php - SELECT 列表不在 GROUP BY 子句中并且包含非聚合列 'explore.ratings.id'

Question

我要做的是选择行程，然后按费率对它们进行分组。

note: ratings is a polymorphic relationship

假设我们有 2 个模型:

trips
  id => int
  price => float
  city_id => uint
........

ratings:
  id => int
  ratable_id => int
  ratable_type=> varchar
  rate => small-int
......

我是怎么做的:

\App\Models\Trip::where('price','>=','100')->with(['ratings' => function ($query) {
        $query->groupBy('ratings.rate');
    }])->get();

和哎呀!:

"SQLSTATE[42000]: Syntax error or access violation: 1055 Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'explore.ratings.id' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by (SQL: select * from ratings where ratings.ratable_id in (1, 2) and ratings.ratable_type = App\Models\Trip group by ratings.rate)

Answer 1

使用不同的方法:

$grouped = [];
$trips = \App\Models\Trip::where('price', '>=', '100')->with('ratings')->get();
foreach($trips as $trip) {
    foreach($trip->ratings as $rating) {
        $grouped[$rating->rate][] = $trip;
    }
}

或者使用 JOIN:

$trips = \App\Models\Trip::select('trips.*', 'ratings.rate')
    ->join('ratings', 'ratings.ratable_id', 'trips.id')
    ->where('ratings.ratable_type', 'App\Models\Trip')
    ->where('trips.price', '>=', '100')
    ->get();
$grouped = $trips->groupBy('rate');