Rails - Oct 2008 - Re: Returning a record's ID before the record is made?!??

In their example,

def create
  @product = Product.new(params[:product])
  @details = Detail.new(params[:details])
  Product.transaction do
    @product.save!
    @details.product = @product
    @details.save!
    redirect_to :action => :show, :id => @product
  end
rescue ActiveRecord::RecordInvalid => e
  @details.valid? # force checking of errors even if products failed
  render :action => :new
end

they assign the product to the details, @details.product = @product. When
you do that with related ActiveRecord objects, ActiveRecord takes care of
setting the IDs for you. In this case, @details.product_id will be set to @
product.id.

Regards,
Craig

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Craig Demyanovich wrote:
> In their example,
> ... [snip]
> they assign the product to the details, @details.product = @product. 
> When
> you do that with related ActiveRecord objects, ActiveRecord takes care 
> of
> setting the IDs for you. In this case, @details.product_id will be set 
> to @
> product.id.
> 
> Regards,
> Craig
Thanks for your post Craig.  I could not wrap my head around this 
concept, partially because it was so difficult for me to implement in 
JSP that I resorted to using randomly generated UUID''s before inputing 
the record into the database.

Active Record to the rescue indeed.  Wow.  I spent about an hour playing 
with this last night and was able to magically get this to, well, just 
work in Rails.

When I wrote this post originally I hadn''t yet tried the example as I 
just couldn''t understand the code and how it worked.  I took the leap
of
faith and followed the example and Ta-da, onto more interesting 
problems.

I should also not that another user wrote me off-list and I''d like to 
thank him/her for the wonderfully helpful response.  I am not mentioning 
his/her name in the event that they wrote off list because they wanted 
to remain anonymous.  But thank you.  They suggested I read:
http://railsguides.phusion.nl/activerecord/association_basics.html
and it helped immensely.  I felt like I missed a meeting!

Ruby/Rails has been such a fun experiment thus far.  I''m really loving 
it''s elegance and simplicity.  Thanks again to all.  TTFN.
-- 
Posted via http://www.ruby-forum.com/.

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