提交按钮不保存我的订阅者Ruby on rails

# app/models/subscriber.rb
class Subscriber < ApplicationRecord
  validates :email, presence: true, format: { with: URI::MailTo::EMAIL_REGEXP }
end

# app/controllers/subscribers_controller.rb
class SubscribersController < ApplicationController
  def create
    @subscriber = Subscriber.new(subscriber_params)
    if @subscriber.save
      redirect_to root_path, notice: 'Subscriber was successfully created.'
    else
      render :new
    end
  end

  private

  def subscriber_params
    params.require(:subscriber).permit(:email)
  end
end

<!-- app/views/subscribers/new.html.erb -->
<%= form_with model: @subscriber, local: true do |form| %>
  <% if @subscriber.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@subscriber.errors.count, "error") %> prohibited this subscriber from being saved:</h2>
      <ul>
        <% @subscriber.errors.full_messages.each do |message| %>
          <li><%= message %></li>
        <% end %>
      </ul>
    </div>
  <% end %>

  <div class="field">
    <%= form.label :email %>
    <%= form.text_field :email %>
  </div>

  <div class="actions">
    <%= form.submit %>
  </div>
<% end %>