The properties being copies are the ones to be used by query builders.
|
public static create ( |
||
| $from | the source query object | |
| 리턴 | the new Query object | |
/**
* @inheritdoc
*/
public function prepare($builder)
{
// NOTE: because the same ActiveQuery may be used to build different SQL statements
// (e.g. by ActiveDataProvider, one for count query, the other for row data query,
// it is important to make sure the same ActiveQuery can be used to build SQL statements
// multiple times.
if (!empty($this->joinWith)) {
$this->buildJoinWith();
$this->joinWith = null;
// clean it up to avoid issue https://github.com/yiisoft/yii2/issues/2687
}
if (empty($this->from)) {
/* @var $modelClass ActiveRecord */
$modelClass = $this->modelClass;
$tableName = $modelClass::tableName();
$this->from = [$tableName];
}
if (empty($this->select) && !empty($this->join)) {
list(, $alias) = $this->getQueryTableName($this);
$this->select = ["{$alias}.*"];
}
if ($this->primaryModel === null) {
// eager loading
$query = Query::create($this);
} else {
// lazy loading of a relation
$where = $this->where;
if ($this->via instanceof self) {
// via junction table
$viaModels = $this->via->findJunctionRows([$this->primaryModel]);
$this->filterByModels($viaModels);
} elseif (is_array($this->via)) {
// via relation
/* @var $viaQuery ActiveQuery */
list($viaName, $viaQuery) = $this->via;
if ($viaQuery->multiple) {
$viaModels = $viaQuery->all();
$this->primaryModel->populateRelation($viaName, $viaModels);
} else {
$model = $viaQuery->one();
$this->primaryModel->populateRelation($viaName, $model);
$viaModels = $model === null ? [] : [$model];
}
$this->filterByModels($viaModels);
} else {
$this->filterByModels([$this->primaryModel]);
}
$this->_viaModels = !empty($viaModels) ? $viaModels : [];
$query = Query::create($this);
$this->where = $where;
}
if (!empty($this->on)) {
$query->andWhere($this->on);
}
return $query;
}
public function relations($model, $attribute)
{
$relation = $model->fileRelation($attribute);
$handlerRelationQuery = $model->fileOption($attribute, 'relationQuery');
$query = null;
if ($handlerRelationQuery) {
$query = Query::create($handlerRelationQuery($model->find()));
}
$query = $query ?: new Query();
return $query->from($relation->via->from[0])->andWhere([key($relation->via->link) => $model->getPrimaryKey()])->indexBy(current($relation->link))->all();
}