Bcrypt和Rails只需输入密码即可找到管理员用户

Question

我正在构建一个包含3个模型的应用（客户，积分，管理员）。客户拥有积分，积分属于客户。然后Admin将user_name和password_hash作为属性，通过Bcrypt存储密码。一旦客户通过电话号码搜索自己，他们的积分就会显示出来。但要添加积分，管理员只需使用密码（4位数代码）登录，即可访问添加点。

我无法通过密码找到管理员，而不是用户名和密码。

 class AdminsController < ApplicationController

 def new
   @admin = Admin.new
 end

 def create
   @Admin = Admin.new(admin_params)
   if @admin.save
     redirect_to root_path
   else
     flash[:error] = "incorrect data, please check form"
     render new_admin_path
   end
 end

 def login
   @customer = Customer.find(params[:id])

 # Need to get the input password
  params[:password]
 # Change the inputed password into a password hash
 # inputed_password_hash (NEED HELP HERE)

 # Compare the password hash with password hashes in the Admin model/database 
 # to see if it exists.
 # if true, send to add points page
 # if false, send back to customer page

   if Admin.find_by(password_hash: inputed_password_hash)
     redirect_to new_points_path
   else
     render customer_path 
   end
 end

   private

   def admin_params
     params.require(:admin).permit(:user_name, :password, :password_confirmation)
   end
 end