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# frozen_string_literal: true
require "ar_lazy_preload/context"
module ArLazyPreload
# ActiveRecord::Relation patch with lazy preloading support
module Relation
# Enhanced #load method will check if association has not been loaded yet and add a context
# for lazy preloading to loaded each record
def load
need_context = !loaded?
result = super
if need_context
Context.register(
records: ar_lazy_preload_records,
association_tree: lazy_preload_values
)
end
result
end
# Specify relationships to be loaded lazily when association is loaded for the first time. For
# example:
#
# users = User.lazy_preload(:posts)
# users.each do |user|
# user.first_name
# end
#
# will cause only one SQL request to load users, while
#
# users = User.lazy_preload(:posts)
# users.each do |user|
# user.posts.map(&:id)
# end
#
# will make an additional query.
def lazy_preload(*args)
check_if_method_has_arguments!(:lazy_preload, args)
spawn.lazy_preload!(*args)
end
def lazy_preload!(*args)
args.flatten!
self.lazy_preload_values += args
self
end
def lazy_preload_values
@lazy_preload_values ||= []
end
private
def ar_lazy_preload_records
@records
end
attr_writer :lazy_preload_values
end
end
Version data entries
9 entries across 9 versions & 1 rubygems