Doctrine_manual-1-2-en

Chapter 7: Defining Models 77
Here is the same example in YAML format. You can read more about YAML in the YAML
Schema Files (page 195) chapter:
---
# schema.yml
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# ...
UserGroup:
columns:
user_id:
type: integer
primary: true
group_id:
type: integer
primary: true
Notice how the relationship is bi-directional. Both User has many Group and Group has
many User. This is required by Doctrine in order for many-to-many relationships to fully
work.
Now lets play around with the new models and create a user and assign it some groups. First
create a new User instance:
// test.php
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// ...
$user = new User();
Now add two new groups to the User:
// test.php
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// ...
$user->Groups[0]->name = 'First Group';
$user->Groups[1]->name = 'Second Group';
Now you can save the groups to the database:
// test.php
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// ...
$user->save();
Now you can delete the associations between user and groups it belongs to:
// test.php
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// ...
$user->UserGroup->delete();
$groups = new Doctrine_Collection(Doctrine_Core::getTable('Group'));
$groups[0]->name = 'Third Group';
$groups[1]->name = 'Fourth Group';
$user->Groups[2] = $groups[0];
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