Module: AdvancedAR::CustomPreloaders

Defined in:
lib/advanced_ar/custom_preloaders.rb

Overview

Example Usage (Preloading items with reference to the same Polymorphic Object):

has_many :related_objects, -> (self) { where(poly_type: self.poly_type, poly_id: self.poly_id) }, preloader: ‘RelatedObjectPreloader’

class RelatedObjectPreloader < ActiveRecord::Associations::Preloader::Association

def run(preloader)
  @preloaded_records = []
  owners.group_by(&:poly_type).each do |type, owner_group|
    ids = owner_group.map(&:poly_id)

    ids_to_priors = {}
    scope = Poly.scope_for_association.where(poly_type: self.poly_type, poly_id: self.poly_id)
    scope.find_each do |pa|
      ids_to_priors[pa.poly_id] ||= []
      ids_to_priors[pa.poly_id] << pa
      @preloaded_records << pa
    end

    owner_group.each do |owner|
      priors = ids_to_priors[owner.poly_id] || []

      association = owner.association(reflection.name)
      association.loaded!
      association.target = priors

      # association.set_inverse_instance(record)
    end
  end
end

end

Defined Under Namespace

Modules: AssociationBuilderExtension, PreloaderExtension

Class Method Summary collapse

Class Method Details

.install ⇒ Object 



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# File 'lib/advanced_ar/custom_preloaders.rb', line 53

def self.install
  ActiveRecord::Associations::Builder::Association.extensions << AssociationBuilderExtension
  ActiveRecord::Associations::Preloader.prepend(CustomPreloaders::PreloaderExtension)
end