Implemented find_by on association

lib/faceted/has_object.rb

@@ -75,7 +75,7 @@ def initialize_with_object
 
     def object
       return unless self.class.klass
-      @object ||= self.id ? self.class.klass.find(self.id) : self.class.klass.new
+      @object ||= self.class.klass.where(find_by => self.send(find_by)) || self.class.klass.new
     end
 
     def object=(obj)

lib/faceted/presenter.rb

@@ -24,6 +24,9 @@ def klass
       def presents(name, args={})
         class_name = args[:class_name] || name.to_s.classify
         @presents = eval(class_name)
+        define_method :find_by do
+          args[:find_by] || :id
+        end
         define_method :"#{class_name.downcase}" do
           object
         end

spec/presenter_spec.rb

@@ -14,6 +14,13 @@ def attributes; {:id => self.id, :city => self.city, :state => self.state}; end
   def reload; self; end
 end
 
+class Album # and yet another make-believe AR model
+  attr_accessor :id, :name
+  def initialize(params={}); params.each{|k,v| self.send("#{k}=",v) if self.respond_to?(k)}; end
+  def attributes; {:id => self.id, :name => self.name}; end
+  def reload; self; end
+end
+
 module MyApi
 
   class Birthplace
@@ -32,15 +39,21 @@ class Musician
     field :alive
   end
 
+  class Album
+    include Faceted::Presenter
+    presents :album, :find_by => :name
+    field :name
+  end
+
   describe Musician do
 
     before do
 
       @ar_musician = ::Musician.new(:id => 1, :name => 'Johnny Cash', :rating => 'Good', :alive => false)
-      ::Musician.stub(:find) { @ar_musician }
+      ::Musician.stub(:where) { @ar_musician }
 
       @ar_birthplace = ::Birthplace.new(:id => 1, :city => 'Kingsland', :state => 'Arkansas')
-      ::Birthplace.stub(:find) { @ar_birthplace }
+      ::Birthplace.stub(:where) { @ar_birthplace }
 
     end
 
@@ -110,6 +123,13 @@ class Musician
         musician.birthplace.city.should == 'Kingsland'
       end
 
+      it 'initializes the associated object finding by a specified key' do
+        @ar_album = ::Album.new(:id => 1, :name => 'Greatest Hits')
+        ::Album.stub(:where) { @ar_album }
+        album = MyApi::Album.new(:name => 'Greatest Hits')
+        album.id.should == 1
+      end
+
     end
 
   end