Refs #39 -- New concept of "teams" (#478)

* New models

* CRUD UI

* UI for adding/removing team members

* Log display for teams

* Fix invitations, move frontend

* Drop old models (incomplete)

* Drop more old stuff

* Drop even more old stuff

* Fix tests

* Fix permission test

* flake8 fix

* Add tests fore the new code

* Rebase migrations

src/pretix/control/forms/event.py

@@ -2,6 +2,7 @@ from django import forms
 from django.conf import settings
 from django.core.exceptions import ValidationError
 from django.core.validators import RegexValidator
+from django.db.models import Q
 from django.utils.timezone import get_current_timezone_name
 from django.utils.translation import ugettext_lazy as _
 from i18nfield.forms import I18nFormField, I18nTextarea
@@ -26,7 +27,7 @@ class EventWizardFoundationForm(forms.Form):
         self.fields['organizer'] = forms.ModelChoiceField(
             label=_("Organizer"),
             queryset=Organizer.objects.filter(
-                id__in=self.user.organizer_perms.filter(can_create_events=True).values_list('organizer', flat=True)
+                id__in=self.user.teams.filter(can_create_events=True).values_list('organizer', flat=True)
             ),
             widget=forms.RadioSelect,
             empty_label=None,
@@ -111,6 +112,16 @@ class EventWizardBasicsForm(I18nModelForm):
 
 class EventWizardCopyForm(forms.Form):
 
+    @staticmethod
+    def copy_from_queryset(user):
+        return Event.objects.filter(
+            Q(organizer_id__in=user.teams.filter(
+                all_events=True, can_change_event_settings=True, can_change_items=True
+            ).values_list('organizer', flat=True)) | Q(id__in=user.teams.filter(
+                can_change_event_settings=True, can_change_items=True
+            ).values_list('limit_events__id', flat=True))
+        )
+
     def __init__(self, *args, **kwargs):
         kwargs.pop('organizer')
         kwargs.pop('locales')
@@ -118,11 +129,7 @@ class EventWizardCopyForm(forms.Form):
         super().__init__(*args, **kwargs)
         self.fields['copy_from_event'] = forms.ModelChoiceField(
             label=_("Copy configuration from"),
-            queryset=Event.objects.filter(
-                id__in=self.user.event_perms.filter(
-                    can_change_items=True, can_change_settings=True
-                ).values_list('event', flat=True)
-            ),
+            queryset=EventWizardCopyForm.copy_from_queryset(self.user),
             widget=forms.RadioSelect,
             empty_label=_('Do not copy'),
             required=False

src/pretix/control/forms/organizer.py

@@ -1,8 +1,9 @@
 from django import forms
+from django.core.exceptions import ValidationError
 from django.utils.translation import ugettext_lazy as _
 
 from pretix.base.forms import I18nModelForm
-from pretix.base.models import Organizer
+from pretix.base.models import Organizer, Team
 from pretix.multidomain.models import KnownDomain
 
 
@@ -65,3 +66,35 @@ class OrganizerUpdateForm(OrganizerForm):
             instance.get_cache().clear()
 
         return instance
+
+
+class TeamForm(forms.ModelForm):
+
+    def __init__(self, *args, **kwargs):
+        organizer = kwargs.pop('organizer')
+        super().__init__(*args, **kwargs)
+        self.fields['limit_events'].queryset = organizer.events.all()
+
+    class Meta:
+        model = Team
+        fields = ['name', 'all_events', 'limit_events', 'can_create_events',
+                  'can_change_teams', 'can_change_organizer_settings',
+                  'can_change_event_settings', 'can_change_items',
+                  'can_view_orders', 'can_change_orders',
+                  'can_view_vouchers', 'can_change_vouchers']
+        widgets = {
+            'limit_events': forms.CheckboxSelectMultiple(attrs={
+                'data-inverse-dependency': '#id_all_events'
+            }),
+        }
+
+    def clean(self):
+        data = super().clean()
+        if self.instance.pk and not data['can_change_teams']:
+            if not self.instance.organizer.teams.exclude(pk=self.instance.pk).filter(
+                can_change_teams=True, members__isnull=False
+            ).exists():
+                raise ValidationError(_('The changes could not be saved because there would be no remaining team with '
+                                        'the permission to change teams and permissions.'))
+
+        return data