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
end
class Discount < Sequel::Model
end
subscription = Subscription.create
subscription.add_discount(valid_until: Date.today + 3)
pp Hash[
DEFAULT_ACTIVE_DISCOUNT: Subscription.first.active_discount,
RESTRICTED_ACTIVE_DISCOUNT: Subscription.first.active_discount(Date.today)
]
And in case Google eats the formatting, here's a
gist: https://gist.github.com/adam12/772a7aa99a912ccf71042fd4747d4869
Any comments on the alias or the general implementation would be
appreciated.
Thanks.
Adam
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