json - Append HTTP verb -

i have (json for) resource @ /api/foo/1/

{name: "foo", bar_pks: [10, 11, 12]}

now want add api appending bar_pks. there no http verb appending can find. if patch /api/foo/1/ {bar_pks: [13]}, overwrite, not append.

1. is there verb more consistent appending?
2. if modify patch resource append, come bite me later?

(i using django , tastypie, prefer language agnostic answer.)

is there compelling reason not append on client side , use put/patch send updated value server?

i see couple of options if you're dead-set on doing this:

1. a post new uri gets interpreted append list.
2. a query parameter on patch indicates changes should appended rather overwrite.

neither of these options, , not endorse using them.