public function generateAddedFields()
    {
        foreach ($this->keptModelKeys as $modelName) {
            $oldFieldKeys = $this->oldFieldKeys[$modelName];
            $newFieldKeys = $this->newFieldKeys[$modelName];

            $addedFields = array_diff($newFieldKeys, $oldFieldKeys);

            foreach ($addedFields as $addedField) {
                $this->findAddedFields($modelName, $addedField);
            }
        }
    }