Tag Archives: plpgsql

Exclusive favorite association for ActiveRecord has_many

It’s not uncommon in my application to maintain an exclusively preferred selection out of a collection on an object. For example: class Person < ActiveRecord::Base has_many :employers, :class_name => ‘Employee’ end   class Company < ActiveRecord::Base has_many :employees end   class Employee < ActiveRecord::Base belongs_to :person belongs_to :company   named_scope :favorite, {:conditions => {:favorite => [...]