html - How do I save images via options_for_select with Paperclip and Image Picker on Rails 4? -

i'm trying save images via form populates "select" field number of options. select form uses image picker change options when user clicks on selected image. when form submitted, selected image should saved paperclip gem.

i think need point image url selected option method open in paperclip, i'm not quite sure how that. i'm new rails, , humbly appreciate point me in right direction!

here's have:

_form.html.erb

<%= f.select( :medium_id,               options_for_select(@story.fetched_images.collect{ |v,i| [v, @story.fetched_images.index(v), 'data-img-src' => v ] } )) %> 

if use ":medium", when setting form input, error says "activerecord::associationtypemismatch @ /stories medium(#70334728193840) expected, got string(#70334669736760)", have tried using ":medium_id", displays value of selected option instead of url.

using ":medium_id" allows rest of form fields save without error, option value saved image, not image itself.

story.rb

class story < activerecord::base  belongs_to :medium  accepts_nested_attributes_for :medium 

stories_controller.rb

class storiescontroller < applicationcontroller  def new     @title = "submit story"     @cur_url = "/stories/new"       @story = story.new     @story.build_medium end  private  def story_params     p = params.require(:story).permit(   :title, :url, :description, :moderation_reason, :seen_previous,   :merge_story_short_id, :is_unavailable, :medium, :medium_id, :tags_a => [], medium_attributes: [:medium, :image], ) 

medium.rb

require "open-uri"  class medium < activerecord::base  has_one :story  before_save :image_from_select      def image_from_select(url)         self.image = open(url)     end  end 

media_controller.rb

def create     @medium = medium.new(medium_params)      respond_to |format|       if @medium.save         format.html { redirect_to @medium, notice: 'medium created.' }         format.json { render action: 'show', status: :created, location: @medium }       else         format.html { render action: 'new' }         format.json { render json: @medium.errors, status: :unprocessable_entity }       end     end   end  private  def set_medium   @medium = medium.find(params[:id]) end   def medium_params   params.require[:medium].permit(:image) end 

end

schema.rb

create_table "stories", force: true |t|   t.integer  "medium_id" end    create_table "media", force: true |t|     t.datetime "created_at"     t.datetime "updated_at"     t.string   "image_file_name"     t.string   "image_content_type"     t.integer  "image_file_size"     t.datetime "image_updated_at"     t.integer  "story_id"   end 

i have tried referencing following without success:

save image url paperclip which proper way upload image external url paperclip on rails 4? http://runnable.com/unsmh7fyn2v6aaat/how-to-save-images-by-url-with-paperclip-for-ruby-on-rails-and-upload https://github.com/thoughtbot/paperclip/wiki/attachment-downloaded-from-a-url

thanks in advance.