Define respond_to_missing? when overriding method_missing

lib/ruby-box/item.rb

@@ -75,12 +75,12 @@ def method_missing(method, *args, &block)
       # Support has many and paginated has many relationships.
       return many(key) if @@has_many.include?(key)
       return paginated(key, args[0] || 100, args[1] || 0, args[2]) if @@has_many_paginated.include?(key)
-      
+
       # update @raw_item hash if this appears to be a setter.
       setter = method.to_s.end_with?('=')
       key = key[0...-1] if setter
       @raw_item[key] = args[0] if setter and update_fields.include?(key)
-      
+
       # we may have a mini version of the object loaded, fix this.
       reload_meta if @raw_item[key].nil? and has_mini_format?
 
@@ -93,6 +93,14 @@ def method_missing(method, *args, &block)
       end
     end
 
+    def respond_to_missing?(method, include_private = false)
+      method = method.to_s
+      key = method
+      key = key[0...-1] if method.end_with?('=')
+
+      @raw_item.key?(key) || @@has_many.include?(method) || @@has_many_paginated.include?(method) || super
+    end
+
     # see http://developers.box.com/docs/#folders-create-a-shared-link-for-a-folder
     # for a list of valid options.
     def create_shared_link(opts={})

spec/item_spec.rb

@@ -11,7 +11,7 @@
   end
 
   describe '#factory' do
-    
+
     it 'creates an object from a web_link hash' do
       web_link = RubyBox::Item.factory(@session, {
         'type' => 'web_link'
@@ -28,4 +28,27 @@
       banana.instance_of?(RubyBox::Item).should == true
     end
   end
+
+  describe '#respond_to?' do
+    let(:mixtape) { RubyBox::Item.factory(@session, { 'type' => 'mixtape', 'id' => '123' }) }
+
+    it 'should not respond to undefined keys' do
+      mixtape.should_not respond_to(:artist)
+    end
+
+    it 'should respond to methods that are delegated to the raw item' do
+      mixtape.should respond_to(:type)
+      mixtape.should respond_to(:id)
+    end
+
+    context "with relationships" do
+      before do
+        RubyBox::Item.has_many("tracks")
+      end
+
+      it 'should respond to relationship keys' do
+        mixtape.should respond_to(:tracks)
+      end
+    end
+  end
 end