在Lynda Rails 3教程中一对多关联练习中的Rails语法错误

Question

问题是什么，我怎么解决它?

当在rails控制台我运行page.editors

并得到以下语法错误:

...simple_cms/app/models/admin_user.rb:8: syntax error, unexpected ':', expecting keyword_end
  scope: named, lambda {|first,last| ...
        ^
...simple_cms/app/models/admin_user.rb:8: syntax error, unexpected 'n', expecting :: or '[' or '.'

admin_user.rb

class AdminUser < ActiveRecord::Base
  attr_accessible :title, :body, :username, :first_name, :last_name
  # To configure a different table name
  # set_table_name("admin_users")
  has_and_belongs_to_many :pages
  scope: named, lambda {|first,last| where(:first_name => first, :last_name => last)}
end

page.rb

class Page < ActiveRecord::Base
  attr_accessible :title, :body, :name, :permalink, :position
  belongs_to :subject
  has_many :sections
  has_and_belongs_to_many :editors, :class_name => "AdminUser"
end

alter_users.rb

class AlterUsers < ActiveRecord::Migration
  def up
    rename_table("users", "admin_users")
    add_column("admin_users", "username", :string, :limit => 25)
    change_column("admin_users", "email", :string, :limit => 100)
    rename_column("admin_users", "password", "hashed_password")
      add_column("admin_users", "salt", :string, :limit => 40)
      puts "*** About to add an index ***"
      add_index("admin_users", "username")
  end
  def down
    remove_index("admin_users", "username")
    remove_column("admin_users", "salt")
    rename_column("admin_users", "hashed_password", "password")
    change_column("admin_users", "email", :string, :default => "", :null => false)
    remove_column("admin_users", "username")
    rename_table("admin_users", "users")
  end
end

create_admin_users_pages_join.rb

class CreateAdminUsersPagesJoin < ActiveRecord::Migration
  def up
    create_table :admin_users_pages, :id => false do |t|
        t.integer "admin_user_id"
        t.integer "page_id"
    end
    add_index :admin_users_pages, ["admin_user_id", "page_id"]
  end
  def down
    drop_table :admin_users_pages
  end
end

不要读这一行以下的内容:Stack Overflow希望我添加更多的文本，因为这个问题有很多代码。但我认为有代码会帮助那些想要帮助我的人:)

Answer 1

去掉scope上的冒号，放在named:

前面

scope: named, lambda {|first,last| ...
scope :named, lambda {|first,last| ...