Returns true when the collection is saved (has an id) and its protocol
advertises the given capability. Older backends that predate a capability
simply omit the flag, so a missing flag is treated as unsupported and the
associated control renders nothing — the admin and circulation manager can
deploy out of sync without breaking.
Returns true when the collection is saved (has an id) and its protocol advertises the given capability. Older backends that predate a capability simply omit the flag, so a missing flag is treated as unsupported and the associated control renders nothing — the admin and circulation manager can deploy out of sync without breaking.