visit can be added when all there is no active visit

smash/web/templates/subjects/visitdetails.html

@@ -25,8 +25,10 @@
             <div class="box-header with-border">
                 <a href="{% url 'web.views.subject_edit' id %}"
                    class="btn btn-block btn-default">Subject</a>
-                <a href="{% url 'web.views.visit_add' id %}" type="button" class="btn btn-block btn-default">Add
-                    visit</a>
+                {% if allow_add_visit %}
+                    <a href="{% url 'web.views.visit_add' id %}" type="button" class="btn btn-block btn-default">
+                        Add visit</a>
+                {% endif %}
             </div>
 
             <div class="box-body">

smash/web/tests/test_view_subjects.py

@@ -42,6 +42,14 @@ class SubjectsViewTests(TestCase):
 
         response = self.client.get(reverse('web.views.subject_visit_details', kwargs={'id': subject.id}))
         self.assertEqual(response.status_code, 200)
+        self.assertFalse("Add visit" in response.content)
+
+    def test_render_subject_visit_details(self):
+        subject = create_subject()
+
+        response = self.client.get(reverse('web.views.subject_visit_details', kwargs={'id': subject.id}))
+        self.assertEqual(response.status_code, 200)
+        self.assertTrue("Add visit" in response.content)
 
     def test_save_subject_edit(self):
         subject = create_subject()

smash/web/views/subject.py

@@ -82,9 +82,10 @@ def subject_edit(request, id):
 
 
 def subject_visit_details(request, id):
-    subjects = get_object_or_404(Subject, id=id)
-    visits = subjects.visit_set.all()
+    subject_to_be_viewed = get_object_or_404(Subject, id=id)
+    visits = subject_to_be_viewed.visit_set.all()
     visits_data = []
+    allow_add_visit = True
     for visit in visits:
         appointments = visit.appointment_set.all()
         finished = visit.is_finished
@@ -92,5 +93,8 @@ def subject_visit_details(request, id):
         visit_title = visit.follow_up_title()
         visit_form = VisitDetailForm(instance=visit)
         visits_data.append((visit_form, appointments, finished, visit_id, visit_title))
+        if not visit.is_finished:
+            allow_add_visit = False
 
-    return wrap_response(request, 'subjects/visitdetails.html', {'display': visits_data, "id": id})
+    return wrap_response(request, 'subjects/visitdetails.html',
+                         {'display': visits_data, "id": id, "allow_add_visit": allow_add_visit})