Merge branch 'data_migrations' into test (quasi #3)

seminar/migrations/0095_fix_zamereni.py

@@ -0,0 +1,34 @@
+# Generated by Django 2.2.24 on 2021-07-28 20:17
+
+from django.db import migrations
+
+def fix_zamereni(apps, schema_editor):
+	ContentType = apps.get_model('contenttypes', 'ContentType')
+	Problem = apps.get_model('seminar', 'Problem')
+	ProblemCT = ContentType.objects.get_for_model(Problem)
+	TaggedItem = apps.get_model('taggit', 'TaggedItem')
+
+	typy_problemu = [
+		'Clanek',
+		'Tema',
+		'Uloha',
+		'Konfera',
+		]
+	for typ in typy_problemu:
+		Model = apps.get_model('seminar', typ)
+		ModelCT = ContentType.objects.get_for_model(Model)
+		# Neumím jednoduše zjistit, které objekty jsou které, tak je prostě procyklím
+		for obj in Model.objects.all():
+			TaggedItem.objects.filter(object_id=obj.problem_ptr.id, content_type=ProblemCT).update(content_type=ModelCT)
+		
+
+class Migration(migrations.Migration):
+
+	dependencies = [
+		('seminar', '0094_auto_20210701_0149'),
+		('taggit', '0003_taggeditem_add_unique_index'),
+	]
+
+	operations = [
+		migrations.RunPython(fix_zamereni),
+	]