Rails - May 2014 - Refactor question

Hi,

I'm trying to refactor some code..

      if session[:image_subject_id].blank?
        if @profile.image_subject_id.blank?
          session[:image_subject_id] = nil
        else
          session[:image_subject_id] = @profile.image_subject_id
        end
      end

      if session[:image_subject_id].blank?
        if @profile.image_book_id.blank?
          session[:image_book_id]  = nil
        else
          session[:image_book_id] = @profile.image_book_id
        end
      end
       ...
       ...
       ...

Trying the following:

["image_subject_id", "image_book_id",
"image_chapter_id",
"image_section_id""image_subsection_id",
"image_minisection_id"].each do
|k|

          if session[":#{k.to_s}"].blank?
            if @profile.k.blank?
              session[":#{k.to_s}"] = nil
            else
              session[":#{k.to_s}"] = @profile.k
            end
          end
 end

Problem is @profile.k gives error NoMethodError: undefined method `k'
for #<Profile:0x00000106da5e60>

k does evaluate to  "image_subject_id", so not sure what is wrong...

Thanks

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