move join_fields to global function add data_cache for Model(),so that update will always update the data changed.(Model()._cache) cache will set as a copy of real data after each successful save
move join_fields to global function
add data_cache for Model(),so that update will always update the data
changed.(Model()._cache)
cache will set as a copy of real data after each successful save

hit9/skylark,hit9/skylark