问Rails 4 has_secure_password

EN

RuntimeError:
   Password digest missing on new record

class User < ActiveRecord::Base # User.rb
  has_secure_password
end

class UsersController < ApplicationController 

  def new
    @user = User.new
  end

 def create
   @user = User.new(user_params)
     if @user.save
       redirect_to root_path, notice: "Thank you for signing up!"
     else
      render "new"
    end
  end

private

  def user_params
    params.require(:user).permit(:email, :name, :password, :password_confirmation)
  end
end

create_table "users", force: true do |t| #db/schema.rb (edited for brevity)
  t.string   "email"
  t.string   "name"
  t.text     "password_digest"
  t.datetime "created_at"
  t.datetime "updated_at"
end