Add support for multiple linked_orderpositions on reusable media (#5666)

* change linked orderpositions to many-to-many

* Update media views to list ops

* return last op as fallback for linked_orderposition

* add multi-op to export

* update media-API

* fix media-view filter

* update control media forms

* fix API orders

* fix API orders matching media

* remove cached_property linked_orderposition - keep only in API

* fix media-issue signal

* adapt checkin API for multiple orderpositions

* remove unneeded comment

* fix create/update logging

* fix tests

* fix more tests

* fix code style

* add label to reusablemedium

* fix migration NOT NULL

* fix tests

* update docs

* clarify docs updating multiple linked_orderpositions

* clarify docs

* no need to prefetch linked_orderpositions

* improve readability

* select_related order instead prefetch

* add filter based on op.valid_from/until

* rename secret to claim_token

* Update docs for claim_token

* unifiy deprecated style

* Update reusablemedia.rst

* Update reusablemedia.rst

* Update reusablemedia.rst

* fix missing claim_token in serializer

* fix flake8

* add add_to_reusable_medium to order-serializer

* fix tests regarding claim_token

* fix flake8

* Clarify docs

* list ops comma-separated in export

* Add test for order-API add_to_reusable_medium

* fix linked_orderpositions filter in checkinrpc

* add test

* Add help-text

* fix multi-op media filter

* fix flake8

* improve check

* Fix sorting of reusable media type in overview

* Add copy and qr button to reusable medium detail view

* Rebase against origin/master

* Add logentrytype reusable_medium.linked_orderposition.removed

* add missing label_from_instance for SafeOrderPositionMultipleChoiceField

* add tests for create with linked_orderposition

* API add test for fallback-values in medium patch

* fix flake8

* Fix indentation

* fix migrations numbering

* fix test

* unify qutation marks

* fix flake8

* micro-improve linked_op-removal-logging

* simplify filter instead of annotate/get

* Do not translate API-errors

Co-authored-by: Raphael Michel <michel@pretix.eu>

* Fix typos in doc

Co-authored-by: Raphael Michel <mail@raphaelmichel.de>

* Update versionchanged in docs

Co-authored-by: Raphael Michel <michel@pretix.eu>

* Change log to always added not changed

* Add test for checkinrpc for ops out of timerang or canceled

* improve tests mixing ops from different organizers

* Fix logging of changed order_positions

* properly log added/removed when using UI

* refactor logging code

* unify logging adding/removing ops via API

* fix flake8

* remove unnecessary prefetch as already prefetched

* optimize fetching ops

* combine addon match and time-based validity match

* fix combined valid and product check

* re-number migrations

* Apply suggestion from @raphaelm

Co-authored-by: Raphael Michel <michel@pretix.eu>

* fix flake8

* New attempt at logic

* Improve op_candidate-selection for error message if no op matches check-in

* Fix typo

* fix valid_from start time being included

* use the datetime parameter for the comparison time so that the simulator works too

---------

Co-authored-by: Maximilian Richt <richt@pretix.eu>
Co-authored-by: Martin Gross <gross@rami.io>
Co-authored-by: Raphael Michel <michel@pretix.eu>
Co-authored-by: Raphael Michel <mail@raphaelmichel.de>

src/pretix/base/models/media.py

@@ -72,6 +72,16 @@ class ReusableMedium(LoggedModel):
         max_length=200,
         verbose_name=pgettext_lazy('reusable_medium', 'Identifier'),
     )
+    claim_token = models.CharField(
+        max_length=200,
+        verbose_name=pgettext_lazy('reusable_medium', 'Claim token'),
+        null=True, blank=True
+    )
+    label = models.CharField(
+        max_length=200,
+        verbose_name=pgettext_lazy('reusable_medium', 'Label'),
+        null=True, blank=True
+    )
 
     active = models.BooleanField(
         verbose_name=_('Active'),
@@ -89,12 +99,14 @@ class ReusableMedium(LoggedModel):
         on_delete=models.SET_NULL,
         verbose_name=_('Customer account'),
     )
-    linked_orderposition = models.ForeignKey(
+    linked_orderpositions = models.ManyToManyField(
         OrderPosition,
-        null=True, blank=True,
         related_name='linked_media',
-        on_delete=models.SET_NULL,
-        verbose_name=_('Linked ticket'),
+        verbose_name=_('Linked tickets'),
+        help_text=_(
+            'If you link to more than one ticket, make sure there is no overlap in validity. '
+            'If multiple tickets are valid at once, this will lead to failed check-ins.'
+        )
     )
     linked_giftcard = models.ForeignKey(
         GiftCard,