Contents

module IdentityCache
  module BelongsToCaching

    def self.included(base)
      base.send(:extend, ClassMethods)
      base.class_attribute :cached_belongs_tos
    end

    module ClassMethods
      def cache_belongs_to(association, options = {})
        self.cached_belongs_tos ||= {}
        self.cached_belongs_tos[association] = options

        options[:embed] ||= false
        options[:cached_accessor_name] ||= "fetch_#{association}"
        options[:foreign_key] ||= reflect_on_association(association).foreign_key
        options[:associated_class] ||= reflect_on_association(association).class_name

        if options[:embed]
          raise NotImplementedError
        else
          build_normalized_belongs_to_cache(association, options)
        end
      end

      def build_normalized_belongs_to_cache(association, options)
        self.class_eval(ruby = <<-CODE, __FILE__, __LINE__)
          def #{options[:cached_accessor_name]}
            if IdentityCache.should_cache? && #{options[:foreign_key]}.present? && !association(:#{association}).loaded?
              self.#{association} = #{options[:associated_class]}.fetch_by_id(#{options[:foreign_key]})
            else
              #{association}
            end
          end
        CODE
      end
    end
  end
end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
identity_cache-0.0.2	lib/belongs_to_caching.rb
identity_cache-0.0.1	lib/belongs_to_caching.rb