Rails - Dec 2006 - has_many :through does it support collection_singular_ids ?

Good evening list members,

I have the following model:

  class Author < ActiveRecord::Base
    has_many :authorships
    has_many :books, :through => : authorships
  end

Should I be able to do the following?

  Author.find(:first).book_ids = [1,2,3]

I ask, because it doesn''t. The docs state that it should, but it  
doesn''t specialise in the case of a :through

This works fine BTW:

  Author.find(:first).authorship_ids = [12,13]

Do I really need to find and add (<<) my associated join models for  
books one by one?

-christos

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Good evening list members,

I have the following model:

  class Author < ActiveRecord::Base
    has_many :authorships
    has_many :books, :through => : authorships
  end

Should I be able to do the following?

  Author.find(:first).book_ids = [1,2,3]

I ask, because it doesn''t. The docs state that it should, but it  
doesn''t specialise in the case of a :through

This works fine BTW:

  Author.find(:first).authorship_ids = [12,13]

Do I really need to find and add (<<) my associated join models for  
books one by one?

-christos

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Good evening list members,

I have the following model:

  class Author < ActiveRecord::Base
    has_many :authorships
    has_many :books, :through => : authorships
  end

Should I be able to do the following?

  Author.find(:first).book_ids = [1,2,3]

I ask, because it doesn''t. The docs state that it should, but it  
doesn''t specialise in the case of a :through

This works fine BTW:

  Author.find(:first).authorship_ids = [12,13]

Do I really need to find and add (<<) my associated join models for  
books one by one?

-christos

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Good evening list members,

I have the following model:

  class Author < ActiveRecord::Base
    has_many :authorships
    has_many :books, :through => : authorships
  end

Should I be able to do the following?

  Author.find(:first).book_ids = [1,2,3]

I ask, because it doesn''t. The docs state that it should, but it  
doesn''t specialise in the case of a :through

This works fine BTW:

  Author.find(:first).authorship_ids = [12,13]

Do I really need to find and add (<<) my associated join models for  
books one by one?

-christos

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Good evening list members,

I have the following model:

 class Author < ActiveRecord::Base
   has_many :authorships
   has_many :books, :through => : authorships
 end

Should I be able to do the following?

 Author.find(:first).book_ids = [1,2,3]

I ask, because it doesn''t. The docs state that it should, but it
doesn''t specialise in the case of a :through

This works fine BTW:

 Author.find(:first).authorship_ids = [12,13]

Do I really need to find and add (<<) my associated join models for
books one by one?

-christos

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On Dec 20, 9:59 am, "Christos Zisopoulos"
<chris...-zTsVz9fE6/I55T7KX7PIFA@public.gmane.org>
wrote:
> Good evening list members,
>
> I have the following model:
>
>  class Author < ActiveRecord::Base
>    has_many :authorships
>    has_many :books, :through => : authorships
>  end
>
> Should I be able to do the following?
>
>  Author.find(:first).book_ids = [1,2,3]
Hi Christos,

What are you trying to do here?  It looks to me as if you are trying to
add some books to an author... if so, how about:

a = Author.find(:first)
Book.find(1,2,3).each { |b| Authorship.create(:author=>a, :book=>b) }

or, in Rails 1.2

a = Author.find(:first)
Book.find(1,2,3).each { |b| a.books << b }
>
> I ask, because it doesn''t. The docs state that it should, but it
> doesn''t specialise in the case of a :through
>
> This works fine BTW:
>
>  Author.find(:first).authorship_ids = [12,13]
>
> Do I really need to find and add (<<) my associated join models for
> books one by one?
>
> -christos
Also, I would almost never expect to directly use foreign keys in
rails, so you should begin to wonder if you find yourself doing so...

(If I''ve totally missed the point here, let me know and I''ll
try again
:)

Best,

-r

--
Ryan Raaum
http://raaum.org
http://rails.raaum.org -- Rails docs
http://locomotive.raaum.org -- Self contained Rails for Mac OS X


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As I understand it handing in an array of ids to book_ids only works for a
has_many relationship.  Even though it''s declared as a has_many
relationship, has_many :through is technically a has_and_belongs_to_many
relationship. I have not tested this thoroughly, it''s just how I
believe it
works.

On 12/20/06, ryan.raaum-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
<ryan.raaum-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
>
>
>
> On Dec 20, 9:59 am, "Christos Zisopoulos" <
chris...-zTsVz9fE6/I55T7KX7PIFA@public.gmane.org>
> wrote:
> > Good evening list members,
> >
> > I have the following model:
> >
> >  class Author < ActiveRecord::Base
> >    has_many :authorships
> >    has_many :books, :through => : authorships
> >  end
> >
> > Should I be able to do the following?
> >
> >  Author.find(:first).book_ids = [1,2,3]
>
> Hi Christos,
>
> What are you trying to do here?  It looks to me as if you are trying to
> add some books to an author... if so, how about:
>
> a = Author.find(:first)
> Book.find(1,2,3).each { |b| Authorship.create(:author=>a, :book=>b) }
>
> or, in Rails 1.2
>
> a = Author.find(:first)
> Book.find(1,2,3).each { |b| a.books << b }
>
> >
> > I ask, because it doesn''t. The docs state that it should, but
it
> > doesn''t specialise in the case of a :through
> >
> > This works fine BTW:
> >
> >  Author.find(:first).authorship_ids = [12,13]
> >
> > Do I really need to find and add (<<) my associated join models
for
> > books one by one?
> >
> > -christos
>
> Also, I would almost never expect to directly use foreign keys in
> rails, so you should begin to wonder if you find yourself doing so...
>
> (If I''ve totally missed the point here, let me know and
I''ll try again
> :)
>
> Best,
>
> -r
>
> --
> Ryan Raaum
> http://raaum.org
> http://rails.raaum.org -- Rails docs
> http://locomotive.raaum.org -- Self contained Rails for Mac OS X
>
>
> >
>

-- 
Mike Weber
Web Developer
UW-Eau Claire

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On 20 Dec 2006, at 16:37, ryan.raaum-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
wrote:
> On Dec 20, 9:59 am, "Christos Zisopoulos"
<chris...-zTsVz9fE6/I55T7KX7PIFA@public.gmane.org>
> wrote:
>> Good evening list members,
>>
>> I have the following model:
>>
>>  class Author < ActiveRecord::Base
>>    has_many :authorships
>>    has_many :books, :through => : authorships
>>  end
>>
>> Should I be able to do the following?
>>
>>  Author.find(:first).book_ids = [1,2,3]
>
> Hi Christos,
>
> What are you trying to do here?  It looks to me as if you are  
> trying to
> add some books to an author... if so, how about:
[snip]
> Also, I would almost never expect to directly use foreign keys in
> rails, so you should begin to wonder if you find yourself doing so...
I am trying to assign a bunch of books returned from something like  
this in my view:

  <% Book.find(:all).each do |team| %>
   <%= check_box_tag "book_ids[]", book.id %> <%= book.title
%><br />
  <% end %>

(I could have used a collection_select, but the above is an example  
only)
> a = Author.find(:first)
> Book.find(1,2,3).each { |b| a.books << b }
This is what I ended up doing...
> (If I''ve totally missed the point here, let me know and
I''ll try again
> :)
I think Mike Weber in his reply to my post confirms my suspicion; It  
doesn''t work :through.

Cheers!
-christos




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