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在多对多关系表中查找额外的列

database-relations doctrine database-design php

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PatrikAkerstrand · 技术社区 · 15 年前

我希望通过在关联表中拥有一些额外的字段来在多对多关系中持久化一些额外的数据。例如,我想跟踪用户在网络中的角色,如“成员”、“主持人”、“管理员”等。我还想跟踪他/她何时加入网络。现在,我要寻找的是一个有效的方法来检索这些额外的领域使用学说。一个典型的,虽然非常简单,但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 = ?');

那么,考虑到我有一个来自成员关系的用户,有没有任何方法可以“回溯”到networkmembers关系并获取额外的字段?
如果没有,我应该如何重新安排我的模式以使我能够有效地做到这一点?

(也就是说,我不想遍历成员必须查找从中启动的网络并获取角色和成员“自”字段的所有网络)。

我的问题代码说明:

$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?
}

模式如下:

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

1 回复 | 直到 15 年前

1

3

PatrikAkerstrand 15 年前

我自己弄到的,只是采取了一种稍微不同的方法:

// 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
}