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Contents
# frozen_string_literal: true
module N1Loader
# Preloader that lazily preloads data to every element.
#
# It supports multiple keys.
#
# It supports elements that have different loaders under the same key.
# It will properly preload data to each of the element of the similar group.
class Preloader
attr_reader :elements
def initialize(elements)
@elements = elements
end
def preload(*keys)
keys.flatten(1).flat_map do |key|
elements
.group_by { |element| loader_class(element, key) }
.map do |loader_class, grouped_elements|
next unless loader_class
loader_collection = N1Loader::LoaderCollection.new(loader_class, grouped_elements)
grouped_elements.each { |grouped_element| grouped_element.n1_loader_set(key, loader_collection) }
loader_collection
end.compact
end
end
private
def loader_class(element, key)
element.class.respond_to?(:n1_loader_defined?) &&
element.class.n1_loader_defined?(key) &&
element.class.n1_loader(key)
end
end
end
Version data entries
15 entries across 15 versions & 1 rubygems