c9ade62536
git-svn-id: file:///svn-source/pmgr/branches/reconcile_entry_to_receipt_20090629@187 97e9348a-65ac-dc4b-aefc-98561f571b83
406 lines
15 KiB
PHP
406 lines
15 KiB
PHP
<?php
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/*
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* LinkableBehavior
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* Light-weight approach for data mining on deep relations between models.
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* Join tables based on model relations to easily enable right to left find operations.
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*
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* Can be used as a alternative to the ContainableBehavior:
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* - On data fetching only in right to left operations,
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* wich means that in "one to many" relations (hasMany, hasAndBelongsToMany)
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* should only be used from the "many to one" tables. i.e:
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* To fetch all Users assigneds to a Project with ProjectAssignment,
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* $Project->find('all', array('link' => 'User', 'conditions' => 'project_id = 1'))
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* - Won't produce the desired result as data came from users table will be lost.
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* $User->find('all', array('link' => 'Project', 'conditions' => 'project_id = 1'))
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* - Will fetch all users related to the specified project in one query
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*
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* - On data mining as a much lighter approach - can reduce 300+ query find operations
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* in one single query with joins; "or your money back!" ;-)
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*
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* - Has the 'fields' param enabled to make it easy to replace Containable usage,
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* only change the 'contain' param to 'link'.
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*
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* Linkable Behavior. Taking it easy in your DB.
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* RafaelBandeira <rafaelbandeira3(at)gmail(dot)com>
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*
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* Licensed under The MIT License
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* Redistributions of files must retain the above copyright notice.
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*
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* @version 1.0;
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*/
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/**********************************************************************
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* NOTE TO <AP> 20090615:
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* This structure should be linkable (it was my test case).
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$entry = $this->LedgerEntry->find
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('first',
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array('link' => array('DebitLedger' =>
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array(
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'fields' => array('id'),
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'alias' => 'MyDebitLedger',
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'Account' =>
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array(
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'fields' => array('id'),
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'alias' => 'MyDebitAccount'),
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),
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'MyCreditLedger' =>
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array(
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'fields' => array('id'),
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'class' => 'CreditLedger',
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'MyCreditAccount' =>
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array(
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'fields' => array('id'),
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'class' => 'Account'),
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),
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'MyOtherLedger' =>
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array(
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'fields' => array('id'),
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'class' => 'Ledger',
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'alias' => 'AliasToMyOtherLedger',
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'Account' =>
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array(
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'fields' => array('id'),
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'alias' => 'AliasToMyOtherAccount'),
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),
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),
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'conditions' => array('LedgerEntry.id' => $id),
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));
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**********************************************************************/
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class LinkableBehavior extends ModelBehavior {
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protected $_key = 'link';
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protected $_options = array(
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'type' => true, 'table' => true, 'alias' => true, 'joins' => true,
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'conditions' => true, 'fields' => true, 'reference' => true,
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'class' => true, 'defaults' => true, 'linkalias' => true,
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);
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protected $_defaults = array('type' => 'LEFT');
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function pr($lev, $mixed) {
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if ($lev >= 5)
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return;
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pr($mixed);
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return;
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$trace = debug_backtrace(false);
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//array_shift($trace);
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$calls = array();
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foreach ($trace AS $call) {
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$call = array_intersect_key($call,
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array('file'=>1,
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'line'=>1,
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//'class'=>1,
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'function'=>1,
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));
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$calls[] = implode("; ", $call);
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}
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pr(array('debug' => $mixed, 'stack' => $calls));
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}
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/*
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* This is a function for made recursive str_replaces in an array
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* NOTE: The palacement of this function is terrible, but I don't
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* know if I really want to go down this path or not.
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*/
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function recursive_array_replace($find, $replace, &$data) {
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if (!isset($data))
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return;
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if (is_array($data)) {
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foreach ($data as $key => $value) {
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if (is_array($value)) {
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$this->recursive_array_replace($find, $replace, $data[$key]);
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} else {
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$data[$key] = str_replace($find, $replace, $value);
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}
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}
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} else {
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$data = str_replace($find, $replace, $data);
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}
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}
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public function beforeFind(&$Model, $query) {
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$this->pr(10,
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array('function' => 'Linkable::beforeFind',
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'args' => array('Model->alias' => '$Model->alias') + compact('query'),
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));
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if (isset($query[$this->_key])) {
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$optionsDefaults = $this->_defaults + array('reference' =>
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array('class' => $Model->alias,
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'alias' => $Model->alias),
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$this->_key => array());
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$optionsKeys = $this->_options + array($this->_key => true);
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if (!isset($query['fields']) || $query['fields'] === true) {
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//$query['fields'] = array_keys($Model->_schema);
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$query['fields'] = $Model->getDataSource()->fields($Model);
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} elseif (!is_array($query['fields'])) {
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$query['fields'] = array($query['fields']);
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}
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$query = am(array('joins' => array()), $query, array('recursive' => -1));
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$iterators[] = $query[$this->_key];
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$cont = 0;
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do {
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$iterator = $iterators[$cont];
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$defaults = $optionsDefaults;
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if (isset($iterator['defaults'])) {
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$defaults = array_merge($defaults, $iterator['defaults']);
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unset($iterator['defaults']);
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}
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$iterations = Set::normalize($iterator);
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$this->pr(25,
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array('checkpoint' => 'Iterations',
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compact('iterations'),
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));
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foreach ($iterations as $alias => $options) {
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if (is_null($options)) {
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$options = array();
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}
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$options = am($defaults, compact('alias'), $options);
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if (empty($options['alias'])) {
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throw new InvalidArgumentException(sprintf('%s::%s must receive aliased links', get_class($this), __FUNCTION__));
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}
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if (empty($options['class']))
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$options['class'] = $alias;
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if (!isset($options['conditions']))
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$options['conditions'] = array();
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elseif (!is_array($options['conditions']))
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$options['conditions'] = array($options['conditions']);
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$this->pr(20,
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array('checkpoint' => 'Begin Model Work',
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compact('alias', 'options'),
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));
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$modelClass = $options['class'];
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$modelAlias = $options['alias'];
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$referenceClass = $options['reference']['class'];
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$referenceAlias = $options['reference']['alias'];
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$_Model =& ClassRegistry::init($modelClass); // the incoming model to be linked in query
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$Reference =& ClassRegistry::init($referenceClass); // the already in query model that links to $_Model
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$this->pr(12,
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array('checkpoint' => 'Aliases Established',
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'Model' => ($modelAlias .' : '. $modelClass .
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' ('. $_Model->alias .' : '. $_Model->name .')'),
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'Reference' => ($referenceAlias .' : '. $referenceClass .
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' ('. $Reference->alias .' : '. $Reference->name .')'),
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));
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$db =& $_Model->getDataSource();
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$associatedThroughReference = 0;
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$association = null;
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// Figure out how these two models are related, creating
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// a relationship if one doesn't otherwise already exists.
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if (($associations = $Reference->getAssociated()) &&
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isset($associations[$_Model->alias])) {
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$this->pr(12, array('checkpoint' => "Reference defines association to _Model"));
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$associatedThroughReference = 1;
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$type = $associations[$_Model->alias];
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$association = $Reference->{$type}[$_Model->alias];
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}
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elseif (($associations = $_Model->getAssociated()) &&
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isset($associations[$Reference->alias])) {
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$this->pr(12, array('checkpoint' => "_Model defines association to Reference"));
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$type = $associations[$Reference->alias];
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$association = $_Model->{$type}[$Reference->alias];
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}
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else {
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// No relationship... make our best effort to create one.
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$this->pr(12, array('checkpoint' => "No assocation between _Model and Reference"));
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$type = 'belongsTo';
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$_Model->bind($Reference->alias);
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// Grab the association now, since we'll unbind in a moment.
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$association = $_Model->{$type}[$Reference->alias];
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$_Model->unbindModel(array('belongsTo' => array($Reference->alias)));
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}
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// Determine which model holds the foreign key
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if (($type === 'hasMany' || $type === 'hasOne') ^ $associatedThroughReference) {
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$primaryAlias = $referenceAlias;
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$foreignAlias = $modelAlias;
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$primaryModel = $Reference;
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$foreignModel = $_Model;
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} else {
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$primaryAlias = $modelAlias;
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$foreignAlias = $referenceAlias;
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$primaryModel = $_Model;
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$foreignModel = $Reference;
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}
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if ($associatedThroughReference)
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$associationAlias = $referenceAlias;
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else
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$associationAlias = $modelAlias;
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$this->recursive_array_replace("%{MODEL_ALIAS}",
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$associationAlias,
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$association['conditions']);
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$this->pr(15,
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array('checkpoint' => 'Models Established - Check Associations',
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'primaryModel' => $primaryAlias .' : '. $primaryModel->name,
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'foreignModel' => $foreignAlias .' : '. $foreignModel->name,
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compact('type', 'association'),
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));
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if ($type === 'hasAndBelongsToMany') {
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if (isset($association['with']))
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$linkClass = $association['with'];
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else
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$linkClass = Inflector::classify($association['joinTable']);
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$Link =& $_Model->{$linkClass};
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if (isset($options['linkalias']))
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$linkAlias = $options['linkalias'];
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else
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$linkAlias = $Link->alias;
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$this->pr(17,
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array('checkpoint' => 'Linking HABTM',
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compact('linkClass', 'linkAlias'),
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));
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// Get the foreign key fields (for the link table) directly from
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// the defined model associations, if they exists. This is the
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// users direct specification, and therefore definitive if present.
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$modelLink = $Link->escapeField($association['foreignKey'], $linkAlias);
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$referenceLink = $Link->escapeField($association['associationForeignKey'], $linkAlias);
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// If we haven't figured out the foreign keys, see if there is a
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// model for the link table, and if it has the appropriate
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// associations with the two tables we're trying to join.
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if (empty($modelLink) && isset($Link->belongsTo[$_Model->alias]))
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$modelLink = $Link->escapeField($Link->belongsTo[$_Model->alias]['foreignKey'], $linkAlias);
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if (empty($referenceLink) && isset($Link->belongsTo[$Reference->alias]))
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$referenceLink = $Link->escapeField($Link->belongsTo[$Reference->alias]['foreignKey'], $linkAlias);
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// We're running quite thin here. None of the models spell
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// out the appropriate linkages. We'll have to SWAG it.
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if (empty($modelLink))
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$modelLink = $Link->escapeField(Inflector::underscore($_Model->alias) . '_id', $linkAlias);
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if (empty($referenceLink))
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$referenceLink = $Link->escapeField(Inflector::underscore($Reference->alias) . '_id', $linkAlias);
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// Get the primary key from the tables we're joining.
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$referenceKey = $Reference->escapeField(null, $referenceAlias);
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$modelKey = $_Model->escapeField(null, $modelAlias);
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// Join the linkage table to our model. We'll use an inner join,
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// as the whole purpose of the linkage table is to make this
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// connection. As we are embedding this join, the INNER will not
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// cause any problem with the overall query, should the user not
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// be concerned with whether or not the join has any results.
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// They control that with the 'type' parameter which will be at
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// the top level join.
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$options['joins'][] = array('type' => 'INNER',
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'alias' => $modelAlias,
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'conditions' => "{$modelKey} = {$modelLink}",
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'table' => $db->fullTableName($_Model, true));
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// Now for the top level join. This will be added into the list
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// of joins down below, outside of the HABTM specific code.
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$options['class'] = $linkClass;
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$options['alias'] = $linkAlias;
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$options['table'] = $Link->getDataSource()->fullTableName($Link);
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$options['conditions'][] = "{$referenceLink} = {$referenceKey}";
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}
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elseif (isset($association['foreignKey']) && $association['foreignKey']) {
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$foreignKey = $primaryModel->escapeField($association['foreignKey'], $primaryAlias);
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$primaryKey = $foreignModel->escapeField($foreignModel->primaryKey, $foreignAlias);
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$this->pr(17,
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array('checkpoint' => 'Linking due to foreignKey',
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compact('foreignKey', 'primaryKey'),
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));
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// Only differentiating to help show the logical flow.
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// Either way works and this test can be tossed out
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if (($type === 'hasMany' || $type === 'hasOne') ^ $associatedThroughReference)
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$options['conditions'][] = "{$primaryKey} = {$foreignKey}";
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else
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$options['conditions'][] = "{$foreignKey} = {$primaryKey}";
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}
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else {
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$this->pr(17,
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array('checkpoint' => 'Linking with no logic (expecting user defined)',
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));
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// No Foreign Key... nothing we can do.
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}
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$this->pr(19,
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array('checkpoint' => 'Conditions',
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array('options[conditions]' => $options['conditions'],
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'association[conditions]' => $association['conditions'],
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),
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));
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// The user may have specified conditions directly in the model
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// for this join. Make sure to adhere to those conditions.
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if (isset($association['conditions']) && is_array($association['conditions']))
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$options['conditions'] = array_merge($options['conditions'], $association['conditions']);
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elseif (!empty($association['conditions']))
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$options['conditions'][] = $association['conditions'];
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$this->pr(19,
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array('checkpoint' => 'Conditions2',
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array('options[conditions]' => $options['conditions'],
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),
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));
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if (empty($options['table'])) {
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$options['table'] = $db->fullTableName($_Model, true);
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}
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if (!isset($options['fields']) || !is_array($options['fields']))
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$options['fields'] = $db->fields($_Model, $modelAlias);
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elseif (!empty($options['fields']))
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$options['fields'] = $db->fields($_Model, $modelAlias, $options['fields']);
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$query['fields'] = array_merge($query['fields'], $options['fields'],
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(empty($association['fields'])
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? array() : $db->fields($_Model, $modelAlias, $association['fields'])));
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$options[$this->_key] = am($options[$this->_key], array_diff_key($options, $optionsKeys));
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$options = array_intersect_key($options, $optionsKeys);
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if (!empty($options[$this->_key])) {
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$iterators[] = $options[$this->_key] +
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array('defaults' =>
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array_merge($defaults,
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array('reference' =>
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array('class' => $modelClass,
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'alias' => $modelAlias))));
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}
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$query['joins'][] = array_intersect_key($options, array('type' => true, 'alias' => true, 'table' => true, 'joins' => true, 'conditions' => true));
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$this->pr(19,
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array('checkpoint' => 'Model Join Complete',
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compact('options', 'modelClass', 'modelAlias', 'query'),
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));
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}
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++$cont;
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$notDone = isset($iterators[$cont]);
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} while ($notDone);
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}
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$this->pr(20,
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array('function' => 'Linkable::beforeFind',
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'return' => compact('query'),
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));
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return $query;
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}
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} |