在多对多关系表中查找额外的列

Question

我希望通过在关联表中包含一些额外的字段来在多对多关系中保留一些额外的数据。例如，我想跟踪用户在网络中的角色，例如“成员”、“主持人”、“管理员”等。我还想跟踪他/她加入网络的时间。现在，我正在寻找一种使用 Doctrine 检索这些额外字段的有效方法。一个典型的（虽然非常简单）DQL 查询可能如下所示：

// find.network.by.slug
Doctrine_Query::create()
    ->select('*')
    ->from('Network n')
    ->leftJoin('n.Members u')
    ->where('n.slug = ?');

1. 因此，鉴于我有一个来自 Members 关系的 User，有什么方法可以“回溯”到 NetworkMembers 关系并获取额外的字段？

2. 如果没有，该怎么做我重新安排我的架构以使我能够有效地完成此操作？

   （即我不想遍历成员必须找到的所有网络来查找我开始的网络并获取角色和member_since字段）。

我的问题的代码说明：

$networkTable = Doctrine::getTable('Network');
$network = $networkTable->executeOne('find.network.by.slug', $slug);
$members = $network->Members;
foreach($members as $member) {
   // How do I access the fields in the NetworksMember association?
}

架构如下：

---

User:
  tableName: users
  columns:
    user_id:
      name: user_id as userId
      type: integer(8)
      unsigned: 1
      primary: true
      autoincrement: true
    username:
      type: string(30)
      notnull: true
      unique: true
  relations:
    Networks:
      class: Network
      local: user_id
      foreign: network_id
      refClass: NetworkMembers
      type: many

---

Network:
  tableName: networks
  actAs:
    Sluggable:
      unique: true
      fields: [name]
      canUpdate: true
    Timestampable:
  columns:
    id:
      type: integer(8)
      unsigned: 1
      primary: true
      autoincrement: true
    name:
      type: string(64)
      notnull: true
  relations:
    Members:
      class: User
      type: many
      refClass: NetworkMembers
      local: network_id
      foreign: user_id
      foreignAlias: Networks
      foreignType: many

---

NetworkMembers:
  actAs:
    Timestampable:
      created:
        name: member_since as memberSince
        type: timestamp
      updated:
        disabled: true
  columns:
    networkId:
      name: network_id as networkId
      type: integer(8)
      unsigned: 1
      primary: true
    userId:
      name: user_id as userId
      type: integer(8)
      unsigned: 1
      primary: true
    role:
      type: enum
      values: [member, moderator, admin]
      default: member
  relations:
    Network:
      type: one
      local: network_id
      foreign: id
    Member:
      class: User
      type: one
      local: user_id
      foreign: user_id

---

Answer 1

我自己得到了它，只是需要采取稍微不同的方法：

// find.network.by.slug
        Doctrine_Query::create()
            ->select('*')
            ->from('Network n')
            ->leftJoin('n.NetworkMembers nm')
            ->leftJoin('nm.Member u')
            ->leftJoin('n.Founder f')
            ->leftJoin('n.Icon icon')
            ->where('n.slug = ?')

// later:
$members = $this->network->NetworkMembers;
foreach($members as $networkMember) {
   echo $networkMember->Member->username;
   echo $networkMember->role; // Here I can access the 
                              // NetworkMember association directly
}