<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\db;

/**
 * ActiveQueryInterface defines the common interface to be implemented by active record query classes.
 *
 * That are methods for either normal queries that return active records but also relational queries
 * in which the query represents a relation between two active record classes and will return related
 * records only.
 *
 * A class implementing this interface should also use [[ActiveQueryTrait]] and [[ActiveRelationTrait]].
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @author Carsten Brandt <mail@cebe.cc>
 * @since 2.0
 */
interface ActiveQueryInterface extends QueryInterface
{
	/**
	 * Sets the [[asArray]] property.
	 * @param boolean $value whether to return the query results in terms of arrays instead of Active Records.
	 * @return static the query object itself
	 */
	public function asArray($value = true);

	/**
	 * Sets the [[indexBy]] property.
	 * @param string|callable $column the name of the column by which the query results should be indexed by.
	 * This can also be a callable (e.g. anonymous function) that returns the index value based on the given
	 * row or model data. The signature of the callable should be:
	 *
	 * ~~~
	 * // $model is an AR instance when `asArray` is false,
	 * // or an array of column values when `asArray` is true.
	 * function ($model)
	 * {
	 *     // return the index value corresponding to $model
	 * }
	 * ~~~
	 *
	 * @return static the query object itself
	 */
	public function indexBy($column);

	/**
	 * Specifies the relations with which this query should be performed.
	 *
	 * The parameters to this method can be either one or multiple strings, or a single array
	 * of relation names and the optional callbacks to customize the relations.
	 *
	 * A relation name can refer to a relation defined in [[ActiveQueryTrait::modelClass|modelClass]]
	 * or a sub-relation that stands for a relation of a related record.
	 * For example, `orders.address` means the `address` relation defined
	 * in the model class corresponding to the `orders` relation.
	 *
	 * The followings are some usage examples:
	 *
	 * ~~~
	 * // find customers together with their orders and country
	 * Customer::find()->with('orders', 'country')->all();
	 * // find customers together with their orders and the orders' shipping address
	 * Customer::find()->with('orders.address')->all();
	 * // find customers together with their country and orders of status 1
	 * Customer::find()->with([
	 *     'orders' => function($query) {
	 *         $query->andWhere('status = 1');
	 *     },
	 *     'country',
	 * ])->all();
	 * ~~~
	 *
	 * @return static the query object itself
	 */
	public function with();

	/**
	 * Specifies the relation associated with the pivot table for use in relational query.
	 * @param string $relationName the relation name. This refers to a relation declared in the [[ActiveRelationTrait::primaryModel|primaryModel]] of the relation.
	 * @param callable $callable a PHP callback for customizing the relation associated with the pivot table.
	 * Its signature should be `function($query)`, where `$query` is the query to be customized.
	 * @return static the relation object itself.
	 */
	public function via($relationName, $callable = null);

	/**
	 * Finds the related records for the specified primary record.
	 * This method is invoked when a relation of an ActiveRecord is being accessed in a lazy fashion.
	 * @param string $name the relation name
	 * @param ActiveRecordInterface $model the primary model
	 * @return mixed the related record(s)
	 */
	public function findFor($name, $model);
}
