Renamed Deliverable.due_date to due so it doesn't conflict with issue.due_date

db/migrate/008_rename_due_date_to_due.rb

@@ -0,0 +1,25 @@
+class RenameDueDateToDue < ActiveRecord::Migration
+  def self.up
+    add_column :deliverables, :due, :date
+    
+    Deliverable.reset_column_information
+    
+    Deliverable.find(:all).each do |deliverable|
+      deliverable.update_attribute(:due, deliverable.due_date)
+    end
+    
+    remove_column :deliverables, :due_date
+  end
+  
+  def self.down
+    add_column :deliverables, :due_date, :date
+    
+    Deliverable.reset_column_information
+    
+    Deliverable.find(:all).each do |deliverable|
+      deliverable.update_attribute(:due_date, deliverable.due)
+    end
+    
+    remove_column :deliverables, :due
+  end
+end