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require 'active_support/option_merger'
class Object
# An elegant way to factor duplication out of options passed to a series of
# method calls. Each method called in the block, with the block variable as
# the receiver, will have its options merged with the default +options+ hash
# provided. Each method called on the block variable must take an options
# hash as its final argument.
#
# Without with_options, this code contains duplication:
#
# class Account < ActiveRecord::Base
# has_many :customers, :dependent => :destroy
# has_many :products, :dependent => :destroy
# has_many :invoices, :dependent => :destroy
# has_many :expenses, :dependent => :destroy
# end
#
# Using with_options, we can remove the duplication:
#
# class Account < ActiveRecord::Base
# with_options :dependent => :destroy do |assoc|
# assoc.has_many :customers
# assoc.has_many :products
# assoc.has_many :invoices
# assoc.has_many :expenses
# end
# end
#
# It can also be used with an explicit receiver:
#
# map.with_options :controller => "people" do |people|
# people.connect "/people", :action => "index"
# people.connect "/people/:id", :action => "show"
# end
#
def with_options(options)
yield ActiveSupport::OptionMerger.new(self, options)
end
end
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