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# frozen_string_literal: true
module CacheConcern
extend ActiveSupport::Concern
def render_with_cache(**options)
raise ArgumentError, 'only JSON render calls are supported' unless options.key?(:json) || block_given?
key = options.delete(:key) || [[params[:controller], params[:action]].join('/'), options[:json].respond_to?(:cache_key) ? options[:json].cache_key : nil, options[:fields].nil? ? nil : options[:fields].join(',')].compact.join(':')
expires_in = options.delete(:expires_in) || 3.minutes
body = Rails.cache.read(key, raw: true)
if body
render(options.except(:json, :serializer, :each_serializer, :adapter, :fields).merge(json: body))
else
if block_given?
options[:json] = yield
elsif options[:json].is_a?(Symbol)
options[:json] = send(options[:json])
end
render(options)
Rails.cache.write(key, response.body, expires_in: expires_in, raw: true)
end
end
def set_cache_headers
# TODO: Uncomment the following line if and when public_fetch_mode exists
# response.headers['Vary'] = public_fetch_mode? ? 'Accept' : 'Accept, Signature'
response.headers['Vary'] = 'Accept'
end
def cache_collection(raw, klass)
return raw unless klass.respond_to?(:with_includes)
raw = raw.cache_ids.to_a if raw.is_a?(ActiveRecord::Relation)
cached_keys_with_value = Rails.cache.read_multi(*raw).transform_keys(&:id)
uncached_ids = raw.map(&:id) - cached_keys_with_value.keys
klass.reload_stale_associations!(cached_keys_with_value.values) if klass.respond_to?(:reload_stale_associations!)
unless uncached_ids.empty?
uncached = klass.where(id: uncached_ids).with_includes.each_with_object({}) { |item, h| h[item.id] = item }
uncached.each_value do |item|
Rails.cache.write(item, item)
end
end
raw.map { |item| cached_keys_with_value[item.id] || uncached[item.id] }.compact
end
end
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