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Adding documentation regarding lazy_load_hooks

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Neeraj Singh 2010-07-29 13:05:54 -04:00
parent a506d5a524
commit 3c3ff1377d
1 changed files with 20 additions and 1 deletions
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19
activesupport/lib/active_support/lazy_load_hooks.rb
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@ -1,3 +1,22 @@
# lazy_load_hooks allows rails to lazily load a lot of components and thus making the app boot faster. Because of
# this feature now there is no need to require <tt>ActiveRecord::Base</tt> at boot time purely to apply configuration. Instead
# a hook is registered that applies configuration once <tt>ActiveRecord::Base</tt> is loaded. Here <tt>ActiveRecord::Base</tt> is used
# as example but this feature can be applied elsewhere too.
#
# Here is an example where +on_load+ method is called to register a hook.
#
# initializer "active_record.initialize_timezone" do
# ActiveSupport.on_load(:active_record) do
# self.time_zone_aware_attributes = true
# self.default_timezone = :utc
# end
# end
#
# When the entirety of +activerecord/lib/active_record/base.rb+ has been evaluated then +run_load_hooks+ is invoked.
# The very last line of +activerecord/lib/active_record/base.rb+ is:
#
# ActiveSupport.run_load_hooks(:active_record, ActiveRecord::Base)
#
module ActiveSupport
@load_hooks = Hash.new {|h,k| h[k] = [] }
@loaded = {}