Hi Jeremy, thanks for the reply. That's what I want to do though... I want
to create/update my associations whenever I do something to Book or
Author... I need to update the author_book table. So if I add an Author
with associated Books, insert these associations into the author_book
table. I don't actually want to modify a particular Book or Author's pk in
its table--I just want to make sure my join table reflects which authors
are associated to which books, and vice versa.
On Friday, May 2, 2014 8:53:00 AM UTC-6, Jeremy Evans wrote:
>
> 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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