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6.4. Relations - 6.3. Named Scopes
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6.4. Relations
| Author | Dariusz Górecki |
|---|
- In NoSQL World Relations are not so obvious as in RDBMS
- Because NoSQL databases are designed for performance, there is no need of defining something more complex than correct use of find() method and indexing for fetching related records
- This is just an idea/concept/example you can do things in yours preferred way! this is schema-less world, think different!
- MongoDB Documentation has a clean examples and how-to's for handling relations, please read them for better understanding of relations in NoSQL world
HAS_ONE relation
// just define method in yours model class (assume we have client collection, and address collection in client model public function address() { return Address::model()->findByAttributes(array('attribute_with_client_id'=>$this->primaryKey())); }
BELONGS_TO relation
// define in address model public function client() { return Client::model()->findByPk($this->attribute_with_client_id); }
HAS_MANY relation
// assume we have clients and orders collection // define in client: public function orders() { return Client::model()->findAllByAttributes(array('client_id'=>$this->primaryKey())); }
MANY_MANY relation
As simple as defining reverse HAS_MANY relation in orders model. You can view the Example models for details.
- 6.4. Relations
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