finance/admin: add statement unconfirm button

jdav_web/finance/admin.py

@@ -259,6 +259,48 @@ class StatementConfirmedAdmin(admin.ModelAdmin):
         # To preserve integrity, no one is allowed to change confirmed statements
         return False
 
+    def get_urls(self):
+        urls = super().get_urls()
+
+        def wrap(view):
+            def wrapper(*args, **kwargs):
+                return self.admin_site.admin_view(view)(*args, **kwargs)
+
+            wrapper.model_admin = self
+            return update_wrapper(wrapper, view)
+
+        custom_urls = [
+            path(
+                "<path:object_id>/unconfirm/",
+                wrap(self.unconfirm_view),
+                name="%s_%s_unconfirm" % (self.opts.app_label, self.opts.model_name),
+            ),
+        ]
+        return custom_urls + urls
+
+    def unconfirm_view(self, request, object_id):
+        statement = StatementConfirmed.objects.get(pk=object_id)
+        if not statement.confirmed:
+            messages.error(request,
+                    _("%(name)s is not yet confirmed.") % {'name': str(statement)})
+            return HttpResponseRedirect(reverse('admin:%s_%s_change' % (self.opts.app_label, self.opts.model_name), args=(statement.pk,)))
+        if "unconfirm" in request.POST:
+            statement.confirmed = False
+            statement.confirmed_date = None
+            statement.confired_by = None
+            statement.save()
+
+            messages.success(request,
+                    _("Successfully unconfirmed %(name)s. I hope you know what you are doing.")
+                    % {'name': str(statement)})
+            return HttpResponseRedirect(reverse('admin:%s_%s_changelist' % (self.opts.app_label, self.opts.model_name)))
+
+        context = dict(self.admin_site.each_context(request),
+                       title=_('Unconfirm statement'),
+                       opts=self.opts,
+                       statement=statement)
+
+        return render(request, 'admin/unconfirm_statement.html', context=context)
 
 @admin.register(Transaction)
 class TransactionAdmin(admin.ModelAdmin):

jdav_web/finance/templates/admin/unconfirm_statement.html

@@ -0,0 +1,41 @@
+{% extends "admin/base_site.html" %}
+{% load i18n admin_urls static %}
+
+{% block extrahead %}
+    {{ block.super }}
+    {{ media }}
+    <script src="{% static 'admin/js/cancel.js' %}" async></script>
+    <script type="text/javascript" src="{% static "admin/js/vendor/jquery/jquery.js" %}"></script>
+    <script type="text/javascript" src="{% static "admin/js/jquery.init.js" %}"></script>
+{% endblock %}
+
+{% block bodyclass %}{{ block.super }} app-{{ opts.app_label }} model-{{ opts.model_name }} admin-view
+{% endblock %}
+
+{% block breadcrumbs %}
+<div class="breadcrumbs">
+<a href="{% url 'admin:index' %}">{% translate 'Home' %}</a>
+&rsaquo; <a href="{% url 'admin:app_list' app_label=opts.app_label %}">{{ opts.app_config.verbose_name }}</a>
+&rsaquo; <a href="{% url opts|admin_urlname:'changelist' %}">{{ opts.verbose_name_plural|capfirst }}</a>
+&rsaquo; <a href="{% url opts|admin_urlname:'change' statement.pk|admin_urlquote %}">{{ statement|truncatewords:"18" }}</a>
+&rsaquo; {% translate 'Unconfirm' %}
+</div>
+{% endblock %}
+
+{% block content %}
+<h2>{% translate "Unconfirm statement" %}</h2>
+
+<p>
+{% blocktrans %}You are entering risk zone! Do you really want to manually set this statement back to unconfirmed?{% endblocktrans %}
+</p>
+
+<form action="" method="post">
+    {% csrf_token %}
+    <p>
+    <input type="checkbox" required>
+    {% blocktrans %}I am aware that this is not a standard procedure and this might cause data integrity issues.{% endblocktrans %}
+    </p>
+    <input class="default danger" type="submit" name="unconfirm" value="{% translate 'Unconfirm' %}">
+    <a class="button cancel-link" href="{% add_preserved_filters change_url %}">{% trans 'Cancel' %}</a>
+</form>
+{% endblock %}

jdav_web/templates/admin/finance/statementconfirmed/change_form_object_tools.html

@@ -4,7 +4,7 @@
 {% block object-tools-items %}
 
 <li>
-    {% url opts|admin_urlname:'submit' original.pk|admin_urlquote as invite_url %}
+    {% url opts|admin_urlname:'unconfirm' original.pk|admin_urlquote as invite_url %}
     <a class="historylink" href="{% add_preserved_filters invite_url %}">{% trans 'Unconfirm' %}</a>
 </li>