Rails : simple_form : Getting an empty string from checkbox collection
I have the following code in my views
<%= f.input :role_names, as: :check_boxes, collection: @program.role_names %>
And whenever I submit the form I am getting values something like ["admin, "moderator", ""] but I was expecting something like ["admin, "moderator"] , why is this?
Moreover I made a inspect element, and there was a <input name="user[role_names][]" type="hidden" value=""> tag after the last check box, within the same control-group. I suppose this is getting added at the last in the params[:user][:recipient_role_names].
How should I handle this? I know I can do a reject(&:blank?) but is there a cleaner way on params[:user][:recipient_role_names]?
I also want to know why the input element is getting added? Is it a bug in simple form or I have done something wrong?
Other info:
- simple_form gem version: 2.0.4
- rails version: 3.2.8
Answer
It's a Rails' feature. You'll be able disable it in Rails 4. You can read more about this on simple form issue #603 and Rails issue #5402