如何创建一个新的记录的许多一对多通过接受嵌套属性的关联？

问题描述

组织和用户有很多-to-many关联到关系。起初我这实现了一个1-to-many关联，它的工作，但现在我需要它成为一个经过多次-to-many关联。所以，我创建了相关模型和模型文件改变了关联。

组织接受嵌套的用户属性在我的应用我有两个一个加盟申请表。另外，我用它在我的种子文件：

  Organization.create（名称：名称，...）！users.create（电子邮件：[e-mail]，...）
 

这工作时，这是一个1-to-many关联，但现在它是一个多一对多通过协会，它产生于无欲无求的错误：

 验证失败：成员不能为空，主持人不能为空
 

这是指，为相关模型变量通过用户和组织相关联。

是什么原因导致这个错误;为什么这些价值观空白？是 Organization.create 行可能不正确的使用many-to-many关联？ 成员和主持人有默认值（见迁移文件）。我希望它创建组织，用户和关系使用默认值。我怎么回事，应建立一个新的组织和用户？

---

本组织模型：

 的has_many：关系，依赖：摧毁
的has_many：用户，通过：关系accepts_nested_attributes_for：关系：reject_if =＆GT; ：all_blank，：allow_destroy =＆GT;真正
validates_associated：用户
 

关系模式：

  belongs_to的：组织
belongs_to的：用户
accepts_nested_attributes_for：用户validates_ presence_of：组织
validates_ presence_of：用户
验证：会员，presence：真
验证：主持人，presence：真
 

用户模型：

 的has_many：关系，依赖：摧毁
的has_many：组织，通过：人际关系，inverse_of：用户
 

的关系迁移：

 类CreateRelationships＆LT; ActiveRecord的::迁移
  高清变化
    CREATE_TABLE：关系做| T |
      t.belongs_to：用户指标：真
      t.belongs_to：组织，指数：真      t.boolean：成员，空：假的，默认值：false
      t.boolean：主持人，空：假的，默认值：false
      t.timestamps空：假的
    结束
    add_index：人际关系，[：USER_ID，：organization_id]，独特的：真
  结束
结束
 

解决方案

我觉得你的问题，也许你还没有指定一个外键为用户模型的has_many关系。尝试：

 的has_many：人际关系，foreign_key：organization_id，取决于：摧毁
 

这唯一标识每个关系的组织，你的用户模型。

Organization and User have a many-to-many association through Relationship. Initially I implemented this a 1-to-many association, which worked but now I need it to become a many-to-many through association. So I created the Relationship model and changed the association in the model files.

Organization accepts nested attributes for User as in my app I have a joined signup form for the two. Also, I use it in my seeds file:

Organization.create!(name: "name", ...).users.create(email: "[e-mail]", ...)

This worked when it was a 1-to-many association but now it is a many-to-many through association, it produces upon seeding the error:

Validation failed: Member can't be blank, Moderator can't be blank 

This refers to variables for the Relationship model, through which User and Organization are associated.

What causes this error; why are these values blank? Is the Organization.create line perhaps incorrect for a many-to-many association? member and moderator have default values (see migration file). I would expect it to create the organization, user, and relationship with default values. How else should I be creating a new organization and user?

---

The Organization model:

has_many :relationships, dependent: :destroy
has_many :users, through: :relationships

accepts_nested_attributes_for :relationships, :reject_if => :all_blank, :allow_destroy => true
validates_associated :users

The Relationship model:

belongs_to :organization
belongs_to :user
accepts_nested_attributes_for :user

validates_presence_of :organization
validates_presence_of :user
validates :member, presence: true
validates :moderator, presence: true

The User model:

has_many :relationships, dependent: :destroy 
has_many :organizations, through: :relationships, inverse_of: :users

The relationship migration:

class CreateRelationships < ActiveRecord::Migration
  def change
    create_table :relationships do |t|
      t.belongs_to :user, index: true
      t.belongs_to :organization, index: true

      t.boolean :member, null: false,  default: false
      t.boolean :moderator, null: false,  default: false
      t.timestamps null: false
    end
    add_index :relationships, [:user_id, :organization_id], unique: true
  end
end

解决方案

I think your problem maybe that you haven't specified a "foreign key" for the has_many relationships in User Model. Try:

has_many :relationships, foreign_key: "organization_id", dependent: :destroy

This uniquely identifies an organization per relationship with your user model.

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