NoMethodError in Devise::RegistrationsController#edit 用Devise套件作為系統的帳號管理功能，結果在這個檔案出現錯誤． app/controller/application_controller.rb class ApplicationController < ActionController::Base # Prevent CSRF attacks by raising an exception. # For APIs, you may want to use :null_session instead. protect_from_forgery with: :exception before_action :configure_permitted_parameters , if: :devise_controller ? protected def configure_permitted_parameters devise_parameter_sanitizer . for ( :sign_up ) { | u | u.permit( :username , :email , :password , :password_confirmation , :remember_me , :avatar , :avatar_cache ) } devise_parameter_sanitizer . for ( :account_update ) { | u | u.permit( :username , :password , :password_confirmation , :current_password , :avatar ) } end end 只要將for修正成permit，就可以了． def configure_permitted_parameters devise_parameter_sanitizer .permit ( :sign_up ) ...