Problem with secure frame attributes

[Rainrider]

Hello,

I'm trying to bind a spell to middle click depending on player class from within the Factory function. Somehow it doesn't work. Here the code snippets:

oUF:Factory(function(self)
 
    local playerClass = cfg.playerClass
    local spellName
    
    if playerClass == "HUNTER" then
         spellName = GetSpellInfo(34477)    -- Misdirection
    elseif playerClass == "DRUID" then
        spellName = GetSpellInfo(29166)     -- Innervate
    elseif playerClass == "PALADIN" then
        spellName = GetSpellInfo(31789)     -- Righteous Defense
    elseif playerClass == "WARRIOR" then
        spellName = GetSpellInfo(3411)      -- Intervene
    elseif playerClass == "ROGUE" then
        spellName = GetSpellInfo(57934)     -- Tricks of the Trade
    elseif not spellName then
        spellName = "Misdirection"
    end
 
    self:SetActiveStyle("Rain")
    self:Spawn("player", "oUF_Rain_Player"):SetPoint("CENTER", -210, -215)
    self:Spawn("pet", "oUF_Rain_Pet"):SetPoint("BOTTOMLEFT", oUF_Rain_Player, "TOPLEFT", 0, 10)
    self:Spawn("focus", "oUF_Rain_Focus"):SetPoint("BOTTOMRIGHT", oUF_Rain_Player, "TOPRIGHT", 0, 10)
    self:Spawn("target", "oUF_Rain_Target"):SetPoint("CENTER", 210, -215)
    self:Spawn("targettarget", "oUF_Rain_TargetTarget"):SetPoint("BOTTOMRIGHT", oUF_Rain_Target, "TOPRIGHT", 0, 10)
    self:Spawn("focustarget", "oUF_Rain_FocusTarget"):SetPoint("BOTTOMLEFT", oUF_Rain_Target, "TOPLEFT", 0 , 10)
    
    if (cfg.showParty) then
        local party = self:SpawnHeader(
            "oUF_Rain_Party", nil, "solo,party,raid",
            "showParty", true,
            "showRaid", true,
            "showPlayer", true,
            "showSolo", true,
            "maxColumns", 4,
            "unitsPerColumn", 1,
            "columnAnchorPoint", "LEFT",
            "columnSpacing", 7.5,
            "oUF-initialConfigFunction", ([[
                self:SetWidth(110)
                self:SetHeight(22)
                self:SetAttribute("type3", "spell")
                self:SetAttribute("spell3", %s)
            ]]):format(spellName)
        )
        party:SetPoint("LEFT", UIParent, "BOTTOM", -231.25, 150)
        party:Show()
    end
...

I tested this on a druid, expecting to get Innervate or Misdirection if spellName and playerClass are not available. Instead I got nil. If I use self:SetAttribute("spell3", "Innervate") it works as expected. Is there an explanation for this? (Hopefully I typed it right )

I could also set the secure attributes from within the Shared function. Do I loose or gain something when doing so?

Thank you for your help
Rain