creating facebook url

app/models/enterprise_group.rb

@@ -41,4 +41,20 @@ class EnterpriseGroup < ActiveRecord::Base
     address.firstname = address.lastname = 'unused' if address.present?
   end
 
+  def facebook_url
+    if (facebook.blank?) then
+      return nil
+    end
+    if is_url? facebook then
+      facebook
+    else
+      'https://www.facebook.com/' + facebook
+    end
+  end
+
+  private
+
+  def is_url?(s)
+    s.andand.include? '://'
+  end
 end

spec/models/enterprise_group_spec.rb

@@ -52,4 +52,15 @@ describe EnterpriseGroup do
       EnterpriseGroup.on_front_page.should == [eg1]
     end
   end
+
+  describe "urls" do
+    it 'provides a Facebook URL' do
+      g = create(:enterprise_group)
+      g.facebook_url.should be_nil
+      g.facebook = 'test'
+      g.facebook_url.should == 'https://www.facebook.com/test'
+      g.facebook = 'http://fb.com/test'
+      g.facebook_url.should == g.facebook
+    end
+  end
 end