> About 18 months ago, I needed to get Sequel to cough up a list of foreign
> keys for a model. I did it by slapping on a PostgreSQL-specific extension:

> module Sequel
>         class Model
>                 def self.foreign_keys
>                         Hash[*DB["SELECT tc.constraint_name,
> kcu.column_name
>                                 FROM information_schema.table_constraints
> AS tc JOIN information_schema.key_column_usage AS kcu using
> (constraint_name)
>                                 WHERE constraint_type = 'FOREIGN KEY' AND
> tc.table_name='#{self.table_name}'"].collect{|row|
>                                         [row[:column_name].to_sym,
> row[:constraint_name]]
>                                 }.flatten]
>                 end
>         end
> end

> There've been a lot of newer releases since I wrote that. Is there now a
> built-in way to access foreign keys?