rails中非模型字段的错误

class User< ApplicationRecord
  attr_accessor :email
end

class User< ApplicationRecord
  include ActiveModel::Validations
  attr_accessor :email
  validates :email, presence: true, format: { with: URI::MailTo::EMAIL_REGEXP }
end

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

<%= form_with(model: user, local: true) do |form| %>
  <%= form.label :email %>
  <%= form.text_field :email %>
  <%= form.submit "Submit" %>
<% end %>