Laravel querybuilder withCount 关系

Question

我遇到脚本问题。我正在使用 Laravel 6.x（但没有太大区别）。

所以，我有一个模型 Order，它与另一个模型 Group 有这样的关系：

型号订单：

public function groups()
{
    return $this->hasMany('App\Models\Order\Group', 'order_id')->orderBy('order_group');
}

模型组：

public function order()
{
    return $this->belongsTo('App\Models\Order\Order', 'order_id');
}

我想要所有 Order 有一个组，其中组内的列 'is_recurrent' 是 true 并且至少有 2 行 'is_recurrent' true.

基本上是这样的：

$orders = Order::withCount(['groups' => function ($query) {
    $query->where('is_recurrent', true);
}])
->having('groups_count', '>', 1)
->get();

我尝试过很多东西，比如 Order::whereHas('groups', 函数 ....).

在很多情况下我得到了：

SQLSTATE[42803]: Grouping error: 7 ERROR: column "ordergroups.order_group" must appear in the GROUP BY clause or be used in an aggregate function
LINE 1: ... "is_recurrent" = group by "order_id" order by "order_gro...
^ (SQL: select "orders"., (select count() from "ordergroups" where "orders"."id" = "ordergroups"."order_id" and "is_recurrent
" = 1 group by "order_id" order by "order_group" asc) as "groups_count" from "orders" having "groups_count" > 1 order by "created_at" desc)

有

$orders = Order::withCount(['groups' => function ($query) {
    $query->where('is_recurrent', true)->groupBy('order_group');
}])
->having('groups_count', '>', 1)
->get();

我得到了：

SQLSTATE[42703]: Undefined column: 7 ERROR: column "groups_count" does not exist
LINE 1: ...roup" asc) as "groups_count" from "orders" having "groups_co...
^ (SQL: select "orders"., (select count() from "ordergroups" where "orders"."id" = "ordergroups"."order_id" and "is_recurrent
" = 1 group by "order_group" order by "order_group" asc) as "groups_count" from "orders" having "groups_count" > 1 order by "created_at" desc)

如果有人有任何线索:D

Answer 1

withCount 函数向您的模型添加了一个变量，它在查询中不可用（至少据我所知）。

根据您 table 结构的少量信息，这应该会给出正确的结果；在相同的查询中使用 whereHas，您将确保至少有 1 个组具有 is_recurrent = true，而使用 withCount 将为您提供单个订单模型的完整计数。

$orders = Order::withCount(['groups' => function ($query) {
    $query->where('is_recurrent', true)->groupBy('order_group');
}])
->whereHas(['groups' => function ($query) {
    $query->where('is_recurrent', true)->groupBy('order_group');
}])
->get();

Laravel querybuilder withCount 关系

Laravel querybuilder withCount relationship

laravel

relationship

laravel-6