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Association.php
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Association.php
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<?php
/**
* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
* Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
*
* Licensed under The MIT License
* For full copyright and license information, please see the LICENSE.txt
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
* @link http://cakephp.org CakePHP(tm) Project
* @since CakePHP(tm) v 3.0.0
* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
*/
namespace Cake\ORM;
use Cake\Event\Event;
use Cake\ORM\Entity;
use Cake\ORM\Table;
use Cake\ORM\TableRegistry;
use Cake\Utility\Inflector;
/**
* An Association is a relationship established between two tables and is used
* to configure and customize the way interconnected records are retrieved.
*
*/
abstract class Association {
/**
* Strategy name to use joins for fetching associated records
*
* @var string
*/
const STRATEGY_JOIN = 'join';
/**
* Strategy name to use a subquery for fetching associated records
*
* @var string
*/
const STRATEGY_SUBQUERY = 'subquery';
/**
* Strategy name to use a select for fetching associated records
*
* @var string
*/
const STRATEGY_SELECT = 'select';
/**
* Association type for one to one associations.
*
* @var string
*/
const ONE_TO_ONE = 'oneToOne';
/**
* Association type for one to many associations.
*
* @var string
*/
const ONE_TO_MANY = 'oneToMany';
/**
* Association type for many to many associations.
*
* @var string
*/
const MANY_TO_MANY = 'manyToMany';
/**
* Name given to the association, it usually represents the alias
* assigned to the target associated table
*
* @var string
*/
protected $_name;
/**
* Whether this association can be expressed directly in a query join
*
* @var boolean
*/
protected $_canBeJoined = false;
/**
* The class name of the target table object
*
* @var string
*/
protected $_className;
/**
* The name of the field representing the foreign key to the table to load
*
* @var string|array
*/
protected $_foreignKey;
/**
* A list of conditions to be always included when fetching records from
* the target association
*
* @var array
*/
protected $_conditions = [];
/**
* Whether the records on the target table are dependent on the source table,
* often used to indicate that records should be removed if the owning record in
* the source table is deleted.
*
* @var boolean
*/
protected $_dependent = false;
/**
* Whether or not cascaded deletes should also fire callbacks.
*
* @var string
*/
protected $_cascadeCallbacks = false;
/**
* Source table instance
*
* @var Cake\ORM\Table
*/
protected $_sourceTable;
/**
* Target table instance
*
* @var Cake\ORM\Table
*/
protected $_targetTable;
/**
* The type of join to be used when adding the association to a query
*
* @var string
*/
protected $_joinType = 'LEFT';
/**
* The property name that should be filled with data from the target table
* in the source table record.
*
* @var string
*/
protected $_propertyName;
/**
* The strategy name to be used to fetch associated records. Some association
* types might not implement but one strategy to fetch records.
*
* @var string
*/
protected $_strategy = self::STRATEGY_JOIN;
/**
* Constructor. Subclasses can override _options function to get the original
* list of passed options if expecting any other special key
*
* @param string $name The name given to the association
* @param array $options A list of properties to be set on this object
* @return void
*/
public function __construct($name, array $options = []) {
$defaults = [
'className',
'foreignKey',
'conditions',
'dependent',
'cascadeCallbacks',
'sourceTable',
'targetTable',
'joinType',
'propertyName'
];
foreach ($defaults as $property) {
if (isset($options[$property])) {
$this->{'_' . $property} = $options[$property];
}
}
$this->_name = $name;
$this->_options($options);
if (!empty($options['strategy'])) {
$this->strategy($options['strategy']);
}
}
/**
* Sets the name for this association. If no argument is passed then the current
* configured name will be returned
*
* @param string $name Name to be assigned
* @return string
*/
public function name($name = null) {
if ($name !== null) {
$this->_name = $name;
}
return $this->_name;
}
/**
* Sets the table instance for the source side of the association. If no arguments
* are passed, the current configured table instance is returned
*
* @param Cake\ORM\Table $table the instance to be assigned as source side
* @return Cake\ORM\Table
*/
public function source(Table $table = null) {
if ($table === null) {
return $this->_sourceTable;
}
return $this->_sourceTable = $table;
}
/**
* Sets the table instance for the target side of the association. If no arguments
* are passed, the current configured table instance is returned
*
* @param Cake\ORM\Table $table the instance to be assigned as target side
* @return Cake\ORM\Table
*/
public function target(Table $table = null) {
if ($table === null && $this->_targetTable) {
return $this->_targetTable;
}
if ($table !== null) {
return $this->_targetTable = $table;
}
if ($table === null) {
$config = [];
if (!TableRegistry::exists($this->_name)) {
$config = ['className' => $this->_className];
}
$this->_targetTable = TableRegistry::get($this->_name, $config);
}
return $this->_targetTable;
}
/**
* Sets a list of conditions to be always included when fetching records from
* the target association. If no parameters are passed the current list is returned
*
* @param array $conditions list of conditions to be used
* @see Cake\Database\Query::where() for examples on the format of the array
* @return array
*/
public function conditions($conditions = null) {
if ($conditions !== null) {
$this->_conditions = $conditions;
}
return $this->_conditions;
}
/**
* Sets the name of the field representing the foreign key to the target table.
* If no parameters are passed the current field is returned
*
* @param string $key the key to be used to link both tables together
* @return string|array
*/
public function foreignKey($key = null) {
if ($key !== null) {
$this->_foreignKey = $key;
}
return $this->_foreignKey;
}
/**
* Sets whether the records on the target table are dependent on the source table.
*
* This is primarily used to indicate that records should be removed if the owning record in
* the source table is deleted.
*
* If no parameters are passed the current setting is returned.
*
* @param boolean $dependent
* @return boolean
*/
public function dependent($dependent = null) {
if ($dependent !== null) {
$this->_dependent = $dependent;
}
return $this->_dependent;
}
/**
* Whether this association can be expressed directly in a query join
*
* @param array $options custom options key that could alter the return value
* @return boolean
*/
public function canBeJoined($options = []) {
return $this->_canBeJoined;
}
/**
* Sets the type of join to be used when adding the association to a query.
* If no arguments are passed, the currently configured type is returned.
*
* @param string $type the join type to be used (e.g. INNER)
* @return string
*/
public function joinType($type = null) {
if ($type === null) {
return $this->_joinType;
}
return $this->_joinType = $type;
}
/**
* Sets the property name that should be filled with data from the target table
* in the source table record.
* If no arguments are passed, the currently configured type is returned.
*
* @param string $name
* @return string
*/
public function property($name = null) {
if ($name !== null) {
$this->_propertyName = $name;
}
if ($name === null && !$this->_propertyName) {
list($plugin, $name) = pluginSplit($this->_name);
$this->_propertyName = Inflector::underscore($name);
}
return $this->_propertyName;
}
/**
* Sets the strategy name to be used to fetch associated records. Keep in mind
* that some association types might not implement but a default strategy,
* rendering any changes to this setting void.
* If no arguments are passed, the currently configured strategy is returned.
*
* @param string $name
* @return string
* @throws \InvalidArgumentException When an invalid strategy is provided.
*/
public function strategy($name = null) {
if ($name !== null) {
$valid = [self::STRATEGY_JOIN, self::STRATEGY_SELECT, self::STRATEGY_SUBQUERY];
if (!in_array($name, $valid)) {
throw new \InvalidArgumentException(
sprintf('Invalid strategy "%s" was provided', $name)
);
}
$this->_strategy = $name;
}
return $this->_strategy;
}
/**
* Override this function to initialize any concrete association class, it will
* get passed the original list of options used in the constructor
*
* @param array $options List of options used for initialization
* @return void
*/
protected function _options(array $options) {
}
/**
* Alters a Query object to include the associated target table data in the final
* result
*
* The options array accept the following keys:
*
* - includeFields: Whether to include target model fields in the result or not
* - foreignKey: The name of the field to use as foreign key, if false none
* will be used
* - conditions: array with a list of conditions to filter the join with, this
* will be merged with any conditions originally configured for this association
* - fields: a list of fields in the target table to include in the result
* - type: The type of join to be used (e.g. INNER)
*
* @param Query $query the query to be altered to include the target table data
* @param array $options Any extra options or overrides to be taken in account
* @return void
*/
public function attachTo(Query $query, array $options = []) {
$target = $this->target();
$options += [
'includeFields' => true,
'foreignKey' => $this->foreignKey(),
'conditions' => [],
'fields' => [],
'type' => $this->joinType(),
'table' => $target->table()
];
$options['conditions'] = array_merge($this->conditions(), $options['conditions']);
if (!empty($options['foreignKey'])) {
$joinCondition = $this->_joinCondition($options);
if ($joinCondition) {
$options['conditions'][] = $joinCondition;
}
}
$options['conditions'] = $query->newExpr()->add($options['conditions']);
$dummy = $target->query();
if (!empty($options['queryBuilder'])) {
$dummy = $options['queryBuilder']($dummy);
}
$this->_dispatchBeforeFind($dummy);
$joinOptions = ['table' => 1, 'conditions' => 1, 'type' => 1];
$options['conditions']->add($dummy->clause('where') ?: []);
$query->join([$target->alias() => array_intersect_key($options, $joinOptions)]);
$this->_appendFields($query, $dummy, $options);
$this->_formatAssociationResults($query, $dummy);
$this->_bindNewAssociations($query, $dummy, $options);
}
/**
* Correctly nests a result row associated values into the correct array keys inside the
* source results.
*
* @param array $result
* @return array
*/
public function transformRow($row) {
$sourceAlias = $this->source()->alias();
$targetAlias = $this->target()->alias();
if (isset($row[$sourceAlias])) {
$row[$sourceAlias][$this->property()] = $row[$targetAlias];
}
return $row;
}
/**
* Get the relationship type.
*
* @return string Constant of either ONE_TO_ONE, MANY_TO_ONE, or MANY_TO_MANY.
*/
public function type() {
return self::ONE_TO_ONE;
}
/**
* Proxies the finding operation to the target table's find method
* and modifies the query accordingly based of this association
* configuration
*
* @param string|array $type the type of query to perform, if an array is passed,
* it will be interpreted as the `$options` parameter
* @param array $options
* @see \Cake\ORM\Table::find()
* @return \Cake\ORM\Query
*/
public function find($type = 'all', $options = []) {
return $this->target()
->find($type, $options)
->where($this->conditions());
}
/**
* Triggers beforeFind on the target table for the query this association is
* attaching to
*
* @param \Cake\ORM\Query $query the query this association is attaching itself to
* @return void
*/
protected function _dispatchBeforeFind($query) {
$table = $this->target();
$options = $query->getOptions();
$event = new Event('Model.beforeFind', $table, [$query, $options, false]);
$table->getEventManager()->dispatch($event);
}
protected function _appendFields($query, $surrogate, $options) {
$options['fields'] = $surrogate->clause('select') ?: $options['fields'];
$target = $this->_targetTable;
if (empty($options['fields'])) {
$f = isset($options['fields']) ? $options['fields'] : null;
if ($options['includeFields'] && ($f === null || $f !== false)) {
$options['fields'] = $target->schema()->columns();
}
}
if (!empty($options['fields'])) {
$query->select($query->aliasFields($options['fields'], $target->alias()));
}
}
protected function _formatAssociationResults($query, $surrogate) {
$formatters = $surrogate->formatResults();
if (!$formatters) {
return;
}
$query->formatResults(function($results) use ($formatters) {
$property = $this->property();
$extracted = $results->extract($property)->compile();
foreach ($formatters as $callable) {
$extracted = new ResultSetDecorator($callable($extracted));
}
return $results->insert($property, $extracted);
});
}
protected function _bindNewAssociations($query, $surrogate, $options) {
$contain = $surrogate->contain();
$target = $this->_targetTable;
if (!$contain) {
return;
}
$loader = $surrogate->eagerLoader();
$loader->attachAssociations($query, $target, $options['includeFields']);
$newBinds = [];
foreach ($contain as $alias => $value) {
$newBinds[$options['path'] . '.' . $alias] = $value;
}
$query->contain($newBinds);
}
/**
* Returns a single or multiple condition(s) to be appended to the generated join
* clause for getting the results on the target table. If false is returned then
* it will not attach any new conditions to the join clause
*
* @param array $options list of options passed to attachTo method
* @return string|array|boolean
*/
protected abstract function _joinCondition(array $options);
/**
* Handles cascading a delete from an associated model.
*
* Each implementing class should handle the cascaded delete as
* required.
*
* @param Cake\ORM\Entity $entity The entity that started the cascaded delete.
* @param array $options The options for the original delete.
* @return boolean Success
*/
public abstract function cascadeDelete(Entity $entity, $options = []);
/**
* Returns whether or not the passed table is the owning side for this
* association. This means that rows in the 'target' table would miss important
* or required information if the row in 'source' did not exist.
*
* @param \Cake\ORM\Table $side The potential Table with ownership
* @return boolean
*/
public abstract function isOwningSide(Table $side);
/**
* Proxies the saving operation for an entity to the target table
*
* @param \Cake\ORM\Entity $entity the data to be saved
* @param array|\ArrayObject $options
* @return boolean|Entity false if $entity could not be saved, otherwise it returns
* the saved entity
* @see Table::save()
*/
public abstract function save(Entity $entity, $options = []);
}