On Friday, May 2, 2014 7:42:35 AM UTC-7, Jef Harkay wrote:
>
> I don't think I'm understanding the NestedAttributes plugin fully. What
> I'm trying to do is this... I have three tables:
>
> - author
> - book
> - author_book (join table that maps authors to books, and vice
> versa... many to many)
>
> My Author model looks like this:
>
> class Author < Sequel::Model(:author)
> many_to_many :book, left_key: :author_id, right_key: :book_id, :join_table
> => :author_book
> nested_attributes :bookend
>
> Now, I can create an Author just fine, but the problem then comes with
> creating an Author with associated Books. I'm trying to do something like
> this:
>
> author = Author.new(:name => "blah", :book_attributes => [{:id => 1}, {:id =>
> 2}])
> author.save
>
> Unfortunately, this does not work, as I get the error
> *nested_attributes_setter':
> no matching associated object with given primary key (association: book,
> pk: ["1"])*. I'm assuming this is because this Author has not been
> created yet, and so it doesn't have a primary key to insert into the join
> table? However, I can do something like this without error, but I'd rather
> not...
>
> author = Author.new(:name => "blah")
> author.save
> author.add_book(Book[1])
> author.add_book(Book[2])
>
>
> So what am I not understanding here? Can I accomplish what I'm wanting to
> do or not?
>
If you just want to change which objects are associated, you probably want
the association_pks plugin. The nested_attributes plugin is for
creating/updating associated objects at the same time as the current
object, not for associating already existing objects to the current object.
Thanks,
Jeremy
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