Clearing a column is as easy as sending a “” to it, don’t forget to JSON.stringify it.
Except for long-text and people column where you need to send {} 🙁
That was until recently. Somewhere beginning of March the people column can’t be cleared in this way. You need to do a column mutation:
mutation {
change_column_value(
board_id: 1111111111,
item_id: 1122334455,
column_id: "person",
value: "{\\"removed_person_or_team\\":{\\"id\\":12345678,\\"kind\\":\\"person\\"},\\"persons_and_teams\\":e{\\"id\\":12345678,\\"kind\\":\\"person\\"}]}"
) {
id
}
}
EDIT: luckily there is another (undocumented) way to clear completely:
mutation {
change_column_value(
board_id: 1234567,
item_id: 112233445566,
column_id: "people",
value: "{\\"clear_all\\": true}"
) {
id
}
}