有belongs_to的关联的has_many

我得到的@user.posts.create错误unknown attribute: user_id durring执行在我的规格有belongs_to的关联的has_many

用户类别创建

class User < ActiveRecord::Base 
    # new columns need to be added here to be writable through mass assignment 
    attr_accessible :username, :email, :password, :password_confirmation 

    has_many :posts, :dependent => :destroy 
end

Post类

class Post < ActiveRecord::Base 
    attr_accessible :title, :body 

    belongs_to :user 
end

DB模式

ActiveRecord::Schema.define(:version => 20111214045425) do 

    create_table "posts", :force => true do |t| 
    t.string "title" 
    t.string "body" 
    t.integer "user_id" 
    t.datetime "created_at" 
    t.datetime "updated_at" 
    end 

    create_table "users", :force => true do |t| 
    t.string "username" 
    t.string "email" 
    t.string "password_hash" 
    t.string "password_salt" 
    t.datetime "created_at" 
    t.datetime "updated_at" 
    end 

end

有什么帮助吗？我遵循了使用ActiveRecord所能找到的每个指南。我想要做的就是创建一个关联用户的职位。

来源

2011-12-14 BeMathis

尝试更改为的has_many：帖子，CLASS_NAME => “邮报”，：foreign_key => “USER_ID”：依赖=> “消灭”和belongs_to的：用户：CLASS_NAME =>用户，：foreign_key => “user_id”。有时候，ActiveRecord可能有点怪异。不要忘记重新启动服务器 – Hishalv 2011-12-14 08:44:48

你确定'user_id`列存在于`posts`表中吗？ – Mischa 2011-12-14 08:50:31

您可以使用

@user = User.find(1) 
@post = @user.posts.build(posts_attributes_as_hash) 
@post.save

甚至

post = Post.new(posts_attributes) 
@user = User.find(1) 
@user.posts << post

编辑

要使用直接创建：

@user = User.find(1) 
@post = @user.posts.create(posts_attributes_as_hash)

欲了解更多信息，看看has_many-association-referenceË特别是在部分称为4.3.1 Methods Added by has_many

新编辑：

我创建了一个新的项目，你的代码，并在铁轨控制台我想下面的命令

User.create(:username => "UserNamedTest", :email => "[email protected]") 

SQL (13.6ms) INSERT INTO "users" ("created_at", "email", "password_hash", "password_salt", "updated_at", "username") VALUES (?, ?, ?, ?, ?, ?) [["created_at", Wed, 14 Dec 2011 09:02:46 UTC +00:00], ["email", "[email protected]"], ["password_hash", nil], ["password_salt", nil], ["updated_at", Wed, 14 Dec 2011 01:03:26 UTC +00:00], ["username", "UserNamedTest"]] 

=> #<User id: 2, username: "UserNamedTest", email: "[email protected]", password_hash: nil, password_salt: nil, created_at: "2011-12-14 09:02:46", updated_at: "2011-12-14 09:02:46"> 

user = User.find_by_username("UserNamedTest") 

User Load (0.2ms) SELECT "users".* FROM "users" WHERE "users"."username" = 'UserNamedTest' LIMIT 1 

=> #<User id: 2, username: "UserNamedTest", email: "[email protected]", password_hash: nil, password_salt: nil, created_at: "2011-12-14 09:02:46", updated_at: "2011-12-14 09:02:46"> 

new_post = user.posts.create(:title => "just a test", :body =>"body of article test") 

SQL (0.5ms) INSERT INTO "posts" ("body", "created_at", "title", "updated_at", "user_id") VALUES (?, ?, ?, ?, ?) [["body", "body of article test"], ["created_at", Wed, 14 Dec 2011 09:03:59 UTC +00:00], ["title", "just a test"], ["updated_at", Wed, 14 Dec 2011 09:03:59 UTC +00:00], ["user_id", 2]] 

=> #<Post id: 2, title: "just a test", body: "body of article test", user_id: 2, created_at: "2011-12-14 09:03:59", updated_at: "2011-12-14 09:03:59"> 

irb(main):022:0> new_post.inspect 
=> "#<Post id: 2, title: \"just a test\", body: \"body of article test\", user_id: 2, created_at: \"2011-12-14 09:03:59\", updated_at: \"2011-12-14 09:03:59\">"

从我看到的代码是确定的，在后创建没有错误

来源

2011-12-14 08:29:05 cristian

转储test.sqlite3架构后发现了问题。 user_id未被定义为数据库中的列。清理数据库并运行rake spec迁移数据库并修复所有内容。

来源

2011-12-14 20:24:23 BeMathis

有belongs_to的关联的has_many

回答

相关问题