Laravel：如何从数据透视表中获取记录？

Question

我使用的是 Lumen 5.1，任务和用户之间存在多对多关系

任务模型

public function user()
{
    return $this->belongsToMany('App\Models\Auth\User', 'task_user');
}

public function domain()
{
    return $this->hasOne('App\Models\Domain', 'domain_id');
}

用户模型

public function tasks()
{
    return $this->belongsToMany(Task::class, 'task_user');
}

用户任务模型

class UserTask {}

我要搜索任务的获取用户，我的代码是

$tasks = Task::Where(function ($query) use ($domainId) {
    $query->where("domain_id", $domainId)
        ->where("is_done", 0)
        ->orwherehas('tasks.user.id', \Auth::id)
        ->orderBy('due_date', 'DESC');
})
->orWhere(function ($query) use ($domainId) {
    $query->where("domain_id", $domainId)
        ->Where("is_done", 1)
        ->Where("closed_dated", Carbon::today())
        ->orwherehas('tasks.user.id', \Auth::id)
        ->orderBy('closed_date', 'ASC');
})
->get();

我的问题是whereHas 对吗？ tasks.user.id 正确吗？我可以通过这种方式获取用户的 id 吗？我这样做是因为this question

技术负责人告诉我我的代码有误，他会使用where，他说当你想运行闭包时使用whereHas。

迁移：

任务

public function up()
{
    Schema::create($this->getTable(), function (Blueprint $table) {
        $table->increments('id');
        $table->string('title')->nullable();
        $table->dateTime('submit_date');
        $table->dateTime('closed_date');
        $table->dateTime('due_date');
        $table->tinyInteger('is_done')->default(0);

        $table->integer('domain_id')->unsigned()->nullable();
        $table->foreign('domain_id')->references('id')
            ->on(self::getTableName('domains'))->onDelete('cascade');

        $table->bigInteger('created_by')->unsigned()->nullable();
        $table->foreign('created_by')->references('id')
            ->on(self::getTableName('auth_users', false))->onDelete('cascade');

        $table->bigInteger('closed_by')->unsigned()->nullable();
        $table->foreign('closed_by')->references('id')
            ->on(self::getTableName('auth_users', false))->onDelete('cascade');
        $table->timestamps();
    });

}

public function down()
{
    Schema::drop($this->getTable());
}

task_user

public function up()
{
    Schema::create($this->getTable(), function (Blueprint $table) {
        $table->increments('id');
        $table->integer('task_id')->unsigned()->nullable();
        $table->foreign('task_id')->references('id')
            ->on(self::getTableName('tasks'))
            ->onDelete('cascade');

        $table->bigInteger('user_id')->unsigned()->nullable();
        $table->foreign('user_id')->references('id')
            ->on(self::getTableName('auth_users', false))
            ->onDelete('cascade');
    });

}

public function down()
{
    Schema::drop($this->getTable());
}

Answer 1

不，whereHas 在这里对两者都不正确。此外，您不会在 Task 模型上说 whereHas('tasks...')。

注意

whereHas 的第二个参数应该是一个闭包（函数），Auth::id 应该是Auth::id()。如果您愿意，也可以使用 auth() 辅助函数来代替 Auth 外观。

以下内容应该可以满足您的需求：

$tasks = Task::where("domain_id", $domainId)
    ->where(function ($query) use ($domainId) {
        $query
            ->where("is_done", 0)

            //whereHas - 1st arg = name of the relationship on the model, 2nd arg = closure
            ->whereHas('user', function ($query) {
                $query->where('id', auth()->id());
            });
    })
    ->orWhere(function ($query) use ($domainId) {
        $query
            //If "is_done" = 1 only when it's been closed then you won't need to check "is_done"
            ->where("is_done", 1)
            ->where('closed_by', auth()->id())
            ->whereDate("closed_dated", '>=', Carbon::today()->startOfDay());
    })
    ->orderBy('due_date', 'DESC')
    ->orderBy('closed_date', 'ASC')
    ->get();

Answer 2

以下博客文章介绍了一对多任务分配示例。

https://medium.com/@brice_hartmann/building-a-user-based-task-list-application-in-laravel-eff4a07e2688

获取当前用户的任务，belongsToMany 与 User 模型的关系是：

Auth::user()->tasks()->where('is_done',0) .... ->get();

与用户一起获取任务：

Tasks::with(['user'])->where('is_done',1) ... ->get();

经过验证的用户结论...我不是 100% 确定这是正确的：

Auth::user()->tasks()
    ->where('domain_id', $domainId)
    ->where(function ($query) {
        $query->where('is_done', 1)
              ->orWhere(function($query) {
                 $query->where('is_done', 0)
                       ->where('closed_dated', Carbon::today())
            });
        });
    })
    ->get();