Add a migration to create a TileLayer if none exists

docs/ubuntu.md

@@ -104,17 +104,6 @@ For example:
 - name: `ODbL`
 - URL: `http://opendatacommons.org/licenses/odbl/`
 
-## Add at least one tilelayer
-
-Go to [http://localhost:8000/admin/leaflet_storage/tilelayer/add/](http://localhost:8000/admin/leaflet_storage/tilelayer/add/) and create
-a new TileLayer object.
-
-For example:
-
-- name: `Positron`
-- URL template: `https://cartodb-basemaps-{s}.global.ssl.fastly.net/light_all/{z}/{x}/{y}.png`
-- attribution: `© [[http://www.openstreetmap.org/copyright|OpenStreetMap]] contributors, © [[https://carto.com/attributions|CARTO]]`
-
 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/0001_add_tilelayer.py

@@ -0,0 +1,29 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.3 on 2016-11-26 16:02
+from __future__ import unicode_literals
+
+from django.db import migrations
+
+
+def add_tilelayer(apps, *args):
+    TileLayer = apps.get_model('leaflet_storage', 'TileLayer')
+    if TileLayer.objects.count():
+        return
+    TileLayer(
+        name='Positron',
+        url_template=('https://cartodb-basemaps-{s}.global.ssl.fastly.net/'
+                      'light_all/{z}/{x}/{y}.png'),
+        attribution=('© [[http://www.openstreetmap.org/copyright|'
+                     'OpenStreetMap]] contributors, © '
+                     '[[https://carto.com/attributions|CARTO]]')).save()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('leaflet_storage', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.RunPython(add_tilelayer),
+    ]