uploading image or file in ruby on rails 4 -

here, want clear concept uploading file or image without using gemfile(ex: peperclip, carrierwave etc).

previously, did work. can upload images in "/assets/images" folder. could't see images when call in show page(there placeholder of break image). here screenshot of show page:

how can show images in show.html.erb file?

here imagescontroller.rb file:

class imagescontroller < applicationcontroller   before_action :set_image, only: [:show, :edit, :update, :destroy]    # /images   def index     @images = image.all   end    # /images/1   def show   end    # /images/new   def new     @image = image.new   end    # /images/1/edit   def edit   end    # post /images   def create     @image = image.new(image_params)     if params[:image].present?       file = params[:image][:picture]       file.open(rails.root.join('app','assets', 'images', file.original_filename), 'wb') |f|         f.write(file.read)       end     end      respond_to |format|       if @image.save         format.html { redirect_to @image, notice: 'image created.' }         format.json { render action: 'show', status: :created, location: @image }       else         format.html { render action: 'new' }         format.json { render json: @image.errors, status: :unprocessable_entity }       end      end   end     def update     respond_to |format|       if @image.update(image_params)         format.html { redirect_to @image, notice: 'image updated.' }         format.json { head :no_content }       else         format.html { render action: 'edit' }         format.json { render json: @image.errors, status: :unprocessable_entity }       end     end   end    # delete /images/1   def destroy     @image.destroy     respond_to |format|       format.html { redirect_to images_url }       format.json { head :no_content }     end   end    private     # use callbacks share common setup or constraints between actions.     def set_image       @image = image.find(params[:id])     end      # never trust parameters scary internet, allow white list through.     def image_params       params.require(:image).permit(:name)     end end 

here show.html.erb file:

<p><%= @image.name %></p>  <p><%= image_tag @image.picture %></p> 

here schema.rb file:

activerecord::schema.define(version: 20140725043842)    create_table "images", force: true |t|     t.string   "name"     t.string   "picture"     t.datetime "created_at"     t.datetime "updated_at"   end  end 

please tell me, if need more information project. please give me advice. want clear understand uploading image/file , show them without using gemfile.

you have upload images folder doesn't need precompiling show, assets do. try uploading them public folder.

also might want read asset pipeline , why aren't displaying:

http://guides.rubyonrails.org/asset_pipeline.html