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Karthi kn

2007-Dec-28 05:05 UTC

Problem in updating the association object attributes

Hi All,

I am not able to update the association''s object attributes along with
my model object.

For example, my models are,

  class Library
    has_many :books
  end

  class Book
    belongs_to :library
  end

I am getting the attribute values for both the models from the view and
I try to update both in a single transaction. When I tried like,

  @book.attributes = params[:book]
  @book.library.attributes = params[:library]
  @book.save

It is updating the books table but not the libraries table.
But when I try the same logic for new book and new library creation, it
works fine. The problem is only when updating.

Now i have implemented as,

  @book.update_attributes(params[:book])
  @book.update_attributes(params[:library])

But I want to update both the attributes in a single statement and in a
single transaction.

Any suggestions???

Thanks in advance...
-- 
Posted via http://www.ruby-forum.com/.

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Ryan Bigg

2007-Dec-28 05:17 UTC

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Re: Problem in updating the association object attributes

afaik you can''t do anything like that.

Also it should be:

book.library.update_attributes(params[:library])

On Dec 28, 2007 3:35 PM, Karthi kn
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:
>
> Hi All,
>
> I am not able to update the association''s object attributes along
with
> my model object.
>
> For example, my models are,
>
>  class Library
>    has_many :books
>  end
>
>  class Book
>    belongs_to :library
>  end
>
> I am getting the attribute values for both the models from the view and
> I try to update both in a single transaction. When I tried like,
>
>  @book.attributes = params[:book]
>  @book.library.attributes = params[:library]
>  @book.save
>
> It is updating the books table but not the libraries table.
> But when I try the same logic for new book and new library creation, it
> works fine. The problem is only when updating.
>
> Now i have implemented as,
>
>  @book.update_attributes(params[:book])
>  @book.update_attributes(params[:library])
>
> But I want to update both the attributes in a single statement and in a
> single transaction.
>
> Any suggestions???
>
> Thanks in advance...
> --
> Posted via http://www.ruby-forum.com/.
>
> >
>

-- 
Ryan Bigg
http://www.frozenplague.net
Feel free to add me to MSN and/or GTalk as this email.

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Karthi kn

2007-Dec-28 05:20 UTC

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Re: Problem in updating the association object attributes

Ryan Bigg wrote:> afaik you can''t do anything like that.
> 
> Also it should be:
> 
> book.library.update_attributes(params[:library])
> 

Yes. Sorry. That was my typing mistake. But, is it not possible to 
update both in a single transaction?
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Ryan Bigg

2007-Dec-28 05:22 UTC

head link

Re: Problem in updating the association object attributes

Like I said, no there isn''t as far as I know.

On Dec 28, 2007 3:50 PM, Karthi kn
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:
>
> Ryan Bigg wrote:
> > afaik you can''t do anything like that.
> >
> > Also it should be:
> >
> > book.library.update_attributes(params[:library])
> >
>
>
> Yes. Sorry. That was my typing mistake. But, is it not possible to
> update both in a single transaction?
> --
> Posted via http://www.ruby-forum.com/.
>
> >
>

-- 
Ryan Bigg
http://www.frozenplague.net
Feel free to add me to MSN and/or GTalk as this email.

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Karthi kn

2007-Dec-28 05:24 UTC

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Re: Problem in updating the association object attributes

Ok. Thanks.
-- 
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Rick DeNatale

2007-Dec-28 17:03 UTC

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Re: Problem in updating the association object attributes

On Dec 28, 2007 12:20 AM, Karthi kn
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:>
> Ryan Bigg wrote:
> > afaik you can''t do anything like that.
> >
> > Also it should be:
> >
> > book.library.update_attributes(params[:library])
> >
>
>
> Yes. Sorry. That was my typing mistake. But, is it not possible to
> update both in a single transaction?
Assuming that the tables are in the same database, you can do it in a
single transaction, albeit not in a single save.

Library.transaction do
  @library.update_attributes(params[:book])
  @book.update_attributes(params[:library])
end

Whether you use Library or Book as the receiver of the transaction
method shouldn''t matter since the transaction applies to the database
connection which is shared assuming, as I said, that both tables are
in the same DB.




-- 
Rick DeNatale

My blog on Ruby
http://talklikeaduck.denhaven2.com/

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Rails - Dec 2007 - Problem in updating the association object attributes

Problem in updating the association object attributes

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