Rails验证错误未显示

由于某些原因，我的验证错误已被提取，但未显示在页面上，因为我希望下面是我的模型和新视图。我还将附上一张我的验证错误但未在视图中显示的图片。

Model

class Review < ApplicationRecord
  belongs_to :user
  belongs_to :tea

  validates :title, presence: true
  validates :rating, numericality: {only_integer: true, greater_than_or_equal_to: 0, less_than: 11}
  validates :tea, uniqueness: {scope: :user, message: "has already been reviewed by you" }

  scope :order_by_rating, ->{group(:id).order('avg(reviews.rating) desc')}
end

View
<h1>Write a Review for  </h1>

<%= form_for Review.new do |f|%>
    <% if @review.errors.any? %>
        <h2>Errors:</h2>
        <ul>    
            <% @review.errors.full_messages.each do |message| %>
            <li><%= message %></li>
           <% end %> 
        </ul>
    <% end %>