def move_to_collection(self, source_collection, destination_collection):
        """Move entity from source to destination collection."""
        # Remove from collection.
        self.collections.remove(source_collection)  # pylint: disable=no-member
        source_collection.data.remove(*self.data.all())  # pylint: disable=no-member

        # Add to collection.
        self.collections.add(destination_collection)  # pylint: disable=no-member
        destination_collection.data.add(*self.data.all())
Move entity from source to destination collection.