该查询有效，并返回我想要的结果，但是一旦转换为集合或试图对其进行“分页”，它将返回一个空结果。我尝试对简单的页面进行分页，DB::table('users')->paginate(5)[0]并且可以正常工作，因此我猜它并非来自分页本身。
代码
$photographers_available = Photographer::where('is_photographer', '=', '1')
->where(function($q)use($city_id)
{
$q->whereHas('studioAddress', function($q)use($city_id)
{
$q->where('city_id', '=', $city_id);
})
->orWhereHas('user', function($q)use($city_id) // TK could reduce to 'user.address' I think
{
$q->whereHas('address', function($q)use($city_id)
{
$q->where('city_id', '=', $city_id);
});
});
})
->whereHas('stypesPhotographer', function($q)use($stype)
{
$q->where('shooting_type_id', '=', $stype);
})
->whereHas('availabilities', function ($q) use ($selected_date_time)
{
$q->where('unavailable_start_date', '<', $selected_date_time)
->where('unavailable_end_date', '>', $selected_date_time);
}, '=', 0)
->whereHas('bookings', function($q)use($selected_date_time)
{
$q->where('booking_date', '=', $selected_date_time);
}, '=', 0)
->join('stypes_4_photographer', function($join)use($stype)
{
$join->on('photographer_id', '=', 'photographers.id')
->where('shooting_type_id', '=', $stype);
});
$photobla = $photographers_available->first();
echo '<pre>';print_r($photobla);
// RETURNS RESULTS CORRECTLY
$photoTEST = $photographers_available->get();
echo '<pre>';print_r($photoTEST);die();
// RETURNS $photoTEST as NULL.....
// WHY has $photographers_available BEEN EMPTIED?????
结果
// $photobla result
Photographer Object
(
[fillable:protected] => Array
(
[0] => id
[1] => is_photographer
[2] => service_description
[3] => radius_around_city_available
[4] => tax_nbr
[5] => user_id
[6] => average_score
)
[table:protected] => photographers
[touches:protected] => Array
(
[0] => stypesPhotographer
)
[connection:protected] =>
[primaryKey:protected] => id
[perPage:protected] => 15
[incrementing] => 1
[timestamps] => 1
[attributes:protected] => Array
(
[id] => 677
[is_photographer] => 1
[ETC>>>>>>>>]
)
[original:protected] => Array
(
[id] => 677
[is_photographer] => 1
[ETC>>>>>>>>]
)
[relations:protected] => Array
(
)
[hidden:protected] => Array
(
)
[visible:protected] => Array
(
)
[appends:protected] => Array
(
)
[guarded:protected] => Array
(
[0] => *
)
[dates:protected] => Array
(
)
[observables:protected] => Array
(
)
[with:protected] => Array
(
)
[morphClass:protected] =>
[exists] => 1
)
// THE $photoTEST result:
Illuminate\Database\Eloquent\Collection Object
(
[items:protected] => Array
(
)
)
这样您就可以看到$photographers_available清空之后刚刚清空->first()。最重要的是，即使直接在初始查询中使用分页，也无法对其进行处理。
$photographers_available; // it is a query, consider other name
$photographers_available->first();
// set limit 1 on the query and return it's result
$photographers_available->get();
// returns the query result (remember limit 1 above..)
$photographers_available->paginate();
// return the query result paginated (ignoring limit 1 above)
我建议您这样做（不带first电话）：
dd($photographers_available->get());
还是return这个东西，而不是echo whataver，因为这不是办法。在控制器中输出类似这样的内容会中断应用程序流程。
回答您所遇到的问题，例如在评论中：将laravel / framework还原到以前的版本（在本地/ dev服务器中）
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我来说两句