Contents

# poorly-optimized, but handy, mixin for Hash and Model examples.
# primarily enables support for lazy values.

module Attributor

  module ExampleMixin

    def self.extended(obj)
      obj.class.attributes.each do |name, _|
        obj.define_singleton_method(name) do
          get(name)
        end
      end
    end

    def lazy_attributes
      @lazy_attributes ||= {}
    end

    def lazy_attributes=(val)
      @lazy_attributes = val
    end

    def keys
      @contents.keys | lazy_attributes.keys
    end

    def key?(key)
      @contents.key?(key) || lazy_attributes.key?(key)
    end

    def get(key, context: self.generate_subcontext(Attributor::DEFAULT_ROOT_CONTEXT,key))
      key = self.class.key_attribute.load(key, context)

      unless @contents.key? key
        if lazy_attributes.key?(key)
          proc = lazy_attributes.delete(key)
          @contents[key] = proc.call(self)
        end
      end

      super
    end

    def attributes
      lazy_attributes.keys.each do |name|
        self.__send__(name)
      end

      super
    end

    def contents
      lazy_attributes.keys do |key|
        proc = lazy_attributes.delete(key)
        @contents[key] = proc.call(self)
      end
      
      super
    end
  end

end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
attributor-2.5.0	lib/attributor/example_mixin.rb
attributor-2.4.0	lib/attributor/example_mixin.rb