Fetch and process multi

Fetches data from the cache, using the given ids and ids_to_keys_proc.

If there is data in the cache with the given keys, then that data is returned.

Otherwise, the supplied block is called for ids for which there was no data, and the result will be written to the cache and returned as ids -> values hash.

Ids can be any even composite identifiers.

Options are passed to the underlying cache implementation.

Returns hash of id -> value of passed ids.

def ids_to_keys(ids)
  ids.each_with_object({}) do |id, memo|
    memo[id] = "key_base/id_#{id}"
  end
end

cache.write("key_for_1", "value_for_1")

cache.fetch_and_process_multi(ids_to_keys([1, 2]) do |uncached_ids|
  uncached_ids.each_with_object({}) do |id, memo|
    memo[id] = "fallback_value_for_#{id}"
  end
end

# => { 1 => "value_for_1", 2 => "fallback_value_for_2" }

Installation

Add this line to your application's Gemfile:

gem 'fetch-process-multi'

And then execute:

bundle

Or install it yourself as:

gem install fetch-process-multi

Development

After checking out the repo, run bin/setup to install dependencies. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install.

To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/astrauka/fetch-process-multi.