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module JitPreloader
class Preloader < ActiveRecord::Associations::Preloader
attr_accessor :records
def self.attach(records)
new.tap do |loader|
loader.records = records.dup
records.each do |record|
record.jit_preloader = loader
end
end
end
def jit_preload(association)
# It is possible that the records array has multiple different classes (think single table inheritance).
# Thus, it is possible that some of the records don't have an association.
records_with_association = records.reject{|r| r.class.reflect_on_association(association).nil? }
preload records_with_association, association
end
# We do not want the jit_preloader to be dumpable
# If you dump a ActiveRecord::Base object that has a jit_preloader instance variable
# you will also end up dumping all of the records the preloader has reference to.
# Imagine getting N objects from a query and dumping each one of those into a cache
# each object would dump N+1 objects which means you'll end up storing O(N^2) memory. Thats no good.
# So instead, we will just nullify the jit_preloader on load
def _dump(level)
""
end
def self._load(args)
nil
end
end
end
Version data entries
15 entries across 15 versions & 1 rubygems