- [Fixes GeoNode#905] Integrity db error between geoapps tables on up…

…grade from 3.x to 4.x

geonode_mapstore_client/migrations/0001_clean_prev_version_geoapps.py

@@ -0,0 +1,27 @@
+import json
+
+from django.contrib.contenttypes.models import ContentType
+from django.db import migrations
+
+remove_geostories_relation = "DROP TABLE IF EXISTS geoapp_geostories_geostory CASCADE;"
+remove_dashboards_relation = "DROP TABLE IF EXISTS geoapp_dashboards_dashboard CASCADE;"
+
+def update_geostory_dashboard_data(apps, _):
+    model = apps.get_model('base', 'ResourceBase')
+    for item in model.objects.filter(resource_type__in=['dashboard', 'geostory']):
+        if isinstance(item.blob, str):
+            new_blob = json.loads(item.blob)
+            model.objects.filter(id=item.id).update(blob=new_blob)
+        rtype = ContentType.objects.get(model="geoapp")
+        model.objects.filter(id=item.id).update(polymorphic_ctype=rtype)
+
+
+class Migration(migrations.Migration):
+
+    dependencies = []
+
+    operations = [
+        migrations.RunPython(update_geostory_dashboard_data, migrations.RunPython.noop),
+        migrations.RunSQL(remove_geostories_relation),
+        migrations.RunSQL(remove_dashboards_relation)
+    ]