SignatureNotFound with fog-aws and carrierwave

I am using carrierwave and fog-aws while uploading a file to aws and storing the aws url in my local DB table.I have created carrierwave.rb file to config all fog-aws credentials.

begin
 CarrierWave.configure do |config|                      # required
 config.storage = :fog

 config.fog_credentials = {
  :provider               => 'AWS',       # required
  :aws_access_key_id      => 'Key_id',       # required
  :aws_secret_access_key  => 'access_key',       # required
  :region                 => 'us-west-2'  # o\tional, defaults to 'us-east-1'
  # :fog                   => 'host',
  # :endpoint               => 'host'
 }
 config.fog_directory  = 'my-images-server' # required
 # see https://github.com/jnicklas/carrierwave#using-amazon-s3
 # for more optional configuration
 config.fog_public     = true   # optional, defaults to true

My uploader file contains

class QueryUploader < CarrierWave::Uploader::Base
 storage :fog
 def store_dir
  base_dir = File.join(Rails.root, "public", "uploads")
  "#{base_dir}/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
 end
 def cache_dir
  "/tmp/service-quep"
 end
 def extension_white_list
   %w(sql)
 end
end

I read many articles and breaking my head from 2days, still could not find any solution.My access key is without space and bucket name is not trailing with a slash.Can anyone please tell why this

Expected(200) <=> Actual(403 Forbidden) excon.error.response :body => "\nSignatureDoesNotMatchThe request signature we calculated does not match the signature you provided. Check your key and signing method.YTUUYUDTDYJBKJNUFYD

error is coming.

Look, on this method you don't need to write extra code because of Rails directory mapping automatically like if you use "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}" then it automatically mapping /public/uploads/...

your code

def store_dir
    base_dir = File.join(Rails.root, "public", "uploads")
    "#{base_dir}/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
end

it will be

def store_dir
  "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
end

You can check this gist this is great for working with Rails, CarrierWave and AWS, also you can check this