Method: DataMapper::Hook::ClassMethods#define_hook_stack_execution_methods

Defined in:
lib/dm-core/support/hook.rb

#define_hook_stack_execution_methods(target_method, scope) ⇒ Object

Defines two methods. One method executes the before hook stack. The other executes the after hook stack. This method will be called many times during the Class definition process. It should be called for each hook that is defined. It will also be called when a hook is redefined (to make sure that the arity hasn’t changed).



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# File 'lib/dm-core/support/hook.rb', line 226

def define_hook_stack_execution_methods(target_method, scope)
  unless registered_as_hook?(target_method, scope)
    raise ArgumentError, "#{target_method} has not be registered as a hookable #{scope} method"
  end

  hooks = hooks_with_scope(scope)

  before_hooks = hooks[target_method][:before]
  before_hooks = before_hooks.map{ |info| inline_call(info, scope) }.join("\n")

  after_hooks  = hooks[target_method][:after]
  after_hooks  = after_hooks.map{ |info| inline_call(info, scope) }.join("\n")

  before_hook_name = hook_method_name(target_method, 'execute_before', 'hook_stack')
  after_hook_name  = hook_method_name(target_method, 'execute_after',  'hook_stack')

  hooks[target_method][:in].class_eval <<-RUBY, __FILE__, __LINE__ + 1
    #{scope == :class ? 'class << self' : ''}

    private

    remove_method :#{before_hook_name} if instance_methods(false).any? { |m| m.to_sym == :#{before_hook_name} }
    def #{before_hook_name}(*args)
      #{before_hooks}
    end

    remove_method :#{after_hook_name} if instance_methods(false).any? { |m| m.to_sym == :#{after_hook_name} }
    def #{after_hook_name}(*args)
      #{after_hooks}
    end

    #{scope == :class ? 'end' : ''}
  RUBY
end