Ali [got your mail 6 days later for some reason]
1) first remember that in Ruby "<<" is the "append" operator, eg:
p = [ 3 ]
p << 1 << 4 # => [3, 1, 4]
2) now in ActiveRecord
post1 = Post.create(..) # this must be saved in db
comment = Comment.create(..) # ,,
post1.comments << comment
This is more than adding 'comment' to the list; *it is linking back the
foreign key of comment back to post1*. So that the next time you do:
post1 = Post.find(...)
post1.comments.each { |comment| ... }
it will be able to find all the comments of post1.
Raul
On Tue, Dec 2, 2008 at 10:10 PM, alibaba82 <[EMAIL PROTECTED]> wrote:
>
> class CreateTestData < ActiveRecord::Migration
> def self.up
> down # Delete all rows from the posts and comments tables
>
> post1 = Post.create(:id => 1, :title=> "First title", :body=>
> "This is the body of the first posting")
>
> comment = Comment.create(:id => 1, :comment=>"What a boring
> posting. Can you do better next time? - Sang Shin")
> post1.comments << comment
>
>
> I dont understand the following line
> post1.comments << comment
>
> What does '<<' do
>
> Thanks
>
> Ali
>
> >
>
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