Rails write_attribute failing

For some reason with the update to the latest Rails gem the write_attribute method has started to fail for me.

This Does Nothing

def index=(value)
write_attribute(:index, value)
end

def index
read_attribute(:index)
end

This Works

def index=(value)
self[:index] = value
end

def index
return self[:index]
end


Just thought I would share because I couldn't find anything about this on the web.