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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _build_models_query(self, query):
 """ Builds a query from `query` that filters to documents only from registered models. """

        registered_models_ct = self.build_models_list()
        if registered_models_ct:
            restrictions = [xapian.Query('%s%s' % (TERM_PREFIXES[DJANGO_CT], model_ct))
                            for model_ct in registered_models_ct]
            limit_query = xapian.Query(xapian.Query.OP_OR, restrictions)

            query = xapian.Query(xapian.Query.OP_AND, query, limit_query)

        return query