gmodlua

plys = {}

for k, v in pairs(player.GetAll()) do
    plys[k] = v
end

for k, v in pairs(plys) do
    print(v:GetName() ..  " : " .. v:GetModel())
    v:SetModel("models/player/Doncon/doncon.mdl")
    print(v:GetName() ..  " : " .. v:GetModel())
end