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View activerecord-3-skip_callbacks.rb
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require 'active_support/basic_object'
 
ActiveRecord::Base.class_eval do
class WithoutCallbacks < ActiveSupport::BasicObject
def initialize(target, types)
@target = target
@types = types
end
def respond_to?(method, include_private = false)
@target.respond_to?(method, include_private)
end
def method_missing(method, *args, &block)
@target.skip_callbacks(*@types) do
@target.send(method, *args, &block)
end
end
end
class << self
def without_callbacks(*types)
WithoutCallbacks.new(self, types)
end
def skip_callbacks(*types)
types = [:save, :create, :update, :destroy, :touch] if types.empty?
deactivate_callbacks(types)
yield.tap do
activate_callbacks(types)
end
end
def deactivate_callbacks(types)
types.each do |type|
name = :"_run_#{type}_callbacks"
alias_method(:"_deactivated_#{name}", name)
define_method(name) { |&block| block.call }
end
end
def activate_callbacks(types)
types.each do |type|
name = :"_run_#{type}_callbacks"
alias_method(name, :"_deactivated_#{name}")
undef_method(:"_deactivated_#{name}")
end
end
end
end

How about rails 4?

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