On Wednesday, May 30, 2012 10:20:38 AM UTC-7, Michael Granger wrote:
>
> > On Saturday, May 26, 2012 7:01:48 PM UTC-7, Jeremy Evans wrote:
> > > On Friday, May 25, 2012 1:28:43 PM UTC-7, Michael Granger wrote:
> > > Even though it's an unsupported use, subclassing Sequel::Model works
> quite well if you're careful. I do it in several projects in which I want
> to use Sequel::Model, but I can't know where the database is until runtime
> (e.g., connect info is in a config file, etc.).
> >
> > This is probably different from what the original poster is asking. In
> your case, your model has a backing table, it just isn't known until
> runtime. He appears to be requesting a way to use a model without a
> backing table at all.
>
> Looking back at what I wrote, I didn't explain myself well, but my
> case is the same as his *in addition* to runtime loading: both of the
> above cases subclass Sequel::Model, but don't have a backing table,
> and then all other model classes inherit from it instead of
> Sequel::Model directly. Mongrel2::Config is the abstract class in the
> first case, and WordNet::Model in the second. So instead of:
>
> ModelClass < (anonymous model class) < Sequel::Model
>
> the inheritance ends up being:
>
> ConcreteModelClass < (anonymous model class) < AbstractModelClass <
> Sequel::Model
>
Ah. Apparently I misinterpreted the original post. Having an abstract
model class without a backing table is completely supported, as long as you
only instantiate subclasses that have a backing table. The recommended way
to do this in Sequel is to use Class.new:
AbstractModelClass = Class.new(Sequel::Model)
class AbstractModelClass
# ...
end
The problem with the regular form:
class AbstractModelClass < Sequel::Model
end
Is that it is going to assume that AbstractModelClass has a dataset
associated with it, when it should not.
Sorry for the misunderstanding.
Thanks,
Jeremy
--
You received this message because you are subscribed to the Google Groups
"sequel-talk" group.
To view this discussion on the web visit
https://groups.google.com/d/msg/sequel-talk/-/p1iqO57cwqwJ.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/sequel-talk?hl=en.
