在 CakePHP 中检索 HABTM、HasMany...等数据比 -1 递归手动连接更好？

Question

我有一个事件数据库。我创建了一个模型函数来根据城市、类型、子类型、开始和结束日期检索事件。

它（大部分情况下）都在工作，但天哪，它是一段新奇的代码。有一个更好的方法吗？ （代码很多，但不难理解我在做什么）：

我的一些联想：

Event belongsTo Restaurant
Event belongsTo Venue
Restaurant belongsTo City
Venue belongsTo City

Event hasAndBelongsToMany EventType
Event hasAndBelongsToMany EventSubType

Event hasMany Schedule
Schedule hasMany Date

(and of course their belongsTo/hasMany counterparts are set up too)

---

我的“getEvents”函数（在事件模型中）：

function getEvents($opts) {
    //$opts = limit, start, end, fields, types, subtypes, subsubtypes, cities

    //dates
    $qOpts['start'] = date('Y-m-d') . ' 00:00:00';
    if(isset($opts['start'])) $qOpts['start'] = $opts['start'];

    $qOpts['end'] = date('Y-m-d') . ' 23:59:59';
    if(isset($opts['end'])) $qOpts['end'] = $opts['end'];

    //limit
    if(isset($opts['limit'])) $qOpts['limit'] = $opts['limit'];

    //fields
    $qOpts['fields'] = array('Event.id', 'Event.name', 'Event.slug', 'City.name', 'Date.start');    
    if(isset($opts['fields'])) $qOpts['fields'] = $opts['fields'];

    //joins
    $qOpts['joins'] = array(
        array('table' => 'schedules',
            'alias' => 'Schedule',
            'type' => 'LEFT',
            'conditions' => array(
                'Event.id = Schedule.event_id',
            )
        ),
        array('table' => 'dates',
            'alias' => 'Date', 
            'type' => 'LEFT',
            'order' => 'Date.start ASC',
            'conditions' => array(
                'Date.schedule_id = Schedule.id',
            ),
        ),
        array('table' => 'venues',
            'alias' => 'Venue',
            'type' => 'LEFT',
            'conditions' => array(
                'Event.venue_id = Venue.id',
            )
        ),
        array('table' => 'restaurants',
            'alias' => 'Restaurant',
            'type' => 'LEFT',
            'conditions' => array(
                'Event.restaurant_id = Restaurant.id',
            )
        ),
        array('table' => 'cities',
            'alias' => 'City',
            'type' => 'LEFT',
            'conditions' => array(
                'OR' => array(
                    'Venue.city_id = City.id',
                    'Restaurant.city_id = City.id',
                ),
            )
        ),
        array('table' => 'event_types_events',
            'alias' => 'EventTypesEvent',
            'type' => 'LEFT',
            'conditions' => array(
                'EventTypesEvent.event_id = Event.id',
            )
        ),
        array('table' => 'event_sub_types_events',
            'alias' => 'EventSubTypesEvent',
            'type' => 'LEFT',
            'conditions' => array(
                'EventSubTypesEvent.event_id = Event.id',
            )
        ),
        array('table' => 'event_types',
            'alias' => 'EventType',
            'type' => 'LEFT',
            'conditions' => array(
                'EventTypesEvent.event_type_id = EventType.id',
            )
        ),
        array('table' => 'event_sub_types',
            'alias' => 'EventSubType',
            'type' => 'LEFT',
            'conditions' => array(
                'EventSubTypesEvent.event_sub_type_id = EventSubType.id',
            )
        ),
    );

    //date conditions
    $qOpts['conditions'] = array(
        "Date.start >=" => $qOpts['start'],
        "Date.start <=" => $qOpts['end'],
    );

    //cities conditions
    if(isset($opts['cities'])) {
        if(is_array($opts['cities'])) {
            $cityConditions['OR'] = array();
            foreach($opts['cities'] as $city_id) {
                array_push($cityConditions['OR'], array('City.id'=>$city_id));
            }
            array_push($qOpts['conditions'], $cityConditions);
        }
    }

    //event types conditions
    if(isset($opts['event_types'])) {
        if(is_array($opts['event_types'])) {
            $eventTypeConditions['OR'] = array();
            foreach($opts['event_types'] as $event_type_id) {
                array_push($eventTypeConditions['OR'], array('EventType.id'=>$event_type_id));
            }
            array_push($qOpts['conditions'], $eventTypeConditions);
        }
    }

    //event sub types conditions
    if(isset($opts['event_sub_types'])) {
        if(is_array($opts['event_sub_types'])) {
            $eventSubTypeConditions['OR'] = array();
            foreach($opts['event_sub_types'] as $event_sub_type_id) {
                array_push($eventSubTypeConditions['OR'], array('EventSubType.id'=>$event_sub_type_id));
            }
            array_push($qOpts['conditions'], $eventSubTypeConditions);
        }
    }

    $this->recursive = -1;
    $data = $this->find('all', $qOpts);
    return $data;
}

加分：我在StackOverflow (here) 上也有一个关于此功能的问题 - 试图弄清楚如何让它返回多个日期，而不是每个事件只返回一个日期。 p>

Answer 1

只需正确设置您的关联并执行正常（递归）find()。如果您想对检索到的关联数据进行更多控制，请使用ContainableBehavior。

如果您对某个关联模型有条件要求您将其他表加入到主查询中，这是一个不同的主题，有很多方法可以解决这个问题（搜索 SO 或提出特定问题）。为此，手动连接可能是合适的。不过，您不需要手动连接表来检索关联数据。