设计：Sesson上的JSON消息#Destroy

Question

我正在尝试在Rails 5应用程序中注销Devise时获取JSON响应消息。

class SessionsController < Devise::SessionsController
    around_action :after_logout_message


    protected

    def after_logout_message
        set_flash_message! :notice, :signed_out
        yield
    end



    private

    def respond_to_on_destroy
        # We actually need to hardcode this as Rails default responder doesn't
        # support returning empty response on GET request
        respond_to do |format|
            format.json { render json: flash }
            format.any(*navigational_formats) { redirect_to after_sign_out_path_for(resource_name) }
        end
    end
end

和我的路线文件

get 'login', to: 'sessions#new', as: :new_user_session
post 'login', to: 'sessions#create', as: :user_session
match 'logout', to: 'sessions#destroy', as: :destroy_user_session, via: Devise.mappings[:user].sign_out_via

为什么这不起作用？其他所有行动似乎都很好。