how to update choices of field in change_view

[richar...@gmail.com]

hi There,

I have a field named A which has default choices, but when some filed named B was changed, i need to update the choices of filed A.

I have tried overried function get_form, formfield_for_choice_filed, none of them could update choice of A based on value of filed B.

Any help would be appreciated, thanks!