第11章Micheal Hartl错误

我在Michael Hartl的书上做了Sample App，在第11章中有一些错误

显示/home/andrey/RoR/sample_app/app/views/shared/_stats.html.erb，其中第5行引发：

未知的验证者：'PresenseValidator'

提取的来源（第5行）：

5 <％= @ user.followed_users.count％>

模板包含跟踪：app / views / static_pages / home.html.erb

Rails.root：/ home / andrey / RoR / sample_app应用程序跟踪|框架跟踪|完整追踪

app / models / relationship.rb：4：在 <class:Relationship>' app/models/relationship.rb:1:in 'app / views / shared / _stats.html.erb：5：in _app_views_shared__stats_html_erb__765092261__621887978' app/views/static_pages/home.html.erb:8:in _app_views_static_pages_home_html_erb__496074363__614039518'

user.rb

class User <ActiveRecord :: Base has_many：microposts，dependent :: destroy has_many：relationships，foreign_key：“follower_id”，dependent :: destroy has_many：follows_users，through :: relationship，source ::: follow has_many：reverse_relationships，foreign_key：“followed_id “，class_name：”Relationships“，依赖:: destroy has_many：followers，through :: reverse_relationships，source :: follower

before_save before_create：create_remember_token

验证：name，presence：true，length：{maximum：50}

VALID_EMAIL_REGEX = / \ A [\ w - . ] @ [a-z \ d-]（ . [a-z]）* . [a-z] \ z / i

验证：电子邮件，在线状态：true，格式：{with：VALID_EMAIL_REGEX}，唯一性：{case_sensitive：false}

has_secure_password

验证：密码，长度：{minimum：6}

def User.new_remember_token SecureRandom.urlsafe_base64结束

def User.encrypt（token）Digest :: SHA1.hexdigest（token.to_s）结束

def feed Micropost.where（“user_id =？”，id）结束

def follow？（other_user）relationships.find_by（followed_id：other_user.id）结束

def follow！（other_user）relationships.create！（follow_id：other_user.id）结束

def unfollow！（other_user）relationships.find_by（followed_id：other_user.id）.destroy！结束

私人的

def create_remember_token
  self.remember_token = User.encrypt(User.new_remember_token)
end

结束

stats.erb.html

<% @user ||= current_user %>
 <div class="stats">
 <a href="<%= following_user_path(@user) %>">
 <strong id="following" class="stat">
  <%= @user.followed_users.count %>
 </strong>
 following
 </a>
 <a href="<%= followers_user_path(@user) %>">
 <strong id="followers" class="stat">
  <%= @user.followers.count %>
 </strong>
 followers
 </a>
 </div>

relationship.rb

class Relationship <ActiveRecord :: Base belongs_to：follower，class_name：“User”belongs_to：follow，class_name：“User”validates：follower_id，presense：true validates：follows_id，presense：true end