76 lines
2.1 KiB
PHP
76 lines
2.1 KiB
PHP
If you are coming from relational database background it may be familiar to you
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how many-to-many associations are handled: an additional association table is needed.
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In many-to-many relations the relation between the two components is always an aggregate
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relation and the association table is owned by both ends. For example in the case of users and groups
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when user is being deleted the groups it belongs to are not being deleted and the associations between this user
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and the groups it belongs to are being deleted.
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Sometimes you may not want that association table rows are being deleted when user / group is being deleted. You can override
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this behoviour by setting the relations to association component (in this case Groupuser) explicitly.
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In the following example we have Groups and Users of which relation is defined as
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many-to-many. In this case we also need to define an additional class called Groupuser.
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<code type="php">
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class User extends Doctrine_Record {
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public function setUp() {
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$this->hasMany('Group','Groupuser.group_id');
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}
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public function setTableDefinition() {
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$this->hasColumn('name','string',30);
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}
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}
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class Group extends Doctrine_Record {
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public function setUp() {
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$this->hasMany('User','Groupuser.user_id');
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}
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public function setTableDefinition() {
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$this->hasColumn('name','string',30);
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}
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}
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class Groupuser extends Doctrine_Record {
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public function setTableDefinition() {
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$this->hasColumn('user_id','integer');
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$this->hasColumn('group_id','integer');
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}
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}
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$user = new User();
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// add two groups
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$user->Group[0]->name = 'First Group';
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$user->Group[1]->name = 'Second Group';
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// save changes into database
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$user->save();
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// deleting the associations between user and groups it belongs to
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$user->Groupuser->delete();
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$groups = new Doctrine_Collection($conn->getTable('Group'));
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$groups[0]->name = 'Third Group';
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$groups[1]->name = 'Fourth Group';
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$user->Group[2] = $groups[0];
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// $user will now have 3 groups
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$user->Group = $groups;
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// $user will now have two groups 'Third Group' and 'Fourth Group'
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</code>
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