当我想要恢复密码时，Rails会设计Gem (用于nil:NilClass的未定义方法`to_datetime

def some_method(input)
  if input.present?
    datetime = input.to_datetime
    # 处理 datetime
  else
    # 处理 nil 情况
  end
end

def some_method(input)
  datetime = input.try(:to_datetime)
  if datetime
    # 处理 datetime
  else
    # 处理 nil 情况
  end
end

def some_method(input)
  datetime = input&.to_datetime
  if datetime
    # 处理 datetime
  else
    # 处理 nil 情境
  end
end

class PasswordResetsController < ApplicationController
  def create
    user = User.find_by(email: params[:email])
    if user
      user.send_password_reset_email
      flash[:notice] = "Email sent with password reset instructions."
    else
      flash[:error] = "Email not found."
    end
  end
end

class UsersController < ApplicationController
  before_action :set_user, only: [:show, :edit, :update, :destroy]

  def set_user
    @user = User.find(params[:id])
  rescue ActiveRecord::RecordNotFound
    flash[:error] = "User not found."
    redirect_to root_url
  end
end