Paperclip image upload store nil and display missing image - ruby-on-rails

Question

I am using Paperclip to upload an image and display in a pin. But it display a missing image and the pin stores null value for image properties. I have gone through different post here but still unable to fix it.
<Pin id: 7, description: "Hello", created_at: "2016-08-14 20:13:10", updated_at: "2016-08-14 20:13:10",user_id: 2, image_file_name: nil, image_content_type: nil, image_file_size: nil, image_updated_at: nil>
pin model
class Pin < ActiveRecord::Base
belongs_to :user
has_attached_file :image
validates_attachment :image, content_type: { content_type: ["image/jpg",
"image/jpeg", "image/png", "image/gif"] }
end
pins controller
class PinsController < ApplicationController
before_action :set_pin, only: [:show, :edit, :update, :destroy]
before_action :correct_user, only: [:edit, :update, :destroy]
before_action :authenticate_user!, except: [:index, :show]
def index
#pins = Pin.all
end
def show
end
def new
#pin = current_user.pins.build
end
def edit
end
def create
#pin = current_user.pins.build(pin_params )
respond_to do |format|
if #pin.save
format.html { redirect_to #pin, notice: 'Pin was successfully created.' }
format.json { render :show, status: :created, location: #pin }
else
format.html { render :new }
format.json { render json: #pin.errors, status: :unprocessable_entity }
end
end
end
def update
respond_to do |format|
if #pin.update(pin_params)
format.html { redirect_to #pin, notice: 'Pin was successfully updated.' }
format.json { render :show, status: :ok, location: #pin }
else
format.html { render :edit }
format.json { render json: #pin.errors, status: :unprocessable_entity }
end
end
end
def destroy
#pin.destroy
respond_to do |format|
format.html { redirect_to pins_url, notice: 'Pin was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_pin
#pin = Pin.find(params[:id])
end
def correct_user
#pin = current_user.pins.find_by(id: params[:id])
redirect_to pins_path, notice: "Unauthorized to edit" if #pin.nil?
end
# Never trust parameters from the scary internet, only allow the white list through.
def pin_params
params.require(:pin).permit(:description, :image)
end
end
View
<%= form_for #pin, html: {multipart: true} do |f| %>
<% if #pin.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(#pin.errors.count, "error") %> prohibited this pin from being saved:</h2>
<ul>
<% #pin.errors.full_messages.each do |message| %>
<li><%= message %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="col-sm-8">
<div class="form-horizontal">
<div class="form-group">
<div class="field">
<%= f.label :image , class: "col-sm-3 control-label" %>
<div class="col-sm-5"><%= f.file_field :image , class: "form-control" %>
</div>
</div>
</div>
<div class="form-group">
<div class="field">
<%= f.label :description , class: "col-sm-3 control-label" %>
<div class="col-sm-5"><%= f.text_field :description , class: "form-control" %>
</div>
</div>
</div>
<div class="form-group">
<div class="actions">
<div class="col-sm-3"></div>
<div class="col-sm-5">
<%= f.submit class: "btn btn-danger" %>
</div>
</div>
</div>
</div>