mongoc_collection_keys_to_index_string man page

char *
mongoc_collection_keys_to_index_string (const bson_t *keys);

• keys: A bson_t.

This function returns the canonical stringification of a given key specification. See create-indexes.

It is a programming error to call this function on a non-standard index, such one other than a straight index with ascending and descending.

A string that should be freed with bson_free().

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