Your logic seems rather flawed in this one. A "user" form shouldn't be
modifying book titles. It would seem rather difficult to setup as well. It
would be difficult to distinguish between the scenario where the user is
checking out another book and when you would be magically changing the title
of a book from within the user screen. I don't think this is a data mapper
issue - you should really re-examine your data flow on this one.
John
On Tue, Aug 26, 2008 at 1:59 AM, harry <[EMAIL PROTECTED]> wrote:
>
> Then I could avoid creating a custom update-function, for complex forms.
>
> 2008/8/26 Abdul-Rahman Advany <[EMAIL PROTECTED]>:
> >
> > Why not u.library.update_attributes?
> >
> > On 26 aug, 02:41, "harry jr." <[EMAIL PROTECTED]> wrote:
> >> Hello. Suppose I have this model:
> >>
> >> class User
> >> include DataMapper::Resource
> >> property :id, Integer, :serial => true
> >> property :name, String
> >>
> >> has 1, :library
> >> has n, :books
> >> end
> >>
> >> class Library
> >> include DataMapper::Resource
> >> property :id, Integer, :serial => true
> >> property :name, String
> >>
> >> belongs_to :user
> >> end
> >>
> >> class Book
> >> include DataMapper::Resource
> >> property :id, Integer, :serial => true
> >> property :title, String
> >>
> >> belongs_to :user
> >> end
> >>
> >> Then I can do this in IRB:
> >>
> >> > u = User.create(:name => "harry", :library => {:name => 'West Side'},
> :books => [{:title => "How to Win"}, {:title => "How Not to Lose"}])
> >>
> >> => #<User id=4 name="harry" password=nil>>> u.library
> >>
> >> => #<Library id=4 name="West Side" user_id=4>>> u.books
> >>
> >> => [#<Book id=4 title="How to Win" user_id=4>, #<Book id=5 title="How
> >> Not to Lose" user_id=4>]>> u.update_attributes(:library => {:name =>
> 'East Side'})
> >> => true
> >> >> u.library
> >>
> >> => #<Library id=5 name="East Side" user_id=4>
> >>
> >> But how would i do a u.update_attribtues to change the title of book
> >> with id 5 to 'My Story' ?
> > >
> >
>
>
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