Following the "chicken and egg problem with Models", I was wondering
if there was a way to create associated models easily without having
to use temporaries class.
Lets say a simple thing as blog post and comments.
class Post < Sequel::Model
many_to_one :author
one_to_many :comments
end
class Author < Sequel::Model
one_to_many :posts
end
class Comment < Sequel::Model
many_to_one :post
end
Considering authors does not need to be created, I want to create a
post, with a few prefilled comments.
I'm wondering if there are ways to code this as to construct the post
and the comments, and depending on user choice, commit it, or just
throw everything. Something like :
post = Post.new(:title => "foo", :author => Author.first(:name => "whatever")
post.add_comment(:text => "...")
ask_user_if_ok do |response|
if reponse == 'ok' then
post.create
else
post.destroy
end
end
I think transaction can solve this problem, but I'm not sure how I
would call it from sequel without the block syntax.
Moreover, while this seems here very straightforward, the post might
be created (not in the database) well ahead of the comments. The
comments are attached through gui callbacks. And the user response is
from either a cancel or save button.
regards
Simon
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