[TASK] Make skip button in person map wizard work as expected.

frontend/templates/project/map-person.html

@@ -4,6 +4,7 @@
 {% endblock %}
 {% block navbar-header %}
 	<li><a href="{% url 'frontend-projects' %}">Back to projects</a></li>
+	<li><a href="{% url 'frontend-project-view-person' project.id %}">Back to person list</a></li>
 {% endblock %}
 {% block content %}
 	<h3>Current subject:</h3>

frontend/views.py

@@ -190,7 +190,6 @@ class ProjectPersonView(ProtectedFormView, SingleObjectMixin):
 
     def get_context_data(self, **kwargs):
         project = self.object
-
         kwargs[u'unmapped_persons'] = person_mapper.get_unmapped_identities(project)
         kwargs[u'mapped_persons'] = person_mapper.get_mapped_identities(project)
         return super(ProjectPersonView, self).get_context_data(**kwargs)
@@ -217,18 +216,44 @@ class ProjectMapPersonView(ProtectedFormView, SingleObjectMixin):
 
     success_url = u'/project'
 
+    _unmapped_persons = None
+
+    def _refresh_unmapped(self):
+        """ Refresh data about unmapped persons. """
+        self._unmapped_persons = person_mapper.get_unmapped_identities(self.object)
+
+    def _is_unmapped(self, person_uuid):
+        """ Returns True if the given person is not mapped yet. """
+        if not self._unmapped_persons:
+            self._refresh_unmapped()
+        return person_uuid in self._unmapped_persons
+
     def get_context_data(self, **kwargs):
         project = self.object
         kwargs[u'person'] = person_mapper.get_person_by_uuid(project, self.person_uuid)
         return super(ProjectMapPersonView, self).get_context_data(**kwargs)
 
     def get_success_url(self):
-        unmapped_persons = person_mapper.get_unmapped_identities(self.object)
-        project_id = self.object.id
-        person = unmapped_persons.itervalues().next()
+        """ TODO: Make this work! - Update success uri to next unmapped person. """
+        last_uuid = unicode(self.person_uuid)
+        self._refresh_unmapped()
+        unmapped = self._unmapped_persons.items()
+        first_person_uuid = unmapped[0][0]
+        next_uuid = first_person_uuid
+        unmapped.reverse()
+
+        while True:
+            try:
+                current_person = unmapped.pop()
+                if current_person[1].ID == last_uuid:
+                    next_uuid = unmapped.pop()[0]
+                    break
+            except IndexError:
+                break
+
         kwargs = {
-            u"project_id": project_id,
-            u"person_uuid": person.ID
+            u"project_id": self.object.id,
+            u"person_uuid": next_uuid
         }
         return reverse('frontend-project-map-person', kwargs=kwargs)
 
@@ -236,13 +261,18 @@ class ProjectMapPersonView(ProtectedFormView, SingleObjectMixin):
         self.project_id = kwargs[u'project_id']
         self.person_uuid = kwargs[u'person_uuid']
         self.object = Project.objects.get(pk=self.project_id)
+        if self._is_unmapped(self.person_uuid) == False:
+            raise Exception("Sorry, this person was already mapped. Try deleting the existing mapping and move on. TODO: Make this more beautiful.")
+        self._refresh_unmapped()
         return super(ProjectMapPersonView, self).get(request, *args, **kwargs)
 
     def post(self, request, *args, **kwargs):
         self.project_id = kwargs[u'project_id']
         self.person_uuid = kwargs[u'person_uuid']
         self.object = Project.objects.get(pk=self.project_id)
-        # self.success_url = self.success_url + self.project_id + '/update'
+        if self._is_unmapped(self.person_uuid) == False:
+            raise Exception("Sorry, this person was already mapped. Try deleting the existing mapping and move on. TODO: Make this more beautiful.")
+        self._refresh_unmapped()
         return super(ProjectMapPersonView, self).post(request, *args, **kwargs)
 
     def form_valid(self, form, *args, **kwargs):