Convert HTML metadatas as markdown

Closes #78 (closed)

arkindex/documents/migrations/0030_convert_html_metadata_as_markdown.py

+# Generated by Django 3.1.7 on 2021-03-17 08:26
+from django.db import migrations
+
+from arkindex.documents.models import MetaType
+
+
+def convert_html_metadata_to_markdown(apps, schema_editor):
+    MetaData = apps.get_model('documents', 'MetaData')
+    AllowedMetaData = apps.get_model('documents', 'AllowedMetaData')
+    MetaData.objects.exclude(type__in=[mt.value for mt in MetaType]).update(type=MetaType.Markdown)
+    AllowedMetaData.objects.exclude(type__in=[mt.value for mt in MetaType]).update(type=MetaType.Markdown)
+
+
+def convert_markdown_metadata_to_html(apps, schema_editor):
+    MetaData = apps.get_model('documents', 'MetaData')
+    AllowedMetaData = apps.get_model('documents', 'AllowedMetaData')
+    MetaData.objects.exclude(type__in=[mt.value for mt in MetaType]).update(type=MetaType.HTML)
+    AllowedMetaData.objects.exclude(type__in=[mt.value for mt in MetaType]).update(type=MetaType.HTML)
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('documents', '0029_corpus_top_level_type'),
+    ]
+
+    operations = [
+        migrations.RunPython(
+            convert_html_metadata_to_markdown,
+            reverse_code=convert_markdown_metadata_to_html,
+            elidable=True,
+        ),
+    ]