En route to #129.

subadd/templates/subadd/index.html

@@ -30,6 +30,7 @@ <h3>There are no database entries</h3>
    <div class="botnav">
      <a href="{% url 'subadd:add' %}">Add new substance</a>
      <a href="{% url 'subadd:add_sub_class' %}">Substance classes</a>
+     <a href="{% url 'subadd:edit_sub' %}">Edit Substance</a>
      <a href="/accounts/logout">Log out</a>
    </div>
   {% else %}

subadd/urls.py

@@ -10,5 +10,6 @@
     path('<int:substance_id>/', views.detail, name='detail'),
     path('add_class', views.add_sub_class, name='add_sub_class'),
     path('class_details/<int:class_id>/', views.sub_class_details, name='sub_class_details'),
+    path('edit', views.edit_sub, name='edit_sub'),
 ]
 

subadd/views.py

@@ -98,6 +98,31 @@ def addentry(request):
     return render(request, 'subadd/index.html', MiscMethods.add_header_info({'all_subs': Substance.objects.all()}))
 
 
+@login_required
+def edit_sub(request):
+    """
+    View provides the capability to edit a substance's details.
+
+    :param request:
+    :param substance_id:
+    :return:
+    """
+
+    if request.method != 'POST':
+        # substance = Substance.objects.get(pk=substance_id)
+        substance_form = Substance.objects.get(pk=request.POST['substance_id'])     # SubstanceForm
+
+        # substance_form = substance
+        context['substance_form'] = substance_form
+
+        return render(request, 'subadd/edit_sub.html', MiscMethods.add_header_info(context))
+
+    else:
+        context['substances'] = Substance.objects.all()
+
+        return render(request, 'subadd/edit_sub.html', MiscMethods.add_header_info(context))
+
+
 @login_required
 def detail(request, substance_id):
     """