Question

I have just created a new project with a many-to-many relation (User-Group) and the code below.

As you can guess in the code I’m trying to assign manually groups to a user, but it doesn’t assign it anything…any idea?

User:
  columns:
    id: 
      type: integer(4)
      autoincrement: true
      primary: true
    username:
      type: string(255)
    password:
      type: string(255)
  attributes:
    export: all 
    validate: true

Group:
  tableName: group_table
  columns:
    id: 
      type: integer(4)
      autoincrement: true
      primary: true
    name:
      type: string(255)
  relations:
    Users:
      foreignAlias: Groups
      class: User
      refClass: GroupUser

GroupUser:
  columns:
    group_id:
      type: integer(4)
      primary: true
    user_id:
      type: integer(4)
      primary: true
  relations:
    Group:
      foreignAlias: GroupUsers
    User:
      foreignAlias: GroupUsers

The code is this:

  public function executeIndex(sfWebRequest $request)
  {
    $user = Doctrine_Core::getTable('User')->find(1);

    $groups = Doctrine_Core::getTable('Group')->findAll();

    $user->setGroups($groups);

    $user->save();
    $this->forward('default', 'module');
  }

Answer 1

Try defining the relation in the User entity too (and don’t using foreingAlias in Groups). Also use the local and foreign fields.
So, schema.yml should look like:

User:
  ...
  relations:
    Groups:
      class: Group
      refClass: GroupUser
      local: user_id
      foreign: group_id

Group:
  ...
  relations:
    Users:
      class: User
      refClass: GroupUser
      local: group_id 
      foreign: user_id

If that doesn’t work, I think you can set the groups with the Doctrine “link” method.
See Record.php (probably in lib/vendor/symfony/lib/plugins/sfDoctrinePlugin/lib/vendor/doctrine/Doctrine folder)

Example:

$groups_ids = array();
foreach($groups as $group) $groups_ids[] = $group->getId();
$user->link('Groups',$groups_ids);

Also, if you are trying only to add instances to that relation (and you hate the person who will fix your code in the future) you can create N-GroupUsers
Example:

foreach($groups as $group) {
    $ug = new GroupUser();
    $ug->setUserId($user->getId());
    $ug->setGroupId($user->getId());
    $ug->save();
}

Please, use the first option and let me know if any of this works for you!