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Chapter 12: YAML Schema Files 204 Listing 12-20 $this->index('name_index', array( 'fields' => array( 'first_name' => array( 'sorting' => 'ASC', 'length' => '10', 'primary' => true ), 'last_name' => array()), 'type' => 'unique' ) ); Inheritance Below we will demonstrate how you can setup the different types of inheritance using YAML schema files. Simple Inheritance --- Entity: columns: name: string(255) username: string(255) password: string(255) User: inheritance: extends: Entity type: simple Group: inheritance: extends: Entity type: simple Any columns or relationships defined in models that extend another in simple inheritance will be moved to the parent when the PHP classes are built. Listing 12-21 You can read more about this topic in the :section Simple (page 231) chapter. Concrete Inheritance --- TextItem: columns: topic: string(255) Comment: inheritance: extends: TextItem type: concrete columns: content: string(300) You can read more about this topic in the :section Concrete (page 232) chapter. ----------------- Brought to you by
Chapter 12: YAML Schema Files 205 Column Aggregation Inheritance Like simple inheritance, any columns or relationships added to the children will be automatically removed and moved to the parent when the PHP classes are built. First lets defined a model named Entity that our other models will extend from: --- Entity: columns: name: string(255) type: string(255) Listing 12-22 The type column above is optional. It will be automatically added when it is specified in the child class. Now lets create a User model that extends the Entity model: --- User: inheritance: extends: Entity type: column_aggregation keyField: type keyValue: User columns: username: string(255) password: string(255) Listing 12-23 The type option under the inheritance definition is optional as it is implied if you specify a keyField or keyValue. If the keyField is not specified it will default to add a column named type. The keyValue will default to the name of the model if you do not specify anything. Again lets create another model that extends Entity named Group: --- Group: inheritance: extends: Entity type: column_aggregation keyField: type keyValue: Group columns: description: string(255) Listing 12-24 The User username and password and the Group description columns will be automatically moved to the parent Entity. You can read more about this topic in the :section Column Aggregation (page 235) chapter. ----------------- Brought to you by
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