Fixed: not null constraints not removed with Postgresql.

git-svn-id: http://redmine.rubyforge.org/svn/trunk@1140 e93f8b46-1217-0410-a6f0-8f06a7374b81

db/migrate/048_allow_null_version_effective_date.rb

@@ -1,6 +1,6 @@
 class AllowNullVersionEffectiveDate < ActiveRecord::Migration
   def self.up
-    change_column :versions, :effective_date, :date, :default => nil
+    change_column :versions, :effective_date, :date, :default => nil, :null => true
   end
 
   def self.down

db/migrate/076_allow_null_position.rb

@@ -1,11 +1,11 @@
 class AllowNullPosition < ActiveRecord::Migration
   def self.up
     # removes the 'not null' constraint on position fields
-    change_column :issue_statuses, :position, :integer, :default => 1
-    change_column :roles, :position, :integer, :default => 1
-    change_column :trackers, :position, :integer, :default => 1
-    change_column :boards, :position, :integer, :default => 1
-    change_column :enumerations, :position, :integer, :default => 1
+    change_column :issue_statuses, :position, :integer, :default => 1, :null => true
+    change_column :roles, :position, :integer, :default => 1, :null => true
+    change_column :trackers, :position, :integer, :default => 1, :null => true
+    change_column :boards, :position, :integer, :default => 1, :null => true
+    change_column :enumerations, :position, :integer, :default => 1, :null => true
   end
 
   def self.down

db/migrate/087_change_projects_description_to_text.rb

@@ -1,6 +1,6 @@
 class ChangeProjectsDescriptionToText < ActiveRecord::Migration
   def self.up
-    change_column :projects, :description, :text
+    change_column :projects, :description, :text, :null => true
   end
 
   def self.down