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impress/app/models/item/proxy.rb

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1.6 KiB
Ruby

class Item
class Proxy
include FragmentLocalization
attr_reader :id
attr_writer :item, :owned, :wanted
delegate :description, :name, :nc?, :thumbnail_url, to: :item
def initialize(id)
@id = id
@known_outputs = {method: {}, partial: {}}
end
def as_json(options={})
cache_method(:as_json, include_hanger_status: false).tap do |json|
json[:owned] = owned?
json[:wanted] = wanted?
end
end
def cached?(type, name)
# TODO: is there a way to cache nil? Right now we treat is as a miss.
# We eagerly read the cache rather than just check if the value exists,
# which will usually cut down on cache requests.
@known_outputs[type][name] ||= Rails.cache.read(fragment_key(type, name))
!@known_outputs[type][name].nil?
end
def owned?
@owned
end
def to_partial_path
# HACK: could break without warning!
Item._to_partial_path
end
def wanted?
@wanted
end
private
def cache_method(method_name, *args, &block)
# Two layers of cache: a local copy, in case the method is called again,
# and then the Rails cache, before we hit the actual method call.
@known_outputs[method_name] ||= begin
key = fragment_key(:method, method_name)
Rails.cache.fetch(key) { item.send(method_name, *args) }
end
end
def item
@item ||= Item.find(@id)
end
def fragment_key(type, name)
prefix = type == :partial ? 'views/' : ''
base = localize_fragment_key("items/#{@id}##{name}", I18n.locale)
prefix + base
end
end
end