340 lines
14 KiB
PHP
340 lines
14 KiB
PHP
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<?php
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/**
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* @link http://www.yiiframework.com/
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* @copyright Copyright (c) 2008 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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namespace yii\validators;
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use Yii;
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use yii\base\Model;
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use yii\db\ActiveQuery;
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use yii\db\ActiveQueryInterface;
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use yii\db\ActiveRecord;
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use yii\db\ActiveRecordInterface;
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use yii\helpers\Inflector;
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/**
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* UniqueValidator validates that the attribute value is unique in the specified database table.
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*
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* UniqueValidator checks if the value being validated is unique in the table column specified by
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* the ActiveRecord class [[targetClass]] and the attribute [[targetAttribute]].
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*
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* The following are examples of validation rules using this validator:
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*
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* ```php
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* // a1 needs to be unique
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* ['a1', 'unique']
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* // a1 needs to be unique, but column a2 will be used to check the uniqueness of the a1 value
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* ['a1', 'unique', 'targetAttribute' => 'a2']
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* // a1 and a2 need to be unique together, and they both will receive error message
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* [['a1', 'a2'], 'unique', 'targetAttribute' => ['a1', 'a2']]
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* // a1 and a2 need to be unique together, only a1 will receive error message
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* ['a1', 'unique', 'targetAttribute' => ['a1', 'a2']]
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* // a1 needs to be unique by checking the uniqueness of both a2 and a3 (using a1 value)
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* ['a1', 'unique', 'targetAttribute' => ['a2', 'a1' => 'a3']]
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* ```
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @since 2.0
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*/
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class UniqueValidator extends Validator
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{
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/**
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* @var string the name of the ActiveRecord class that should be used to validate the uniqueness
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* of the current attribute value. If not set, it will use the ActiveRecord class of the attribute being validated.
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* @see targetAttribute
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*/
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public $targetClass;
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/**
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* @var string|array the name of the [[\yii\db\ActiveRecord|ActiveRecord]] attribute that should be used to
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* validate the uniqueness of the current attribute value. If not set, it will use the name
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* of the attribute currently being validated. You may use an array to validate the uniqueness
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* of multiple columns at the same time. The array values are the attributes that will be
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* used to validate the uniqueness, while the array keys are the attributes whose values are to be validated.
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*/
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public $targetAttribute;
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/**
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* @var string|array|\Closure additional filter to be applied to the DB query used to check the uniqueness of the attribute value.
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* This can be a string or an array representing the additional query condition (refer to [[\yii\db\Query::where()]]
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* on the format of query condition), or an anonymous function with the signature `function ($query)`, where `$query`
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* is the [[\yii\db\Query|Query]] object that you can modify in the function.
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*/
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public $filter;
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/**
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* @var string the user-defined error message.
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*
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* When validating single attribute, it may contain
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* the following placeholders which will be replaced accordingly by the validator:
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*
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* - `{attribute}`: the label of the attribute being validated
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* - `{value}`: the value of the attribute being validated
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*
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* When validating mutliple attributes, it may contain the following placeholders:
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*
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* - `{attributes}`: the labels of the attributes being validated.
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* - `{values}`: the values of the attributes being validated.
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*/
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public $message;
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/**
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* @var string
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* @since 2.0.9
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* @deprecated since version 2.0.10, to be removed in 2.1. Use [[message]] property
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* to setup custom message for multiple target attributes.
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*/
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public $comboNotUnique;
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/**
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* @var string and|or define how target attributes are related
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* @since 2.0.11
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*/
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public $targetAttributeJunction = 'and';
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/**
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* @var bool whether this validator is forced to always use master DB
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* @since 2.0.14
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*/
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public $forceMasterDb = true;
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/**
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* {@inheritdoc}
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*/
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public function init()
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{
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parent::init();
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if ($this->message !== null) {
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return;
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}
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if (is_array($this->targetAttribute) && count($this->targetAttribute) > 1) {
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// fallback for deprecated `comboNotUnique` property - use it as message if is set
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if ($this->comboNotUnique === null) {
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$this->message = Yii::t('yii', 'The combination {values} of {attributes} has already been taken.');
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} else {
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$this->message = $this->comboNotUnique;
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}
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} else {
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$this->message = Yii::t('yii', '{attribute} "{value}" has already been taken.');
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}
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}
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/**
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* {@inheritdoc}
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*/
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public function validateAttribute($model, $attribute)
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{
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/* @var $targetClass ActiveRecordInterface */
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$targetClass = $this->getTargetClass($model);
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$targetAttribute = $this->targetAttribute === null ? $attribute : $this->targetAttribute;
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$rawConditions = $this->prepareConditions($targetAttribute, $model, $attribute);
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$conditions = [$this->targetAttributeJunction === 'or' ? 'or' : 'and'];
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foreach ($rawConditions as $key => $value) {
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if (is_array($value)) {
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$this->addError($model, $attribute, Yii::t('yii', '{attribute} is invalid.'));
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return;
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}
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$conditions[] = [$key => $value];
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}
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$db = $targetClass::getDb();
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$modelExists = false;
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if ($this->forceMasterDb && method_exists($db, 'useMaster')) {
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$db->useMaster(function () use ($targetClass, $conditions, $model, &$modelExists) {
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$modelExists = $this->modelExists($targetClass, $conditions, $model);
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});
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} else {
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$modelExists = $this->modelExists($targetClass, $conditions, $model);
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}
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if ($modelExists) {
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if (is_array($targetAttribute) && count($targetAttribute) > 1) {
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$this->addComboNotUniqueError($model, $attribute);
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} else {
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$this->addError($model, $attribute, $this->message);
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}
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}
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}
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/**
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* @param Model $model the data model to be validated
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* @return string Target class name
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*/
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private function getTargetClass($model)
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{
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return $this->targetClass === null ? get_class($model) : $this->targetClass;
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}
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/**
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* Checks whether the $model exists in the database.
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*
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* @param string $targetClass the name of the ActiveRecord class that should be used to validate the uniqueness
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* of the current attribute value.
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* @param array $conditions conditions, compatible with [[\yii\db\Query::where()|Query::where()]] key-value format.
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* @param Model $model the data model to be validated
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*
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* @return bool whether the model already exists
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*/
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private function modelExists($targetClass, $conditions, $model)
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{
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/** @var ActiveRecordInterface|\yii\base\BaseObject $targetClass $query */
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$query = $this->prepareQuery($targetClass, $conditions);
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if (!$model instanceof ActiveRecordInterface || $model->getIsNewRecord() || $model->className() !== $targetClass::className()) {
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// if current $model isn't in the database yet then it's OK just to call exists()
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// also there's no need to run check based on primary keys, when $targetClass is not the same as $model's class
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$exists = $query->exists();
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} else {
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// if current $model is in the database already we can't use exists()
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if ($query instanceof \yii\db\ActiveQuery) {
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// only select primary key to optimize query
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$columnsCondition = array_flip($targetClass::primaryKey());
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$query->select(array_flip($this->applyTableAlias($query, $columnsCondition)));
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// any with relation can't be loaded because related fields are not selected
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$query->with = null;
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if (is_array($query->joinWith)) {
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// any joinWiths need to have eagerLoading turned off to prevent related fields being loaded
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foreach ($query->joinWith as &$joinWith) {
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// \yii\db\ActiveQuery::joinWith adds eagerLoading at key 1
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$joinWith[1] = false;
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}
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unset($joinWith);
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}
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}
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$models = $query->limit(2)->asArray()->all();
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$n = count($models);
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if ($n === 1) {
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// if there is one record, check if it is the currently validated model
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$dbModel = reset($models);
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$pks = $targetClass::primaryKey();
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$pk = [];
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foreach ($pks as $pkAttribute) {
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$pk[$pkAttribute] = $dbModel[$pkAttribute];
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}
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$exists = ($pk != $model->getOldPrimaryKey(true));
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} else {
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// if there is more than one record, the value is not unique
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$exists = $n > 1;
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}
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}
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return $exists;
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}
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/**
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* Prepares a query by applying filtering conditions defined in $conditions method property
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* and [[filter]] class property.
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*
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* @param ActiveRecordInterface $targetClass the name of the ActiveRecord class that should be used to validate
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* the uniqueness of the current attribute value.
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* @param array $conditions conditions, compatible with [[\yii\db\Query::where()|Query::where()]] key-value format
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*
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* @return ActiveQueryInterface|ActiveQuery
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*/
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private function prepareQuery($targetClass, $conditions)
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{
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$query = $targetClass::find();
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$query->andWhere($conditions);
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if ($this->filter instanceof \Closure) {
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call_user_func($this->filter, $query);
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} elseif ($this->filter !== null) {
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$query->andWhere($this->filter);
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}
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return $query;
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}
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/**
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* Processes attributes' relations described in $targetAttribute parameter into conditions, compatible with
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* [[\yii\db\Query::where()|Query::where()]] key-value format.
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*
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* @param string|array $targetAttribute the name of the [[\yii\db\ActiveRecord|ActiveRecord]] attribute that
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* should be used to validate the uniqueness of the current attribute value. You may use an array to validate
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* the uniqueness of multiple columns at the same time. The array values are the attributes that will be
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* used to validate the uniqueness, while the array keys are the attributes whose values are to be validated.
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* If the key and the value are the same, you can just specify the value.
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* @param Model $model the data model to be validated
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* @param string $attribute the name of the attribute to be validated in the $model
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*
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* @return array conditions, compatible with [[\yii\db\Query::where()|Query::where()]] key-value format.
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*/
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private function prepareConditions($targetAttribute, $model, $attribute)
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{
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if (is_array($targetAttribute)) {
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$conditions = [];
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foreach ($targetAttribute as $k => $v) {
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$conditions[$v] = is_int($k) ? $model->$v : $model->$k;
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}
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} else {
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$conditions = [$targetAttribute => $model->$attribute];
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}
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$targetModelClass = $this->getTargetClass($model);
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if (!is_subclass_of($targetModelClass, 'yii\db\ActiveRecord')) {
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return $conditions;
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}
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/** @var ActiveRecord $targetModelClass */
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return $this->applyTableAlias($targetModelClass::find(), $conditions);
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}
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/**
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* Builds and adds [[comboNotUnique]] error message to the specified model attribute.
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* @param \yii\base\Model $model the data model.
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* @param string $attribute the name of the attribute.
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*/
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private function addComboNotUniqueError($model, $attribute)
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{
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$attributeCombo = [];
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$valueCombo = [];
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foreach ($this->targetAttribute as $key => $value) {
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if (is_int($key)) {
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$attributeCombo[] = $model->getAttributeLabel($value);
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$valueCombo[] = '"' . $model->$value . '"';
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} else {
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$attributeCombo[] = $model->getAttributeLabel($key);
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$valueCombo[] = '"' . $model->$key . '"';
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}
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}
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$this->addError($model, $attribute, $this->message, [
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'attributes' => Inflector::sentence($attributeCombo),
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'values' => implode('-', $valueCombo),
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]);
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}
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/**
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* Returns conditions with alias.
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* @param ActiveQuery $query
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* @param array $conditions array of condition, keys to be modified
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* @param null|string $alias set empty string for no apply alias. Set null for apply primary table alias
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* @return array
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*/
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private function applyTableAlias($query, $conditions, $alias = null)
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{
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if ($alias === null) {
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$alias = array_keys($query->getTablesUsedInFrom())[0];
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}
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$prefixedConditions = [];
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foreach ($conditions as $columnName => $columnValue) {
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if (strpos($columnName, '(') === false) {
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$columnName = preg_replace('/^' . preg_quote($alias) . '\.(.*)$/', '$1', $columnName);
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if (strpos($columnName, '[[') === 0) {
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$prefixedColumn = "{$alias}.{$columnName}";
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} else {
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$prefixedColumn = "{$alias}.[[{$columnName}]]";
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}
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} else {
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// there is an expression, can't prefix it reliably
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$prefixedColumn = $columnName;
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}
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$prefixedConditions[$prefixedColumn] = $columnValue;
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}
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return $prefixedConditions;
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}
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}
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