require 'jsonpath' require 'json' module Looksist module Hashed extend ActiveSupport::Concern class << self; attr_accessor :redis_service end module ClassMethods def inject(opts) raise 'Incorrect usage' unless [:after, :using, :populate].all? { |e| opts.keys.include? e } after = opts[:after] @rules ||= {} (@rules[after] ||= []) << opts return if @rules[after].length > 1 define_method("#{after}_with_inject") do |*args| hash = send("#{after}_without_inject".to_sym, *args) self.class.instance_variable_get(:@rules)[after].each do |opts| if opts[:at].is_a? String hash = JsonPath.for(hash.with_indifferent_access).gsub!(opts[:at]) do |i| i.is_a?(Array) ? inject_attributes_for(i, opts) : inject_attributes_at(i, opts) end.to_hash.deep_symbolize_keys else inject_attributes_at(hash[opts[:at]], opts) end end hash end alias_method_chain after, :inject end end included do |base| base.class_attribute :rules end private def entity(entity_id) entity_id.to_s.gsub('_id', '') end def inject_attributes_at(hash_offset, opts) keys = hash_offset[opts[:using]] entity_name = entity(opts[:using]) values = Hashed.redis_service.send("#{entity_name}_for", keys) hash_offset[opts[:populate]] = values hash_offset end def inject_attributes_for(arry_of_hashes, opts) arry_of_hashes.each do |elt| key = elt[opts[:using]] entity_name = entity(opts[:using]) value = Hashed.redis_service.send("#{entity_name}_for", [key]) elt[opts[:populate]] = value.first end end end end