Question

我需要找出给定团队中的当前球员。我为此创建了一个范围。要求是它检查数据透视表以查看left_at字段是否为null。如果为Null，则表示他们仍在队中（当前球员）。该关系是多态多对多关系。之所以具有多态性，是因为团队也可以让球员和教练一样来去去去。

Team.php

/**
 * Scope a query to only include current players.
 *
 * @param  \Illuminate\Database\Eloquent\Builder $query
 */
public function scopeCurrentPlayers($query)
{
    return $query->whereHasMorph('players', Player::class, function ($query) {
        $query->whereNull('left_at');
    });
}

**
 * Get all players that have been members of the stable.
 *
 * @return \Illuminate\Database\Eloquent\Relations\MorphByMany
 */
public function players()
{
    return $this->morphedByMany(Player::class, 'member')->using(Member::class)->withPivot(['joined_at', 'left_at']);
}

控制器

$currentTeamPlayers = $team->currentPlayers()->get()->pluck('id');

我希望能从团队中收集到目前的球员，但是我收到以下错误。

+异常：Symfony \ Component \ Debug \ Exception \ FatalThrowableError ^ {＃5387 -originalClassName：“ TypeError” #message：“传递给Illuminate \ Database \ Eloquent \ Builder :: getBelongsToRelation（）的参数1必须是Illuminate \ Database \ Eloquent \ Relations \ MorphTo的实例，Illuminate \ Database \ Eloquent \ Relations \ MorphToMany的实例，称为in /Users/jeffreydavidson/Projects/Ringside/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Concerns/QueriesRelationships.php行215“`

在本地范围内对MophByMany关系使用whereHasMorph

0 个答案: