Rails 3.控制器中继承回调方法

Question

我有 2 个控制器

OauthController 和 Admin::OauthController。当Admin::OauthController继承自OauthController时。

在 OauthController 中实现了“callback”方法，该方法是公共的。

Admin::OauthController 看起来像：

class Admin::OauthController < OauthController
end

然后，如果我转到链接“/admin/facebook_oauth/callback” 得到错误

Unknown action
The action 'callback' could not be found for Admin::OauthController

但是如果我在 Admin::OauthController 中添加带有 call super 的“回调”方法，则一切正常。

class Admin::OauthController < OauthController    
  def callback
    super
  end
end

这种行为是迁移到Rails 3后出现的。其他方法继承OauthController没有问题。

Answer 1

如果我们在“action_methods”列表中没有所需的操作，则会引发错误“raise ActionNotFound”

AbstractController::Base#internal_methods

# A list of method names that should be considered actions. This
# includes all public instance methods on a controller, less
# any internal methods (see #internal_methods), adding back in
# any methods that are internal, but still exist on the class
# itself. Finally, #hidden_actions are removed.
#
# ==== Returns
# * <tt>array</tt> - A list of all methods that should be considered actions.
def action_methods
  @action_methods ||= begin
    # All public instance methods of this class, including ancestors
    methods = public_instance_methods(true).map { |m| m.to_s }.to_set -
      # Except for public instance methods of Base and its ancestors
      internal_methods.map { |m| m.to_s } +
      # Be sure to include shadowed public instance methods of this class
      public_instance_methods(false).map { |m| m.to_s } -
      # And always exclude explicitly hidden actions
      hidden_actions

    # Clear out AS callback method pollution
    methods.reject { |method| method =~ /_one_time_conditions/ }
  end
end

不要进入最终列表“AbstractController::Base# Internal_methods”

 # A list of all internal methods for a controller. This finds the first
  # abstract superclass of a controller, and gets a list of all public
  # instance methods on that abstract class. Public instance methods of
  # a controller would normally be considered action methods, so methods
  # declared on abstract classes are being removed.
  # (ActionController::Metal and ActionController::Base are defined as abstract)
  def internal_methods
    controller = self
    controller = controller.superclass until controller.abstract?
    controller.public_instance_methods(true)
  end

最后是最有趣的：

>> ActionController::Base.instance_methods.include?('callback')
=> true