Rails - Jun 2009 - has_many through , or habtm , using form

i think there ara two ways of relate products and categories ,
basically i want to fix one product(e.g hp dv7....)  to some categories
(notebook,17"notebooks...)
i made a table named categorization(incuding category_id,product_id
fields) then in models i write these codes below

class Product < ActiveRecord::Base
        has_many :categories, :through => :categorizations
        has_many :categorizations
end

class Categorization < ActiveRecord::Base
	belongs_to :product
	belongs_to :kategori
end

class Category < ActiveRecord::Base
	has_many :products, :through =>:categorizations
	has_many :categorizations
end

i''m not sure how rails complain which field will be use for relation
products and categories in categorization table(this is missing chain
i think)...anyway if we continue :) , i have to make form (creating
new product and add a new row in categorization table for identify
categories of product we want to add at the same time )

which method should i use for add new product and its categories at
the same time?

lecielbleu wrote:
> i think there ara two ways of relate products and categories ,
> basically i want to fix one product(e.g hp dv7....)  to some categories
> (notebook,17"notebooks...)
> i made a table named categorization(incuding category_id,product_id
> fields) then in models i write these codes below
> 
> class Product < ActiveRecord::Base
>         has_many :categories, :through => :categorizations
>         has_many :categorizations
> end
> 
> class Categorization < ActiveRecord::Base
>   belongs_to :product
>   belongs_to :kategori
I think you meant :category.
> end
> 
> class Category < ActiveRecord::Base
>   has_many :products, :through =>:categorizations
>   has_many :categorizations
> end
This all looks fine, but unless you''re planning to put additional data 
in the categorizations table, you might as well use habtm and write less 
code.
> 
> i''m not sure how rails complain which field will be use for
relation
> products and categories in categorization table
It will expect product_id and category_id fields, just as with any other 
association.
> (this is missing chain
> i think)...anyway if we continue :) , i have to make form (creating
> new product and add a new row in categorization table for identify
> categories of product we want to add at the same time )
> 
> which method should i use for add new product and its categories at
> the same time?
You''ll need to create the product and/or categories if they
don''t
already exist, then create a categorization to bind them together. 
Something like this:

product = Product.new(params[:product])
category = Category.find(params[:category_id])
Categorization.create!(:product => product, :category => category)

I hope that answers your question!


Best,
--
Marnen Laibow-Koser
http://www.marnen.org
marnen-sbuyVjPbboAdnm+yROfE0A@public.gmane.org
-- 
Posted via http://www.ruby-forum.com/.

Marnen Laibow-Koser wrote:
[...]
> Something like this:
> 
> product = Product.new(params[:product])
> category = Category.find(params[:category_id])
> Categorization.create!(:product => product, :category => category)
Silly me!  Instead of that last line, you could do product.category_ids 
<< category.id .


Best,
--
Marnen Laibow-Koser
http://www.marnen.org
marnen-sbuyVjPbboAdnm+yROfE0A@public.gmane.org
> 
> I hope that answers your question!
> 
> 
> Best,
> --
> Marnen Laibow-Koser
> http://www.marnen.org
> marnen-sbuyVjPbboAdnm+yROfE0A@public.gmane.org
-- 
Posted via http://www.ruby-forum.com/.

Many thanks , whats your suggestion about making a form using these
codes?

On Jun 22, 6:57 pm, Marnen Laibow-Koser <rails-mailing-l...@andreas-
s.net> wrote:
> Marnen Laibow-Koser wrote:
>
> [...]
>
> > Something like this:
>
> > product = Product.new(params[:product])
> > category = Category.find(params[:category_id])
> > Categorization.create!(:product => product, :category =>
category)
>
> Silly me!  Instead of that last line, you could do product.category_ids
> << category.id .
>
> Best,
> --
> Marnen Laibow-Koserhttp://www.marnen.org
> mar...-sbuyVjPbboAdnm+yROfE0A@public.gmane.org
>
>
>
> > I hope that answers your question!
>
> > Best,
> > --
> > Marnen Laibow-Koser
> >http://www.marnen.org
> > mar...-sbuyVjPbboAdnm+yROfE0A@public.gmane.org
>
> --
> Posted viahttp://www.ruby-forum.com/.

lecielbleu wrote:
> Many thanks , whats your suggestion about making a form using these
> codes?
You can certainly do that.  Check out Stephen Chu''s params[:fu] series 
of blog posts, as well as the Railscasts on complex forms and the 
documentation regarding nested resources in Rails 2.3.2.

Best,
--
Marnen Laibow-Koser
http://www.marnen.org
marnen-sbuyVjPbboAdnm+yROfE0A@public.gmane.org
-- 
Posted via http://www.ruby-forum.com/.

Thanks Marnen i solved using Stephen Chu''s params[:fu] fantastic
series :)

On Jun 23, 1:45 am, Marnen Laibow-Koser <rails-mailing-l...@andreas-
s.net> wrote:
> lecielbleu wrote:
> > Many thanks , whats your suggestion about making a form using these
> > codes?
>
> You can certainly do that.  Check out Stephen Chu''s params[:fu]
series
> of blog posts, as well as the Railscasts on complex forms and the
> documentation regarding nested resources in Rails 2.3.2.
>
> Best,
> --
> Marnen Laibow-Koserhttp://www.marnen.org
> mar...-sbuyVjPbboAdnm+yROfE0A@public.gmane.org
> --
> Posted viahttp://www.ruby-forum.com/.