Make base_url an optional argument for cloning

pagetree/forms.py

@@ -1,6 +1,7 @@
 from __future__ import unicode_literals
 
 from django import forms
+from django.utils.text import slugify
 from treebeard.forms import movenodeform_factory
 from pagetree.models import Hierarchy, Section
 
@@ -16,10 +17,17 @@ class Media:
         }
         js = ('pagetree/js/src/clone-loading.js',)
 
+    base_url = forms.CharField(
+        required=False, label='Base URL (optional)')
+
     def clean(self):
         cleaned_data = super(CloneHierarchyForm, self).clean()
         name = cleaned_data.get('name')
         base_url = cleaned_data.get('base_url')
+        if not base_url:
+            # If there's no base_url, derive it from the name.
+            cleaned_data['base_url'] = slugify(name)
+            base_url = cleaned_data['base_url']
 
         if Hierarchy.objects.filter(name=name).exists():
             raise forms.ValidationError(

pagetree/templates/pagetree/clone_hierarchy.html

@@ -29,6 +29,7 @@ <h1>Clone {{ hierarchy.name }}</h1>
             <p class="help-block">
                 The Base URL field will be used as part of the clone's
                 URL. This should be something like: <code>my-clone</code>
+                If left blank, it will be derived from the name.
             </p>
         </form>
     </div>

pagetree/tests/test_forms.py

@@ -22,6 +22,18 @@ def test_clean(self):
         self.assertEqual(new_hier.name, 'new name')
         self.assertEqual(new_hier.base_url, 'new')
 
+    def test_clean_no_base_url(self):
+        h = HierarchyFactory()
+        f = CloneHierarchyForm({
+            'name': 'new name',
+            'base_url': '',
+        },
+                               instance=h)
+        self.assertTrue(f.is_valid())
+        new_hier = f.save()
+        self.assertEqual(new_hier.name, 'new name')
+        self.assertEqual(new_hier.base_url, 'new-name')
+
     def test_clean_prevents_duplicate_name(self):
         h = HierarchyFactory()
         f = CloneHierarchyForm({