'Turn a sequence of (field, model, value) triples into an update query.
Used by add_update_values() as well as the "fast" update path when
saving models.'

def add_update_fields(self, values_seq):

    values_seq = [((value[0], value[1], force_text(value[2])) if isinstance(value[2], Promise) else value) for value in values_seq]
    self.values.extend(values_seq)
