fix: Allow for later adding of django CMS versioning

Author: fsbraun

README.rst

@@ -89,11 +89,17 @@ please set ``DJANGOCMS_SNIPPET_CACHE`` to ``False`` in your settings::
 
     DJANGOCMS_SNIPPET_CACHE = False # default value is False
 
-Migration 0010 requires the use of a user in order to create versions for existing snippets (if djangocms_versioning is installed and enabled),
-a user can be chosen with the setting ``DJANGOCMS_SNIPPET_VERSIONING_MIGRATION_USER_ID``, the default is 1.
-This setting is also exposed as an Environment variable for Divio projects using the Divio addon.
+django CMS 4 and later
+----------------------
 
-    DJANGOCMS_SNIPPET_VERSIONING_MIGRATION_USER_ID = 2 # Will use user with id: 2
+If you use djangocms-versioning or djangocms-moderation, you can have snippets versioned and moderated by
+adding the following to your settings::
+
+    DJANGOCMS_SNIPPET_VERSIONING = True  # Set to version with djangocms-versioning
+    DJANGOCMS_SNIPPET_MODERATION = True  # Set to moderate with djangocms-moderation
+
+When adding versioning to djangocms-snippets, you will need to create ``Version``objects using
+djangocms-versioning's ``create_version`` management command.
 
 Template tag
 ------------
@@ -119,7 +125,8 @@ Optionally provide a fallback if there is no matching id/slug/instance::
 Known Issues
 ------------
 
-When adding a snippet with the `object` or `embed` tag as root element, the CMS toolbar crashes, making any further editing of the page difficult or impossible. A workaround is to just put those elements inside a `div` tag.
+When adding a snippet with the `object` or `embed` tag as root element, the CMS toolbar crashes, making any further
+editing of the page difficult or impossible. A workaround is to just put those elements inside a `div` tag.
 
 
 Running Tests

src/djangocms_snippet/migrations/0010_cms4_grouper_version_data_migration.py

@@ -1,65 +1,25 @@
-from django.apps import apps as global_apps
-from django.conf import settings
-from django.contrib.contenttypes.management import create_contenttypes
 from django.db import migrations
 
 
-try:
-    from djangocms_versioning.constants import DRAFT, PUBLISHED
-
-    djangocms_versioning_installed = True
-except ImportError:
-    djangocms_versioning_installed = False
-
-djangocms_versioning_config_enabled = getattr(
-    settings, 'DJANGOCMS_SNIPPET_VERSIONING_ENABLED', True
-)
-
-
 def cms4_grouper_version_migration(apps, schema_editor):
-    create_contenttypes(global_apps.get_app_config("djangocms_snippet"))
-
+    db_alias = schema_editor.connection.alias
 
-
-    ContentType = apps.get_model('contenttypes', 'ContentType')
     Snippet = apps.get_model('djangocms_snippet', 'Snippet')
     SnippetGrouper = apps.get_model('djangocms_snippet', 'SnippetGrouper')
-    User = apps.get_model(*settings.AUTH_USER_MODEL.split('.'))
-
-    snippet_contenttype = ContentType.objects.get(app_label='djangocms_snippet', model='snippet')
-    snippet_queryset = Snippet.objects.all()
 
-    # Get a migration user to create a version.
-    if djangocms_versioning_config_enabled and djangocms_versioning_installed and len(snippet_queryset):
-        Version = apps.get_model('djangocms_versioning', 'Version')
-        migration_user = User.objects.get(id=getattr(settings, "DJANGOCMS_SNIPPET_VERSIONING_MIGRATION_USER_ID", 1))
+    snippet_queryset = Snippet.objects.using(db_alias).all()
 
     for snippet in snippet_queryset:
         grouper = SnippetGrouper.objects.create()
         snippet.snippet_grouper = grouper
         snippet.save()
 
-        # Create initial Snippet Versions if versioning is enabled and installed.
-        # Publish the snippet because all snippets were assumed published before
-        if djangocms_versioning_config_enabled and djangocms_versioning_installed:
-            Version.objects.create(
-                created_by=migration_user,
-                state=PUBLISHED,
-                number=1,
-                object_id=snippet.pk,
-                content_type=snippet_contenttype,
-            )
-
 
 class Migration(migrations.Migration):
     dependencies = [
-        # ('cms', '0034_remove_pagecontent_placeholders'),  # Run after the CMS4 migrations
         ('djangocms_snippet', '0009_auto_20210915_0445'),
     ]
 
-    if djangocms_versioning_installed:
-        dependencies += [('djangocms_versioning', '0015_version_modified'), ]
-
     operations = [
         migrations.RunPython(cms4_grouper_version_migration)
     ]