Update kaehmy BaseRole

sikweb/custom_operations.py

@@ -0,0 +1,30 @@
+# contents of yourapp/migrations/custom_operations.py
+
+from django.db.migrations.operations.models import ModelOperation
+
+
+class AlterModelBases(ModelOperation):
+    reduce_to_sql = False
+    reversible = True
+
+    def __init__(self, name, bases):
+        self.bases = bases
+        super().__init__(name)
+
+    def state_forwards(self, app_label, state):
+        """
+        Overwrite a models base classes with a custom list of
+        bases instead, then force Django to reload the model
+        with this (probably completely) different class hierarchy.
+        """
+        state.models[app_label, self.name_lower].bases = self.bases
+        state.reload_model(app_label, self.name_lower)
+
+    def database_forwards(self, app_label, schema_editor, from_state, to_state):
+        pass
+
+    def database_backwards(self, app_label, schema_editor, from_state, to_state):
+        pass
+
+    def describe(self):
+        return "Update %s bases to %s" % (self.name, self.bases)