On Tuesday, August 26, 2014 2:59:16 PM UTC-7, DaVinci wrote:
>
> Hi again (so many Sequel experiments in my mind now ;)
>
> I have been testing these two plugins:
>
> * nested_attributes
> * class_table_inheritance
>
> in my Model. My hope was that nested_attributes managed CTI transparently,
> but
> it seems not the case. Let's see what I have:
>
> --------------------------------------
> class Container < Sequel::Model
> one_to_many :contents
> end
>
> class Content < Sequel::Model
> plugin :class_table_inheritance
> end
>
> class CubicalContent < Content
> end
>
> class ConicalContent < Content
> end
>
> class SphericalContent < Content
> end
> -------------------------------------
>
> With this model if I use nested attributes for creating with:
>
> {contents_attributes:
> [
> {kind: 'CubicalContent', cubical_data: 'bla'},
> {kind: 'ConicalContent', conical_data: 'ble'},
> {kind: 'SphericalContent', spherical_data: 'bli'}
> ]
> }
>
> I get no specific class objects, but a collection of bare Content
> instances.
> I know that this is a good deal of magic, but CTI is a great plugin for
> quality modeling. If only we could use nested attributes for
> creating/updating
> transparently without annoying corner cases, that would be great :)
>
I don't think you'll be able to get that to work. With CTI,
Superclass.new(:kind=>'Subclass') gives you an instance of Superclass, not
Subclass. However, if you reload the contents from the database, Subclass
instances should be returned.
Personally, I think CTI is a bad pattern for modeling. Favor
composition/associations over inheritance. Attempting to emulate
inheritance in the database using multiple tables is a bad idea, IMO. I
wrote the CTI plugin to show that Sequel can handle it, not because it is a
good pattern to use.
Thanks,
Jeremy
--
You received this message because you are subscribed to the Google Groups
"sequel-talk" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/sequel-talk.
For more options, visit https://groups.google.com/d/optout.
