Toggle “ActionController::Parameters.action_on_unpermitted_parameters = :raise” on specific controller methods?

问题

I want to use

ActionController::Parameters.action_on_unpermitted_parameters = :raise

To raise an exception unpermitted parameters are passed in, but I only want to do this on specific controller methods, instead of setting it in /config/ and having it apply to the whole environment. Is there any way to do so?

回答1:

Update: (taking inspiration from Mike's answer)

To restrict the change only for a set of controller actions and to revert it back to the original value that the class attribute was holding before the action being invoked, we can use around_action

class SomeController < ApplicationController
  around_action :raise_action_on_unpermitted_parameters, only: %i[create update]

  def index
    # ...
  end

  def create
    # ...
  end

  def update
    # ...
  end

  private

  def raise_action_on_unpermitted_parameters
    original = ActionController::Parameters.action_on_unpermitted_parameters
    ActionController::Parameters.action_on_unpermitted_parameters = :raise
    yield
  ensure
    ActionController::Parameters.action_on_unpermitted_parameters = original
  end
end

回答2:

I'm not sure Wasif's answer will work properly because it never sets it back. At a minimum I think you want this:

class SomeController < ApplicationController
  around_action :raise_action_on_unpermitted_parameters, only: %i[create update]

  def index
    # ...
  end

  def create
    # ...
  end

  def update
    # ...
  end

  private

  def raise_action_on_unpermitted_parameters
    begin
      ActionController::Parameters.action_on_unpermitted_parameters = :raise
      yield
    ensure
      ActionController::Parameters.action_on_unpermitted_parameters = :log
    end
  end
end

And even then I'm not sure you won't encounter a race condition where it's set to raise on different controller actions accidentally if you're using a multithreaded server like Puma.

来源：https://stackoverflow.com/questions/47693233/toggle-actioncontrollerparameters-action-on-unpermitted-parameters-raise