Platform.role.readField

Call as

Platform.role.readField(self, object, key)

Record the dependency Platform.role.readField, then call it by that name. A namespaced call does not pass self: use a colon call or pass the object yourself.

What it does

Reads object[key] in protected mode, used to look up optional APIs. Returns the value (possibly nil), or nil with "restricted-value" when the object or the value is secret, "invalid-api-result" when object is not a table, or "api-error" when indexing raises an error.

Arguments

Returns

Editions

Built In helpers are registered on every edition. What differs is the game API they read; where one is missing the helper falls back or returns nil with a reason.

It reads no game API directly.

Secret values (Retail and Forever)

On Retail and Forever the game hands addons secret values. This helper checks what it reads (addon.Platform:CanReadValue) and returns nil with a reason such as restricted-value instead of a secret it cannot compare. Treat nil as unavailable, not as false.

How the addon calls it

• Platform.role.GetInspectRoleObservation

  local namespace,reason=readField(self,_G,'C_SpecializationInfo')

• Platform.role.GetTalentGroupRoleObservation

  local query,reason=readField(self,_G,'GetTalentGroupRole')

Source

Platform/role.lua, line 19. Read only in game; Duplicate makes an editable copy.

    if not self:CanReadValue(object) then return nil,'restricted-value' end
    if type(object)~='table' then return nil,'invalid-api-result' end
    local ok,value=pcall(function() return object[key] end)
    if not ok then return nil,'api-error' end
    if not self:CanReadValue(value) then return nil,'restricted-value' end
    return value