Add direct link to payment from registrations model admins

website/payments/templates/payments/widget.html

+{% load i18n %}
+<div class="readonly">
+  {% if widget.value %}
+    <a href="{{ url }}">
+    {% if processed %}
+      {% trans "Processed" %}
+      {% else %}
+      {% trans "Unprocessed" %}
+      {% endif %}
+    </a>
+  {% else %}
+    -
+  {% endif %}
+</div>

website/payments/widgets.py

+from django.forms import Widget
+
+from payments.models import Payment
+
+
+class PaymentWidget(Widget):
+    template_name = 'payments/widget.html'
+
+    def value_from_datadict(self, data, files, name):
+        return super().value_from_datadict(data, files, name)
+
+    def get_context(self, name, value, attrs):
+        context = super().get_context(name, value, attrs)
+        if value:
+            payment = Payment.objects.get(pk=value)
+            context['url'] = payment.get_admin_url()
+            context['processed'] = payment.processed
+        return context
+
+

website/registrations/admin.py

 """Registers admin interfaces for the registrations module"""
 from django.contrib import admin, messages
 from django.contrib.admin.utils import model_ngettext
+from django.forms import Field
 from django.utils.html import format_html
 from django.utils.translation import ugettext_lazy as _
 
+from payments.widgets import PaymentWidget
 from . import services
 from .models import Entry, Registration, Renewal
 
@@ -64,6 +66,14 @@ class RegistrationAdmin(admin.ModelAdmin):
     )
     actions = ['accept_selected', 'reject_selected']
 
+    def formfield_for_dbfield(self, db_field, request, **kwargs):
+        field = super().formfield_for_dbfield(db_field, request, **kwargs)
+        if db_field.name == 'payment':
+            return Field(widget=PaymentWidget,
+                         initial=field.initial,
+                         required=False)
+        return field
+
     def changeform_view(self, request, object_id=None, form_url='',
                         extra_context=None):
         """
@@ -93,10 +103,10 @@ class RegistrationAdmin(admin.ModelAdmin):
     def get_readonly_fields(self, request, obj=None):
         if obj is None or not (obj.status == Entry.STATUS_REJECTED or
                                obj.status == Entry.STATUS_ACCEPTED):
-            return ['status', 'created_at', 'updated_at', 'payment']
+            return ['status', 'created_at', 'updated_at']
         else:
             return [field.name for field in self.model._meta.get_fields()
-                    if field.editable]
+                    if field.editable and not field.name == 'payment']
 
     @staticmethod
     def name(obj):
@@ -155,6 +165,7 @@ class RenewalAdmin(RegistrationAdmin):
                             'length',
                             'membership_type',
                             'status',
+                            'payment',
                             'remarks',
                             'member',)
                     }),

website/registrations/forms.py

@@ -4,6 +4,7 @@ from django.forms import TypedChoiceField
 from django.utils import timezone
 from django.utils.translation import ugettext_lazy as _
 
+from payments.widgets import PaymentWidget
 from utils.snippets import datetime_to_lectureyear
 from .models import Registration, Renewal