Question

I have a piece of code that enables or disables selection lists when the appropriate checkbox is clicked, however if they are all disabled on post it will not send these in a the params list. So I need to execute code only if they exist.

I’ve used:

if params[:id][:id2].nil?

and

if params[:id][:id2].blank?

also

if params[:id][:id2].empty?

not to mention simply:

if params[:id][:id2]

And all give the same error…”You have a nil object where you weren’t expecting it.” How can I fix this error?

Answer 1

Probably params[:id] is nil, check for params[:id].nil?.

EDIT: The comments below state correctly that blank? is better if you seek to evaluate against either nil? or empty?.