carrierwave image not showing after upload - ruby-on-rails

Question

so, I used CarrierWave gem and followed a railscast demo to get it working, but the image doesn't show on my listing show page.
here's the code on the show page:
<p id="notice"><%= notice %></p>
<p>
<strong>Description:</strong>
<%= #listing.description %>
</p>
<p>
<strong>Price $:</strong>
<%= #listing.price %>
</p>
<p>
<strong>Subcategory:</strong>
<%= Subcategory.find(#listing.subcategory_id).subcategory_name %>
</p>
<p>
<strong>Choose an image to upload:</strong>
<%= image_tag #listing.image_url(:half).to_s %>
</p>
<%= link_to 'Edit', edit_listing_path(#listing) %> |
<%= link_to 'Back', listings_path %> |
<%= link_to 'Home', root_path %>
and here's the controller:
class ListingsController < ApplicationController
before_action :set_listing, only: [:show, :edit, :update, :destroy]
before_action :set_options, only: [:new, :edit, :update, :create]
# GET /listings
# GET /listings.json
def search
if params[:category_id].present?
#category = Category.find(params[:category_id])
#subcategory = nil
elsif params[:subcategory_id].present?
#subcategory = Subcategory.find(params[:subcategory_id])
#category = Category.find(#subcategory.category_id)
end
end
def index
#listings = Listing.all
end
# GET /listings/1
# GET /listings/1.json
def show
end
# GET /listings/new
def new
#listing = Listing.new
end
# GET /listings/1/edit
def edit
end
# POST /listings
# POST /listings.json
def create
#listing = Listing.new(listing_params)
respond_to do |format|
if #listing.save
format.html { redirect_to #listing, notice: 'Listing was successfully created.' }
format.json { render :show, status: :created, location: #listing }
else
format.html { render :new }
format.json { render json: #listing.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /listings/1
# PATCH/PUT /listings/1.json
def update
respond_to do |format|
if #listing.update(listing_params)
format.html { redirect_to #listing, notice: 'Listing was successfully updated.' }
format.json { render :show, status: :ok, location: #listing }
else
format.html { render :edit }
format.json { render json: #listing.errors, status: :unprocessable_entity }
end
end
end
# DELETE /listings/1
# DELETE /listings/1.json
def destroy
#listing.destroy
respond_to do |format|
format.html { redirect_to listings_url, notice: 'Listing was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_listing
#listing = Listing.find(params[:id])
end
def set_options
#options_for_select_ary = Subcategory.all.collect {|subcategory| [ subcategory.subcategory_name, subcategory.id ] }
end
# Never trust parameters from the scary internet, only allow the white list through.
def listing_params
params.require(:listing).permit(:id, :description, :price, :subcategory_id)
end
end
and finally the model:
class Listing < ApplicationRecord
attr_accessor :image, :remote_image_url
belongs_to :category, optional: true
belongs_to :subcategory, optional: true
belongs_to :delivery, optional: true
belongs_to :user, optional: true
mount_uploader :image, AvatarUploader
end
so, my question is, how do I get the image to show up in the listing once it's been created?
I can add in my AvatarUploader class in an edit if you need to see the carrierwave code....