fix migration chain

cookbook/migrations/0149_fix_leading_trailing_spaces.py

@@ -0,0 +1,31 @@
+from django.db import migrations, models
+from django_scopes import scopes_disabled
+models = ["Keyword", "Food", "Unit"]
+
+def update_paths(apps, schema_editor):
+    with scopes_disabled():
+        for model in models:
+            Node = apps.get_model("cookbook", model)
+            nodes = Node.objects.all().filter(name__startswith=" ")
+            for i in nodes:
+                i.name = "_" + i.name
+                i.save()
+            nodes = Node.objects.all().filter(name__endswith=" ")
+            for i in nodes:
+                i.name = i.name + "_"
+                i.save()
+
+
+def backwards(apps, schema_editor):
+    """nothing to do"""
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('cookbook', '0148_auto_20210813_1829'),
+    ]
+
+    operations = [
+        migrations.RunPython(update_paths, backwards),
+    ]