DataMapper - migration from 0.9.x to 0.10.x

Finally got some time to put here some notes for migrating DM from 0.9 to 0.10.

1. Errors. (That means you must fix)
  1.1 options[:default] must not be nil
property :customer_address_id, Integer #, :default => nil
  1.2 options :nullabe are unknown
property :deleted, Boolean, :field => 'deleteflag', :default => false #, :nullable => false
  1.3 +options[:order]+ entry "po.closed_date.desc" does not map to a property in PurchaseOrderLineItem
order_by = [DataMapper::Query::Direction.new(PurchaseOrder.properties[:closed_date], :desc)]
result = PurchaseOrderLineItem.first(:deleted => false, :cb3_id => cb3_id, 'po.deleted.eql' => false, 'po.completed.eql' => 'yes', :order => order_by)
  1.4 For composite keys
(e.g. when you do a migrate!)
property :user_id, Integer, :key => true, :nullable => false
property :role_id, Integer, :key => true, :nullable => false

2. Deprecated:
  2.1 Integer with explicit :serial option is deprecated, use Serial instead
property :id, Integer, :key => true, :serial => true, :field => 'unitsindex'
property :id, Serial
  2.2 +options[:class_name]+ is deprecated, use :model instead
belongs_to :customer_address, :class_name => "CustomerAddress", :child_key => [:customer_address_id, Integer]
  2.3 explicit use of 'in' operator is deprecated
belongs_to :order, :model => 'Order', :child_key => [:order_id, Integer], :order_type.in => ['O', 's', 'w'], you can use
:order_type => ['O', 'S'] instead.

3. Others
  model.new_record? now model.new?
  model.update_attributes now model.update