Fix #386 -- Allow to copy products (#396)

* add copy item info functionality

* fix formatting

* Revert "fix formatting"

This reverts commit 779bd79e8b.

* Revert "add copy item info functionality"

This reverts commit dbec76bf5a.

* add copy functionality

* copy questions from item

* add copy functionality

* copy questions from item

* add copy functionality

* copy questions from item

src/pretix/control/forms/item.py

@@ -105,12 +105,32 @@ class ItemCreateForm(I18nModelForm):
                                                     'You can select the variations in the next step.'),
                                         required=False)
 
+    def __init__(self, *args, **kwargs):
+        self.event = kwargs['event']
+        super().__init__(*args, **kwargs)
+        self.fields['copy_from'] = forms.ModelChoiceField(
+            label=_("Copy product information"),
+            queryset=self.event.items.all(),
+            widget=forms.Select,
+            empty_label=_('Do not copy'),
+            required=False
+        )
+
     def save(self, *args, **kwargs):
         instance = super().save(*args, **kwargs)
         if self.cleaned_data.get('has_variations'):
-            ItemVariation.objects.create(
-                item=instance, value=__('Standard')
-            )
+            if self.cleaned_data.get('copy_from') and self.cleaned_data.get('copy_from').has_variations:
+                for variation in self.cleaned_data['copy_from'].variations.all():
+                    ItemVariation.objects.create(item=instance, value=variation.value, active=variation.active,
+                                                 position=variation.position, default_price=variation.default_price)
+            else:
+                ItemVariation.objects.create(
+                    item=instance, value=__('Standard')
+                )
+
+        for question in Question.objects.filter(items=self.cleaned_data.get('copy_from')):
+            question.items.add(instance)
+
         return instance
 
     class Meta:

src/pretix/control/templates/pretixcontrol/item/create.html

@@ -7,6 +7,7 @@
         <fieldset>
             <legend>{% trans "General information" %}</legend>
             {% bootstrap_field form.name layout="horizontal" %}
+            {% bootstrap_field form.copy_from layout="horizontal" %}
             {% bootstrap_field form.has_variations layout="horizontal" %}
             {% bootstrap_field form.admission layout="horizontal" %}
         </fieldset>

src/pretix/control/views/item.py

@@ -766,6 +766,16 @@ class ItemCreate(EventPermissionRequiredMixin, CreateView):
     @transaction.atomic
     def form_valid(self, form):
         messages.success(self.request, _('Your changes have been saved.'))
+        if form.cleaned_data['copy_from']:
+            form.instance.category = form.cleaned_data['copy_from'].category
+            form.instance.description = form.cleaned_data['copy_from'].description
+            form.instance.active = form.cleaned_data['copy_from'].active
+            form.instance.available_from = form.cleaned_data['copy_from'].available_from
+            form.instance.available_until = form.cleaned_data['copy_from'].available_until
+            form.instance.require_voucher = form.cleaned_data['copy_from'].require_voucher
+            form.instance.hide_without_voucher = form.cleaned_data['copy_from'].hide_without_voucher
+            form.instance.allow_cancel = form.cleaned_data['copy_from'].allow_cancel
+
         ret = super().form_valid(form)
         form.instance.log_action('pretix.event.item.added', user=self.request.user, data={
             k: (form.cleaned_data.get(k).name