ),
+ preserve_default=False,
+ ),
+ migrations.AddField(
+ model_name="timeperiod",
+ name="validity",
+ field=models.ForeignKey(
+ on_delete=django.db.models.deletion.CASCADE,
+ related_name="+",
+ to="chronos.ValidityRange",
+ verbose_name="Linked validity range",
+ null=True,
+ blank=True,
+ ),
+ preserve_default=False,
+ ),
+ migrations.AlterUniqueTogether(
+ name="validityrange", unique_together={("date_start", "date_end")},
+ ),
+ migrations.RunPython(migrate_lesson),
+ migrations.RemoveIndex(
+ model_name="lesson", name="chronos_les_date_st_5ecc62_idx",
+ ),
+ migrations.RemoveField(model_name="lesson", name="date_end",),
+ migrations.RemoveField(model_name="lesson", name="date_start",),
+ ]