accumulator.rb

resource_name :email_alias

property :address
property :recipients, Array

default_action :create


action :create do
  with_run_context :root do
    edit_resource(:template, "/tmp/aliases") do |new_resource|
      source 'aliases.erb'
      variables[:aliases] ||= {}
      variables[:aliases][new_resource.address] ||= []
      variables[:aliases][new_resource.address] += new_resource.recipients
      action :nothing
      delayed_action :create
    end
  end
end

recipe.rb

email_alias "thom" do
  address "thom"
  recipients %w{ foo bar baz }
end

email_alias "test" do
  address "test"
  recipients %w{ cat bodge baz }
end