Fix #515 -- Add check-in lists (#693)

* Data model and migration

* Some backwards compatibility

* CRUD for checkin lists

* Show and perform checkins

* Correct numbers in table and dashboard widget

* event creation and cloning

* Allow to link specific exports and pass options per query

* Play with the CSV export

* PDF export

* Collapse exports by default

* Improve PDF exporter

* Addon stuff

* Subevent stuff, pretixdroid tests

* pretixdroid tests

* Add CRUD API

* Test compatibility

* Fix test

* DB-independent sorting behavior

* Add CRUD and coyp tests

* Re-enable pretixdroid plugin

* pretixdroid config

* Tests & fixes

src/pretix/control/views/orders.py

@@ -147,7 +147,7 @@ class OrderDetail(OrderView):
         ).select_related(
             'item', 'variation', 'addon_to', 'tax_rule'
         ).prefetch_related(
-            'item__questions', 'answers', 'answers__question', 'checkins'
+            'item__questions', 'answers', 'answers__question', 'checkins', 'checkins__list'
         ).order_by('positionid')
 
         positions = []
@@ -906,9 +906,21 @@ class ExportMixin:
         responses = register_data_exporters.send(self.request.event)
         for receiver, response in responses:
             ex = response(self.request.event)
+            if self.request.GET.get("identifier") and ex.identifier != self.request.GET.get("identifier"):
+                continue
+
+            # Use form parse cycle to generate useful defaults
+            test_form = ExporterForm(data=self.request.GET, prefix=ex.identifier)
+            test_form.fields = ex.export_form_fields
+            test_form.is_valid()
+            initial = {
+                k: v for k, v in test_form.cleaned_data.items() if ex.identifier + "-" + k in self.request.GET
+            }
+
             ex.form = ExporterForm(
                 data=(self.request.POST if self.request.method == 'POST' else None),
-                prefix=ex.identifier
+                prefix=ex.identifier,
+                initial=initial
             )
             ex.form.fields = ex.export_form_fields
             exporters.append(ex)