This rake task is used for downloading the Postgres databackup of a Heroku app. The Heroku db:pull doesn't seem to be working due to some taps gem versioning problem. Also this rake task works faster for restoring your databases from the Heroku pgbackups

pg_backups_data_transfer.rake

######################################################################################
#####    Copyright(C)  Koustubh Sinkar <ksinkar@gmail.com>                       #####
#####                                                                            #####
#####    This program is free software: you can redistribute it and/or modify    ##### 
#####    it under the terms of the GNU Lesser General Public License as          ##### 
#####    published by the Free Software Foundation, either version 2 of the      ##### 
#####    License, or (at your option) any later version.                         ##### 
#####                                                                            #####
#####      This program is distributed in the hope that it will be useful,       #####
#####    but WITHOUT ANY WARRANTY; without even the implied warranty of          #####
#####    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           #####
#####    GNU Lesser General Public License for more details.                     #####
#####                                                                            #####
#####      You should have received a copy of the GNU Lesser GPL                 ##### 
#####    along with this program.  If not, see <http://www.gnu.org/licenses/>.   #####
#####                                                                            #####
######################################################################################

require 'yaml'

namespace :heroku do

  def environment
    if Rails.respond_to?(:env)
      Rails.env
    else
      ENV["RAILS_ENV"] || ENV["RACK_ENV"] || "development"
    end
  end

  def config
    @config ||= begin
                  cfg = begin
                          cfg = YAML.load(ERB.new(IO.read("config/database.yml")).result)
                        rescue SyntaxError, StandardError
                          require APP_PATH
                          Rails.application.config.database_configuration
                        end
                  
                  unless cfg[environment]
                    abort "No database is configured for the environment '#{environment}'"
                  end
                  
                  cfg[environment]
                end
  end

  def run(command)
    puts  %x{#{command}}
    throw "PLEASE FIX #{command}" if $?.exitstatus != 0
  end

  namespace :pgbackups do
    desc "Download the pgbackups dump from heroku and restore it locally"
    task :pull, :app do |t, args| 
      heroku_app = args[:app]
      if config["adapter"] == 'postgresql'
        begin
          run("curl -o latest.dump `/usr/bin/heroku pgbackups:url --app #{heroku_app}`")
          ENV['PGUSER'] = config["username"] if config["username"]
          ENV['PGHOST'] = config["host"] if config["host"]
          ENV['PGPORT'] = config["port"].to_s if config["port"]
          ENV['PGPASSWORD'] = config["password"].to_s if config["password"]
          system("pg_restore --verbose --clean --no-acl --no-owner -h #{config['host']} -U #{config['username']} -d #{config['database']} latest.dump")
          run("rm latest.dump")
        rescue Exception => msg
          puts msg
        end
      else
        puts 'ONLY WORKS WITH POSTGRESQL DATABASES'
      end
    end
  end
end