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Contents
# frozen_string_literal: true
require 'active_support/concern'
module ActiveRecordCustomPreloader
module RelationPatch
extend ActiveSupport::Concern
included do
private
def build_preloader
ActiveRecordCustomPreloader::AssociationsPreloader.new
end
end
# custom preload with optional args
# usage:
#
# class IncomingStatisticPreloader < ActiveRecordCustomPreloader::Preloader
# def preload(records)
# StatsApi.fetch(:incoming, group_by: args.fetch(:group_by))
# end
# end
#
# class OutgoingStatisticPreloader < ActiveRecordCustomPreloader::Preloader
# def preload(records)
# ids = records.map(&:id)
# api_result = StatsApi.fetch(:incoming, person_ids: ids, group: args.fetch(:group))
# values = api_result.group_by(&:person_id)
# records.each do |record|
# value = values[record.id] || []
# record._set_custom_preloaded_value(name, value)
# end
# end
# end
#
# class Person < ActiveRecord::Base
# add_loader :_incoming_stats, class_name: 'IncomingStatisticPreloader'
# add_loader :_outgoing_stats, class_name: 'OutgoingStatisticPreloader'
# end
#
# Person.limit(10).custom_preload(:_incoming_stats, :_outgoing_stats, group: 'hour')
# # is syntax sugar for
# Person.limit(10).preload(
# ActiveRecordCustomPreloader::PreloadWithOptions.new(:_incoming_stats, group: 'hour'),
# ActiveRecordCustomPreloader::PreloadWithOptions.new(:_outgoing_stats, group: 'hour')
# )
#
def custom_preload(*names)
args = names.extract_options!
preloads = names.map { |name| PreloadWithOptions.new(name, args) }
preload(*preloads)
end
end
end
Version data entries
7 entries across 7 versions & 1 rubygems