Add a migration to create a Licence if none exists

docs/ubuntu.md

@@ -95,15 +95,6 @@ remember to rerun this command if you open a new terminal window.*
 
     umap runserver 0.0.0.0:8000
 
-## Add at least one license
-
-Go to [http://localhost:8000/admin/leaflet_storage/licence/add/](http://localhost:8000/admin/leaflet_storage/licence/add/) and create
-a new Licence object.
-For example:
-
-- name: `ODbL`
-- URL: `http://opendatacommons.org/licenses/odbl/`
-
 You can now go to [http://localhost:8000/](http://localhost:8000/) and try to create a map for testing.
 
 When you're done with testing, quit the demo server (type Ctrl-C).

umap/migrations/0002_add_licence.py

@@ -0,0 +1,25 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.3 on 2016-11-26 16:11
+from __future__ import unicode_literals
+
+from django.db import migrations
+
+
+def add_licence(apps, *args):
+    Licence = apps.get_model('leaflet_storage', 'Licence')
+    if Licence.objects.count():
+        return
+    Licence(
+        name='ODbL',
+        details='http://opendatacommons.org/licenses/odbl/').save()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('umap', '0001_add_tilelayer'),
+    ]
+
+    operations = [
+        migrations.RunPython(add_licence),
+    ]