Define alias methods

 * Add new alias for iteminfo

lib/ruby-dmm/response/item.rb

@@ -4,41 +4,25 @@
 module DMM
   class Response
     class Item
-      KEYS  = [
-        :affiliate_url,
-        :affiliate_url_sp,
-        :bandaiinfo,
-        :category_name,
-        :cdinfo,
-        :content_id,
-        :floor_name,
-        :image_url,
-        :isbn,
-        :jancode,
-        :maker_product,
-        :product_id,
-        :service_name,
-        :stock,
-        :title,
-        :url,
-        :url_sp,
-      ]
-      attr_reader *KEYS
-      alias :bandai_info  :bandaiinfo
-      alias :cd_info      :cdinfo
-      alias :images       :image_url
 
-      attr_reader *[
+      PREDEFINED_KEYS = [
         :date,
         :iteminfo,
-        :large_images,
         :list_price,
         :price,
         :price_all,
         :prices,
         :small_images,
       ]
-      alias :item_info    :iteminfo
+      attr_reader *PREDEFINED_KEYS
+      alias_method :item_info,  :iteminfo
+      alias_method :info,       :iteminfo
+
+      ALIAS_METHOD_MAP = {
+        :bandaiinfo => :bandai_info,
+        :cdinfo     => :cd_info,
+        :image_url  => :images,
+      }
 
       def initialize(item)
         item.each do |key, value|
@@ -53,14 +37,17 @@ def initialize(item)
           when :prices
             setup_prices(value) if value
           else
-            instance_variable_set("@#{key}", item[key])
             self.class.class_eval do
               unless method_defined?(key)
                 define_method "#{key}" do
                   instance_variable_get("@#{key}")
                 end
+                if name = ALIAS_METHOD_MAP[key.to_sym]
+                  alias_method name, key.to_sym
+                end
               end
             end
+            instance_variable_set("@#{key}", item[key])
           end
         end
       end

spec/response/item_spec.rb

@@ -7,13 +7,6 @@
     @item = DMM::new.item_list.result.items.first
   end
 
-  describe 'methods which returns integer' do
-    subject { @item }
-    DMM::Response::Item::KEYS.each do |key|
-      it { should respond_to(key) }
-    end
-  end
-
   describe '#images' do
     subject { @item.images }
     it { should be }
@@ -22,6 +15,16 @@
     its([:large]) { should == 'http://pics.dmm.com/mono/movie/n_616dlr22659/n_616dlr22659pl.jpg' }
   end
 
+  describe 'define alias methods' do
+    subject do
+      item = DMM::Response::Item::ALIAS_METHOD_MAP.keys.inject({}) {|h, key| h.merge(key => 1) }
+      DMM::Response::Item.new(item)
+    end
+    DMM::Response::Item::ALIAS_METHOD_MAP.values.each do |name|
+      it { should respond_to(name) }
+    end
+  end
+
   describe '#large_images' do
     subject do
       item = {