Fix #1067 -- Allow to manually create partial payments

src/pretix/control/forms/orders.py

@@ -49,7 +49,7 @@ class ExtendForm(I18nModelForm):
         return data
 
 
-class MarkPaidForm(forms.Form):
+class ConfirmPaymentForm(forms.Form):
     force = forms.BooleanField(
         label=_('Overbook quota and ignore late payment'),
         help_text=_('If you check this box, this operation will be performed even if it leads to an overbooked quota '
@@ -75,6 +75,20 @@ class MarkPaidForm(forms.Form):
             del self.fields['force']
 
 
+class MarkPaidForm(ConfirmPaymentForm):
+    amount = forms.DecimalField(
+        required=True,
+        max_digits=10, decimal_places=2,
+        localize=True,
+        label=_('Payment amount'),
+    )
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        change_decimal_field(self.fields['amount'], self.instance.event.currency)
+        self.fields['amount'].initial = max(0, self.instance.pending_sum)
+
+
 class ExporterForm(forms.Form):
     def clean(self):
         data = super().clean()

src/pretix/control/templates/pretixcontrol/order/pay.html

@@ -18,17 +18,21 @@
     <form method="post" class="form-horizontal" href="">
         {% csrf_token %}
         <p>{% blocktrans trimmed %}
-            Do you really want to mark this order as paid?
+            Do you really want to create a manual payment for this order?
         {% endblocktrans %}</p>
         <input type="hidden" name="status" value="p" />
-        {% bootstrap_form form layout='horizontal' horizontal_label_class='sr-only' horizontal_field_class='col-md-12' %}
+        {% bootstrap_form_errors form %}
+        {% bootstrap_field form.amount layout='horizontal' %}
+        {% if form.force %}
+            {% bootstrap_field form.force layout='horizontal' horizontal_label_class='sr-only' horizontal_field_class='col-md-12' %}
+        {% endif %}
         <div class="form-group submit-group">
             <a class="btn btn-default btn-lg"
                     href="{% url "control:event.order" event=request.event.slug organizer=request.event.organizer.slug code=order.code %}">
                 {% trans "Cancel" %}
             </a>
             <button class="btn btn-primary btn-save btn-lg" type="submit">
-                {% trans "Mark as paid" %}
+                {% trans "Create payment" %}
             </button>
             <div class="clearfix"></div>
         </div>

src/pretix/control/views/orders.py

@@ -55,8 +55,8 @@ from pretix.base.views.mixins import OrderQuestionsViewMixin
 from pretix.base.views.tasks import AsyncAction
 from pretix.control.forms.filter import EventOrderFilterForm, RefundFilterForm
 from pretix.control.forms.orders import (
-    CommentForm, ExporterForm, ExtendForm, MarkPaidForm, OrderContactForm,
-    OrderLocaleForm, OrderMailForm, OrderPositionAddForm,
+    CommentForm, ConfirmPaymentForm, ExporterForm, ExtendForm, MarkPaidForm,
+    OrderContactForm, OrderLocaleForm, OrderMailForm, OrderPositionAddForm,
     OrderPositionChangeForm, OrderRefundForm, OtherOperationsForm,
 )
 from pretix.control.permissions import EventPermissionRequiredMixin
@@ -404,7 +404,7 @@ class OrderPaymentConfirm(OrderView):
 
     @cached_property
     def mark_paid_form(self):
-        return MarkPaidForm(
+        return ConfirmPaymentForm(
             instance=self.order,
             data=self.request.POST if self.request.method == "POST" else None,
         )
@@ -675,7 +675,7 @@ class OrderTransition(OrderView):
     def post(self, *args, **kwargs):
         to = self.request.POST.get('status', '')
         if self.order.status in (Order.STATUS_PENDING, Order.STATUS_EXPIRED) and to == 'p' and self.mark_paid_form.is_valid():
-            ps = max(0, self.order.pending_sum)
+            ps = self.mark_paid_form.cleaned_data['amount']
             try:
                 p = self.order.payments.get(
                     state__in=(OrderPayment.PAYMENT_STATE_PENDING, OrderPayment.PAYMENT_STATE_CREATED),
@@ -718,7 +718,7 @@ class OrderTransition(OrderView):
                 messages.warning(self.request, _('The order has been marked as paid, but we were unable to send a '
                                                  'confirmation mail.'))
             else:
-                messages.success(self.request, _('The order has been marked as paid.'))
+                messages.success(self.request, _('The payment has been created successfully.'))
         elif self.order.cancel_allowed() and to == 'c':
             cancel_order(self.order, user=self.request.user, send_mail=self.request.POST.get("send_email") == "on")
             messages.success(self.request, _('The order has been canceled.'))