_import_headers.html

= f.input :mapping_#{somehow_indicate_this_is_@import_header[0]}, :as => :select, :collection => @mdm_defaults
%span= import_headers

listings_controller.rb

  def map_listing
    @mdm_defaults = Listing::MDM_DEFAULTS
    file_field = params[:map_listing][:file]
    session[:map_fields] = {}
    temp_path = File.join(Dir::tmpdir, "map_fields_#{Time.now.to_i}_#{$$}")
    File.open(temp_path, 'wb') do |f|
      f.write file_field.read
    end
    session[:map_fields][:file] = temp_path
    CSV.foreach(session[:map_fields][:file], { :headers => true, :return_headers => true }) do |row|
      @import_headers = row if row.header_row?
    end
    new_array = []
    @import_headers.to_hash.each_key {|k| new_array << k}
    @import_headers = new_array.compact!.collect {|h| h.downcase.tr(" ", "_").delete("^a-z0-9_").to_sym}
    session[:map_fields][:imported_headers] = @import_headers
    render
  end

map_listing.html

- title "Map and Import Headers"

= semantic_form_for :listing, :url => listings_path, :method => :post do |f|
  %ul#mappings= render :partial => 'import_headers', :collection => @import_headers, :locals => {:f => f}
  = f.buttons