remove data migration from 0010, create 0014 with optional data migration (does nothing if already migrated)

djangocms_blog/migrations/0010_auto_20150923_1151.py

@@ -4,37 +4,9 @@ from __future__ import unicode_literals
 import aldryn_apphooks_config.fields
 import app_data.fields
 import djangocms_text_ckeditor.fields
-from cms.models import Page
-from cms.utils.i18n import get_language_list
 from django.db import models, migrations
 
 
-def forwards(apps, schema_editor):
-    BlogConfig = apps.get_model('djangocms_blog', 'BlogConfig')
-    BlogConfigTranslation = apps.get_model('djangocms_blog', 'BlogConfigTranslation')
-    Post = apps.get_model('djangocms_blog', 'Post')
-    BlogCategory = apps.get_model('djangocms_blog', 'BlogCategory')
-    GenericBlogPlugin = apps.get_model('djangocms_blog', 'GenericBlogPlugin')
-    LatestPostsPlugin = apps.get_model('djangocms_blog', 'LatestPostsPlugin')
-    AuthorEntriesPlugin = apps.get_model('djangocms_blog', 'AuthorEntriesPlugin')
-    config = None
-    for page in Page.objects.drafts().filter(application_urls='BlogApp'):
-        config = BlogConfig.objects.create(namespace=page.application_namespace)
-        for lang in get_language_list():
-            title = page.get_title(lang)
-            translation = BlogConfigTranslation.objects.create(language_code=lang, master_id=config.pk, app_title=title)
-    if config:
-        for model in (Post, BlogCategory, GenericBlogPlugin, LatestPostsPlugin, AuthorEntriesPlugin):
-            for item in model.objects.all():
-                item.app_config = config
-                item.save()
-
-
-def backwards(apps, schema_editor):
-    # No need for backward data migration
-    pass
-
-
 class Migration(migrations.Migration):
 
     dependencies = [
@@ -120,5 +92,4 @@ class Migration(migrations.Migration):
             name='sites',
             field=models.ManyToManyField(to='sites.Site', help_text='Select sites in which to show the post. If none is set it will be visible in all the configured sites.', blank=True, verbose_name='Site(s)'),
         ),
-        migrations.RunPython(forwards, backwards)
     ]

djangocms_blog/migrations/0014_auto_20160215_1331.py

@@ -0,0 +1,43 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from cms.models import Page
+from cms.utils.i18n import get_language_list
+from django.db import migrations, models
+
+
+def forwards(apps, schema_editor):
+    BlogConfig = apps.get_model('djangocms_blog', 'BlogConfig')
+    BlogConfigTranslation = apps.get_model('djangocms_blog', 'BlogConfigTranslation')
+    Post = apps.get_model('djangocms_blog', 'Post')
+    BlogCategory = apps.get_model('djangocms_blog', 'BlogCategory')
+    GenericBlogPlugin = apps.get_model('djangocms_blog', 'GenericBlogPlugin')
+    LatestPostsPlugin = apps.get_model('djangocms_blog', 'LatestPostsPlugin')
+    AuthorEntriesPlugin = apps.get_model('djangocms_blog', 'AuthorEntriesPlugin')
+    config = None
+    for page in Page.objects.drafts().filter(application_urls='BlogApp'):
+        config, created = BlogConfig.objects.get_or_create(namespace=page.application_namespace)
+        if not BlogConfigTranslation.objects.exists():
+            for lang in get_language_list():
+                title = page.get_title(lang)
+                translation = BlogConfigTranslation.objects.create(language_code=lang, master_id=config.pk, app_title=title)
+    if config:
+        for model in (Post, BlogCategory, GenericBlogPlugin, LatestPostsPlugin, AuthorEntriesPlugin):
+            for item in model.objects.filter(app_config__isnull=True):
+                item.app_config = config
+                item.save()
+
+
+def backwards(apps, schema_editor):
+    # No need for backward data migration
+    pass
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('djangocms_blog', '0013_auto_20160201_2235'),
+    ]
+
+    operations = [
+        migrations.RunPython(forwards, backwards),
+    ]