nuke_all_callbacks_from_space.rb

# View
model = MY_MODEL_NAME
model.methods.select { |method| method.to_s =~ /^_{1}[^_].+_callbacks$/ }
     .each_with_object({}) { |method, memo| memo[method] = model.send(method).group_by(&:kind)
     .each { |_, callbacks| callbacks.map! { |callback| callback.raw_filter } } }

# Nuke
%i(initialize validate create update save destroy validation find touch commit rollback).each do |event|
  reset_callbacks event
end