laravel 带有消息“...必须返回关系实例”的 LogicException。
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LogicException with message '... must return a relationship instance.'
提问by Amruth Pillai
Tried searching the entire internet for this error, but all in vain, so as a last resort, I'm creating a question here on StackOverflow.
试图在整个互联网上搜索这个错误，但都是徒劳的，所以作为最后的手段，我在 StackOverflow 上创建了一个问题。
I have two simple Eloquent Models set up:
1. Teacher(extends Authenticable) - since I'm using MultiAuth for the system.
2. GeneralNotice(extends Eloquent/Model)
我设置了两个简单的 Eloquent 模型：
1. 教师（扩展 Authenticable） - 因为我在系统中使用 MultiAuth。
2. GeneralNotice（扩展 Eloquent/Model）
app\Teacher.php
app\Teacher.php
public function generalNotices()
{
$this->hasMany('App\Modules\GeneralNotice');
}
app\Modules\GeneralNotice.php
app\Modules\GeneralNotice.php
public function teacher()
{
$this->belongsTo('App\Teacher');
}
This is my migration table for General Notices:
这是我的一般通知迁移表：
database/migrations/***_create_general_notices_table.php
database/migrations/***_create_general_notices_table.php
Schema::create('general_notices', function (Blueprint $table) {
$table->increments('id');
$table->string('title');
$table->longtext('description')->nullable();
$table->string('attachment')->nullable();
$table->integer('teacher_id')->unsigned();
$table->foreign('teacher_id')->references('id')->on('teachers');
$table->date('dated_on')->default(now());
$table->timestamps();
});
I have also seeded the database with a sample notice, to check if it works.
我还在数据库中植入了一个示例通知，以检查它是否有效。
When I try to access any of these relations, I run into an error.
当我尝试访问这些关系中的任何一个时，我遇到了错误。
$teacher = Teacher::find(1);
$teacher->generalNotices;
$teacher = Teacher::find(1);
$teacher->generalNotices;
LogicException with message 'App\Teacher::generalNotices must return a relationship instance.'
带有消息“App\Teacher::generalNotices 必须返回关系实例”的 LogicException。
$notice = GeneralNotice::find(1);
$notice->teacher;
$notice = GeneralNotice::find(1);
$notice->teacher;
LogicException with message 'App\Modules\GeneralNotice::teacher must return a relationship instance.'
LogicException 消息为“App\Modules\GeneralNotice::teacher must return a relationship instance”。
If I try to access the member function,$teacher->generalNotices()OR$notice->teacher()
如果我尝试访问成员函数，$teacher->generalNotices()或者$notice->teacher()
I get null.
我得到null。
Please help.
请帮忙。
回答by Alexey Mezenin
You need to returnrelationship, for example:
你需要建立return关系，例如：
public function teacher()
{
return $this->belongsTo('App\Teacher');
}
