On Fri, Nov 19, 2021 at 2:00 PM adam.me...@gmail.com <
adam.mediadr...@gmail.com> wrote:
> Hi Jeremy,
>
> I'm working on something that has me a bit puzzled. I'd like to introduce
> an association that depends on a provided value, or fall back to a default.
>
> My plan is to overwrite the getter to accept an optional argument, and
> then to pass it along. But using `super` won't work. I have a method that
> does, but it's the first time I've had to alias a method inside a Sequel
> model and I wonder if there's a better way.
>
> Here's the code and annotated spot.
>
> DB.create_table(:subscriptions) do
> primary_key :id
> end
>
> DB.create_table(:discounts) do
> primary_key :id
> column :valid_until, Date
> foreign_key :subscription_id, :subscriptions
> end
>
> class Subscription < Sequel::Model
> one_to_many :discounts
>
> one_to_one :active_discount, class: :Discount do |ds|
> ds.where { valid_until >= Sequel.delay { |ds| ds.opts[:invoice_date] ||
> Sequel::CURRENT_TIMESTAMP }}
> end
>
> # Is there a better way than using an alias here? super won't work inside
> the method
> alias_method :original_active_discount, :active_discount
>
> def active_discount(invoice_date = nil)
> if invoice_date
> original_active_discount { |ds| ds.clone(invoice_date: invoice_date) }
> else
> original_active_discount
> end
> end
>
You can use the alias approach, but you don't need to, because association
methods are added to a module included in the class, not in the class
itself. You can use super, but you need the right syntax:
def active_discount(invoice_date = nil)
if invoice_date
super() { |ds| ds.clone(invoice_date: invoice_date) }
else
super()
end
end
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 sequel-talk+unsubscr...@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/sequel-talk/CADGZSSesL-echA_i7VAk6JAJWhwa%2B5AED%3D44c0VpD7yPXKOrVA%40mail.gmail.com.
