Added migration to fix incorrectly hidden todos

Signed-off-by: Reinier Balt <lrbalt@gmail.com>

db/migrate/046_fix_incorrectly_hidden_todos.rb

@@ -0,0 +1,18 @@
+class FixIncorrectlyHiddenTodos < ActiveRecord::Migration
+  def self.up
+    hidden_todos_without_project =
+      Todo.find(:all, :conditions => "state='project_hidden' AND project_id IS NULL")
+    
+    active_projects = Project.find(:all, :conditions => "state='active'")
+    hidden_todos_in_active_projects =
+      Todo.find(:all, :conditions => ["state='project_hidden' AND project_id IN (?)", active_projects])
+    
+    todos_to_fix = hidden_todos_without_project + hidden_todos_in_active_projects
+    todos_to_fix.each do |todo|
+      todo.update_attribute :state, 'active'
+    end
+  end
+
+  def self.down
+  end
+end