Dump a postgresql production database excluding migrations; and restore locally

production.rake

namespace :production do
  task sync: :environment do |t, args|
    user_at_host = 'ubuntu@aws-host.com'
    user_keypair = '-i ~/.ec2/gsg-keypair'
    filename     = Time.now.strftime "production_dump_%Y-%m-%d_%H-%M-%S.psql"
    dump_path    = "/tmp/#{filename}"
    project      = 'project'

    # Dumping the table (excluding schema_migrations) on the server.
    dump_command = ["pg_dump --exclude-table=schema_migrations",
                    "-a -F c -v -U postgres -h localhost #{project}_production",
                    "-f #{dump_path}"].join(' ')
    sh "ssh #{user_keypair} #{user_at_host} '#{dump_command}'"

    # Copying the dump file locally to #{dump_path}
    sh "scp #{user_keypair} #{user_at_host}:#{dump_path} #{dump_path}"

    # Dropping, creating, and migrating the database via Rake
    Rake::Task["db:drop"].invoke
    Rake::Task["db:create"].invoke
    Rake::Task["db:migrate"].invoke

    # Restoring the dump file
    sh "pg_restore -c -C -F c -v -U #{project} -d #{project}_development #{dump_path}"
  end
end