better_circleci.bundle_install.yml

bundle_install:
  description: Bundle Install
  steps:
    - run:
        name: Expire cache key every month
        command: date '+%Y %m' > ~/voom/dependency_checksum

    - restore_cache:
        keys:
          - v1-bundle-{{ arch }}-{{ checksum "~/voom/dependency_checksum" }}-{{ checksum "~/voom/Gemfile.lock" }}
          - v1-bundle-{{ arch }}-{{ checksum "~/voom/dependency_checksum" }}
          - v1-bundle-{{ arch }}-

    - run:
        name: Install Bundler
        command: gem install bundler -v 1.17.3

    - run:
        name: Bundle Install
        command: cd ~/voom/; bundle check || bundle install --frozen --without production --without staging

    - save_cache:
        key: v1-bundle-{{ arch }}-{{ checksum "~/voom/dependency_checksum" }}-{{ checksum "~/voom/Gemfile.lock" }}
        paths:
          - ~/voom/vendor/bundle