Add order-level telephone field to core (#1872)

Co-authored-by: Martin Gross <gross@rami.io>

src/pretix/base/migrations/0173_auto_20201211_1648.py

@@ -0,0 +1,51 @@
+# Generated by Django 3.0.11 on 2020-12-11 16:48
+import json
+
+import phonenumber_field.modelfields
+from django.db import migrations
+
+import pretix.base.models.fields
+
+
+def migrate_settings(apps, schema_editor):
+    Order = apps.get_model('pretixbase', 'Order')
+    Event = apps.get_model('pretixbase', 'Event')
+    Event_SettingsStore = apps.get_model('pretixbase', 'Event_SettingsStore')
+    Event_SettingsStore.objects.filter(key='telephone_field_required').update(key='order_phone_required')
+    Event_SettingsStore.objects.filter(key='telephone_field_help_text').update(key='checkout_phone_helptext')
+    for e in Event.objects.filter(plugins__icontains="pretix_telephone"):
+        plugins = e.plugins.split(",")
+        plugins.remove("pretix_telephone")
+        e.plugins = ",".join(plugins)
+        e.save()
+        Event_SettingsStore.objects.create(object=e, key='order_phone_asked', value='True')
+    for o in Order.objects.filter(meta_info__icontains='"telephone"'):
+        mi = json.loads(o.meta_info)
+        if 'telephone' in mi.get('contact_form_data', {}):
+            mi['phone'] = mi['contact_form_data'].pop('telephone')
+            o.phone = mi['phone']
+            o.meta_info = json.dumps(mi)
+            o.save(update_fields=['meta_info', 'phone'])
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0172_event_sales_channels'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='order',
+            name='phone',
+            field=phonenumber_field.modelfields.PhoneNumberField(max_length=128, null=True, region=None),
+        ),
+        migrations.AlterField(
+            model_name='event',
+            name='sales_channels',
+            field=pretix.base.models.fields.MultiStringField(default=['web']),
+        ),
+        migrations.RunPython(
+            migrate_settings, migrations.RunPython.noop,
+        )
+    ]