Added custom ActiveSupport callback helper do disable the execution of a given callback for a yielded block.

lib/core_ext/activesupport/lib/active_support/callbacks.rb

@@ -0,0 +1,33 @@
+module ActiveSupport::Callbacks::ClassMethods
+  # Performs actions on a ActiveSupport model without triggering the given callback.
+  # The parameters are the same as for `skip_callback` and `set_callback`:
+  # http://api.rubyonrails.org/classes/ActiveSupport/Callbacks/ClassMethods.html
+  #
+  # Keep in mind that variables defined inside the block are only valid there. If you need
+  # to access one after the block has been processed make sure to initialize the variable
+  # before the block. This is the same behaviour as for all blocks.
+  #
+  # ATTENTION: This is not thread-safe and should not be used in threaded environment.
+  #
+  # @param name [Symbol] The name of the callback like e.g. :save
+  # @param when [Symbol] Indicates the time when the callback should run like e.g. :before
+  # @param method [Symbol] The name of the method that should get disabled e.g. :some_example_method
+  #
+  # @example
+  #  User.without_callback(:create, :after, :avatar_for_email_check) do
+  #    User.create(...)
+  #    'example return value'
+  #  end
+  #  #=> 'example return value'
+  #
+  # @return [optional] Returns the return value of the given block
+  def without_callback(*args)
+    begin
+      skip_callback(*args)
+      result = yield
+    ensure
+      set_callback(*args)
+    end
+    result
+  end
+end