Class: SmartCollection::Mixin

Inherits:
Module
  • Object
show all
Defined in:
lib/smart_collection/mixin.rb

Defined Under Namespace

Modules: ClassMethods, InstanceMethods

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(raw_config) ⇒ Mixin

Returns a new instance of Mixin.



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# File 'lib/smart_collection/mixin.rb', line 31

def initialize raw_config
  @raw_config = raw_config
end

Instance Attribute Details

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'lib/smart_collection/mixin.rb', line 29

def config
  @config
end

Instance Method Details

#cached_scope(owner) ⇒ Object 



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# File 'lib/smart_collection/mixin.rb', line 39

def cached_scope owner
  @config.cache_manager.read_scope owner
end

#included(base) ⇒ Object 



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# File 'lib/smart_collection/mixin.rb', line 43

def included base
  @config = config = SmartCollection::Config.new(@raw_config)

  reflection_options = {smart_collection: config}
  if config.item_class_name
    reflection_options[:class_name] = config.item_class_name
  end

  base.include(InstanceMethods)
  base.extend(ClassMethods)

  if cache_class = CacheManager.determine_class(@raw_config)
    config.cache_manager = cache_class.new(model: base, config: config)
  end

  mixin_options = {
    name: config.items_name,
    scope: -> owner {
      if cache_manager = config.cache_manager
        unless cache_manager.cache_exists? owner
          owner.update_cache
        end
        cached_scope(owner)
      else
        uncached_scope(owner)
      end
    },
    type: :collection
  }

  case
  when cache_class == SmartCollection::CacheManager::CacheStore
    mixin_options[:preloader] = -> owners {
      owners.reject(&:cache_exists?).each(&:update_cache)
      loaded = config.cache_manager.read_multi(owners)
      records = config.item_class.where(id: loaded.values.flatten.uniq).map{|x| [x.id, x]}.to_h
      loaded.map do |owner, ids|
        [owner, ids.map{|x| records[x]}]
      end.to_h
    }
  when cache_class == SmartCollection::CacheManager::Table
    cached_name = "cached_#{config.items_name}".to_sym
    mixin_options[:preloader] = -> owners {
      owners.reject(&:cache_exists?).each(&:update_cache)
      Associationist.preload(owners, cached_items: config.item_name)
      owners.map do |owner|
        [owner, owner.cached_items.map{|item| item.send(config.item_name)}]
      end.to_h
    }
  else
    mixin_options[:preloader] = -> _ {
      raise RuntimeError, "Turn on cache to enable preloading."
    }
  end
  base.include Associationist::Mixin.new(mixin_options)

  base.validates_with SmartCollection::Validator

end

#uncached_scope(owner) ⇒ Object 



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# File 'lib/smart_collection/mixin.rb', line 35

def uncached_scope owner
  SmartCollection::ScopeBuilder.new(owner.rule, @config.item_class).build
end