From: George Moschovitis <george.moschovitis@...>
Date: 2005-10-29T02:43:23+09:00
Subject: Re: The "perfect" ORM?

> This is very different from composing a domain model, coding it up,
> then devising a mapper to persist your object graph.  As far as I
> know there are no Ruby ORM that attempt this.

Ehm, Og does that.

First you get your somain model:

class User
  attr_accessor :name
end

class Book
  attr_accessor :title
end


Then you can annotate the model as needed (even in another source file):

class User
  ann :name, :klass => String
  has_many :books
end

class Book
  belongs_to :user
end

Of course you can combine the two steps in one if you want (and typically you
want this ;-))


then you just issue:

user.save to perist yourt object
or
User.find_by_name(...)
to query etc etc...

Og even allows for inheritance and polymorphic relations. You can use
a non RDBMS store if you want, or no store at all (use it just as an
object manager). I suggest you have a look at this.


regards,
George.



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