def _load_data(self, data, from_db=False):
self._data = data.copy()<EOL>self._data['<STR_LIT>'] = from_db<EOL>self._fill_nodes(self._data)<EOL>self._set_fields_values(self._data)<EOL>self._instantiate_linked_models(self._data)<EOL>del self._data['<STR_LIT>']<EOL>return self<EOL>
With the data returned from riak:
- fills model's fields, nodes and listnodes
- instantiates linked model instances

Args:
    from_db (bool): if data coming from db instead of calling
        self._set_fields_values() we simply use field's _load_data method.