Cache content within your Lucky application.

1. Add the dependency to your shard.yml:

   dependencies:
     lucky_cache:
       github: luckyframework/lucky_cache

2. Run shards install

LuckyCache comes with a built-in MemoryStore, but if you need extneral storage, check out one of these adapters

• Redis Cache

require "lucky_cache"

LuckyCache.configure do |settings|
  settings.storage = LuckyCache::MemoryStore.new
  settings.default_duration = 5.minutes
end

class SomeObject
  include LuckyCache::Cachable
end

cache = LuckyCache.settings.storage
some_object = cache.fetch("some_key", as: SomeObject) do
  SomeObject.new
end

Use increment and decrement for counters. Each call is atomic, so no updates are lost when several fibers or threads change the same key.

cache = LuckyCache.settings.storage

cache.increment("visits")                       # => 1
cache.increment("visits", by: 5)                # => 6
cache.decrement("visits")                       # => 5
cache.increment("logins", expires_in: 1.minute) # => 1

A missing or expired key starts from 0 and expires after expires_in. An existing key keeps the expiration it already had.

You can cache portions of your page by including the LuckyCache::HtmlHelpers module in your Page class, and use the cache() helper method.

class Posts::ShowPage < MainLayout
  include LuckyCache::HtmlHelpers
  needs post : Post

  def content
    cache("post:#{post.id}:comments", expires_in: 1.hour) do
      post.comments.each do |comment|
        div comment.text
      end
    end
  end
end

1. Fork it (https://github.com/luckyframework/lucky_cache/fork)
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request

• Jeremy Woertink - maintainer

• Initial structure and some code was pulled from the original LuckyCache by @matthewmcgarvey.
• Lots of inspiration on Cache store was from @mamantoha