/usr/lib/ruby/vendor_ruby/sequel/plugins/eager_each.rb is in ruby-sequel 4.1.1-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 | module Sequel
module Plugins
# The eager_each plugin makes calling each on an eager loaded dataset do eager loading.
# By default, each does not work on an eager loaded dataset, because each iterates
# over rows of the dataset as they come in, and to eagerly load you need to have all
# values up front. With the default associations code, you must call #all on an eagerly
# loaded dataset, as calling #each on an #eager dataset skips the eager loading, and calling
# #each on an #eager_graph dataset makes it yield plain hashes with columns from all
# tables, instead of yielding the instances of the main model.
#
# This plugin makes #each call #all for eagerly loaded datasets. As #all usually calls
# #each, this is a bit of issue, but this plugin resolves the issue by cloning the dataset
# and setting a new flag in the cloned dataset, so that each can check with the flag to
# determine whether it should call all.
#
# Usage:
#
# # Make all model subclass instances eagerly load for each (called before loading subclasses)
# Sequel::Model.plugin :eager_each
#
# # Make the Album class eagerly load for each
# Album.plugin :eager_each
module EagerEach
module DatasetMethods
# Call #all instead of #each if eager loading,
# uless #each is being called by #all.
def each(&block)
if use_eager_all?
all(&block)
else
super
end
end
# If eager loading, clone the dataset and set a flag to let #each know not to call #all,
# to avoid the infinite loop.
def all(&block)
if use_eager_all?
clone(:all_called=>true).all(&block)
else
super
end
end
private
# Wether to use all when each is called, true when eager loading
# unless the flag has already been set.
def use_eager_all?
(opts[:eager] || opts[:eager_graph]) && !opts[:all_called]
end
end
end
end
end
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