Add sub-events and relative date settings (#503)

* Data model

* little crud

* SubEventItemForm etc

* Drop SubEventItem.active, quota editor

* Fix failing tests

* First frontend stuff

* Addons form stuff

* Quota calculation

* net price display on EventIndex

* Add tests, solve some bugs

* Correct quota selection in more places, consolidate pricing logic

* Fix failing quota tests

* Fix TypeError

* Add tests for checkout

* Fixed a bug in QuotaForm

* Prevent immutable cart if a quota was removed from an item

* Add tests for pricing

* Handle waiting list

* Filter in check-in list

* Fixed import lost in rebase

* Fix waiting list widget

* Voucher management

* Voucher redemption

* Fix broken tests

* Add subevents to OrderChangeManager

* Create a subevent during event creation

* Fix bulk voucher creation

* Introduce subevent.active

* Copy from for subevents

* Show active in list

* ICal download for subevents

* Check start and end of presale

* Failing tests / show cart logic

* Test

* Rebase migrations

* REST API integration of sub-events

* Integrate quota calculation into the traditional quota form

* Make subevent argument to add_position optional

* Log-display foo

* pretixdroid and subevents

* Filter by subevent

* Add more tests

* Some mor tests

* Rebase fixes

* More tests

* Relative dates

* Restrict selection in relative datetime widgets

* Filter subevent list

* Re-label has_subevents

* Rebase fixes, subevents in calendar view

* Performance and caching issues

* Refactor calendar templates

* Permission tests

* Calendar fixes and month selection

* subevent selection

* Rename subevents to dates

* Add tests for calendar views

src/pretix/api/serializers/event.py

@@ -1,5 +1,7 @@
 from pretix.api.serializers.i18n import I18nAwareModelSerializer
 from pretix.base.models import Event
+from pretix.base.models.event import SubEvent
+from pretix.base.models.items import SubEventItem, SubEventItemVariation
 
 
 class EventSerializer(I18nAwareModelSerializer):
@@ -7,4 +9,27 @@ class EventSerializer(I18nAwareModelSerializer):
         model = Event
         fields = ('name', 'slug', 'live', 'currency', 'date_from',
                   'date_to', 'date_admission', 'is_public', 'presale_start',
-                  'presale_end', 'location')
+                  'presale_end', 'location', 'has_subevents')
+
+
+class SubEventItemSerializer(I18nAwareModelSerializer):
+    class Meta:
+        model = SubEventItem
+        fields = ('item', 'price')
+
+
+class SubEventItemVariationSerializer(I18nAwareModelSerializer):
+    class Meta:
+        model = SubEventItemVariation
+        fields = ('variation', 'price')
+
+
+class SubEventSerializer(I18nAwareModelSerializer):
+    item_price_overrides = SubEventItemSerializer(source='subeventitem_set', many=True)
+    variation_price_overrides = SubEventItemVariationSerializer(source='subeventitemvariation_set', many=True)
+
+    class Meta:
+        model = SubEvent
+        fields = ('id', 'name', 'date_from', 'date_to', 'active', 'date_admission',
+                  'presale_start', 'presale_end', 'location',
+                  'item_price_overrides', 'variation_price_overrides')