Module: Polymorpheus::Interface::ClassMethods

Defined in:
lib/polymorpheus/interface.rb

Instance Method Summary collapse

Instance Method Details

#belongs_to_polymorphic(*association_names, options) ⇒ Object 



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# File 'lib/polymorpheus/interface.rb', line 25

def belongs_to_polymorphic(*association_names, options)
  polymorphic_api = options[:as]
  builder = Polymorpheus::InterfaceBuilder.new(polymorphic_api,
                                               association_names)

  # The POLYMORPHEUS_ASSOCIATIONS constant is useful for two reasons:
  #
  # 1. It is useful for other classes to be able to ask this class
  #    about its polymorphic relationship.
  #
  # 2. It prevents a class from defining multiple polymorphic
  #    relationships. Doing so would be a bad idea from a design
  #    standpoint, and we don't want to allow for (and support)
  #    that added complexity.
  #
  const_set('POLYMORPHEUS_ASSOCIATIONS', builder.association_names)

  # Set belongs_to associations
  builder.associations.each do |association|
    belongs_to association.name.to_sym
  end

  # Exposed interface for introspection
  define_method 'polymorpheus' do
    builder.exposed_interface(self)
  end

  # Getter method
  define_method polymorphic_api do
    builder.get_associated_object(self)
  end

  # Setter method
  define_method "#{polymorphic_api}=" do |object_to_associate|
    builder.set_associated_object(self, object_to_associate)
  end
end

#has_many_as_polymorph(association, options = {}) ⇒ Object 



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# File 'lib/polymorpheus/interface.rb', line 63

def has_many_as_polymorph(association, options = {})
  options.symbolize_keys!
  conditions = options.fetch(:conditions, {})
  fkey = name.foreign_key

  class_name = options[:class_name] || association.to_s.classify

  options[:conditions] = proc {
    keys = class_name.constantize
            .const_get('POLYMORPHEUS_ASSOCIATIONS')
            .map(&:foreign_key)
    keys.delete(fkey)

    keys.reduce({}) { |hash, key| hash.merge!(key => nil) }
  }

  has_many association, options
end

#validates_polymorph(polymorphic_api) ⇒ Object 



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# File 'lib/polymorpheus/interface.rb', line 82

def validates_polymorph(polymorphic_api)
  validate Proc.new {
    unless polymorpheus.active_association
      association_names = polymorpheus.associations.map(&:name)
      errors.add(:base, "You must specify exactly one of the following: "\
                        "{#{association_names.join(', ')}}")
    end
  }
end