add copy item info functionality

src/pretix/base/forms/__init__.py

@@ -22,13 +22,13 @@ class BaseI18nModelForm(BaseModelForm):
     This is a helperclass to construct an I18nModelForm.
     """
     def __init__(self, *args, **kwargs):
-        event = kwargs.pop('event', None)
+        self.event = kwargs.pop('event', None)
         locales = kwargs.pop('locales', None)
         super().__init__(*args, **kwargs)
-        if event or locales:
+        if self.event or locales:
             for k, field in self.fields.items():
                 if isinstance(field, I18nFormField):
-                    field.widget.enabled_langcodes = event.settings.get('locales') if event else locales
+                    field.widget.enabled_langcodes = self.event.settings.get('locales') if self.event else locales
 
 
 class I18nModelForm(six.with_metaclass(ModelFormMetaclass, BaseI18nModelForm)):

src/pretix/control/forms/item.py

@@ -100,10 +100,21 @@ class QuotaForm(I18nModelForm):
 
 
 class ItemCreateForm(I18nModelForm):
-    has_variations = forms.BooleanField(label=_('The product should exist in multiple variations'),
-                                        help_text=_('Select this option e.g. for t-shirts that come in multiple sizes. '
-                                                    'You can select the variations in the next step.'),
-                                        required=False)
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.fields['has_variations'] = forms.BooleanField(label=_('The product should exist in multiple variations'),
+                                                 help_text=_(
+                                                     'Select this option e.g. for t-shirts that come in multiple sizes. '
+                                                     'You can select the variations in the next step.'),
+                                                 required=False)
+        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)

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

@@ -9,6 +9,7 @@
             {% bootstrap_field form.name layout="horizontal" %}
             {% bootstrap_field form.has_variations layout="horizontal" %}
             {% bootstrap_field form.admission layout="horizontal" %}
+            {% bootstrap_field form.copy_from layout="horizontal" %}
         </fieldset>
         <fieldset>
             <legend>{% trans "Price settings" %}</legend>

src/pretix/control/views/item.py

@@ -757,6 +757,16 @@ 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