On Jan 9, 2:54 am, Jamie Hodge <[email protected]> wrote:
> > Your approach doesn't look bad, but you could try using the
> > nested_attributes plugin.
>
> I looked at nested_attributes. I fail to see how one can add new
> many_to_many associations using the plugins. I see that there are
> _delete/_destroy keys. Where do you intend the what's new?/what's to
> discard logic to sit? I would love to see a gist of an ideal
> many_to_many nesting, or at least the important fragments.
Here's a basic self contained example:
DB.create_table(:as) do
primary_key :id
String :name
end
DB.create_table(:bs) do
primary_key :id
String :name
end
DB.create_table(:as_bs) do
foreign_key :a_id, :as
foreign_key :b_id, :bs
primary_key [:a_id, :b_id]
end
class A < Sequel::Model
plugin :nested_attributes
many_to_many :bs
nested_attributes :bs
end
class B < Sequel::Model
end
a = A.new(:name=>'A')
a.bs_attributes = [{:name=>'B'}]
a.save
Basically, if you don't provide a primary key for the nested object,
it creates a new object. If you provide a primary key, it updates the
existing value unless you provide a _delete or _remove entry, in which
case it deletes or removes it.
Looking at the plugin's documentation, I can see why you would be
confused, it doesn't do a good job of explaining the plugin's use.
I'll try to improve the plugin's documentation before the next
release.
Thanks,
Jeremy
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