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[ci skip] Add Doc of with_options for the case when inherited default options and original options have same keys

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Pramod Sharma 2014-09-25 19:48:26 +05:30 committed by Zachary Scott
parent 0ab075e75f
commit 68fd1a3b23
1 changed files with 15 additions and 1 deletions
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16
activesupport/lib/active_support/core_ext/object/with_options.rb
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@ -47,7 +47,21 @@ class Object
# end
#
# <tt>with_options</tt> can also be nested since the call is forwarded to its receiver.
# Each nesting level will merge inherited defaults in addition to their own.
#
# NOTE: Each nesting level will merge inherited defaults in addition to their own.
#
# class Post < ActiveRecord::Base
# with_options if: :persisted?, length: { minimum: 50 } do
# validates :content, if: -> { content.present? }
# end
# end
#
# The code is equivalent to:
#
# validates :content, length: { minimum: 50 }, if: -> { content.present? }
#
# Hence the inherited default for `if` key is ignored.
#
def with_options(options, &block)
option_merger = ActiveSupport::OptionMerger.new(self, options)
block.arity.zero? ? option_merger.instance_eval(&block) : block.call(option_merger)