Dualboot ruby app

Gemfile

if ENV['RAILS_NEXT']
  module Bundler::SharedHelpers
    def default_lockfile=(path)
      @default_lockfile = path
    end

    def default_lockfile
      @default_lockfile ||= Pathname.new("#{default_gemfile}.lock")
    end
  end

  Bundler::SharedHelpers.default_lockfile = Pathname.new("#{Bundler::SharedHelpers.default_gemfile}_next.lock")

  class Bundler::Dsl
    unless self.method_defined? :to_definition_unpatched
      alias_method :to_definition_unpatched, :to_definition
    end
    def to_definition(bad_lockfile, unlock)
      to_definition_unpatched(Bundler::SharedHelpers.default_lockfile, unlock)
    end
  end
end