New to Datamapper

Few things to keep in mind when starting with Datamapper.

1. new records cannot be user in hashes

  h = { Record.new => 1, Record.new => 2}
  h.values # [2]


2. dm has associations

 Don't try to rewrite their getters or setters.
 No, attributes_set does not help.


3. want a Hash as a property?

 Just forget about it.


4. dm doesn't save your record?

 Method record.save returns true/false, exceptions? You wish!
 Associations have default validations, add :required => false to them


Those took me plenty hours to find out about, I hope you don't have to share my experience.