[#4177] Added Contract associations.

app/models/contract.rb

@@ -1,3 +1,8 @@
 class Contract < ActiveRecord::Base
   unloadable
+
+  # Associations
+  belongs_to :project
+  belongs_to :account_executive, :class_name => 'User', :foreign_key => 'account_executive_id'
+  
 end