Laravel 所属关系返回一个 id 而不是 model

Question

I'm learning laravel, but i've ran into a problem and i can't seem to get it right. I have two models:

Model 'Group':

 Schema::create('groups', function (Blueprint $table) {
        $table->increments('id')->unique();
        $table->string('name')->unique();
        $table->text('description')->nullable();
        $table->string('picture')->nullable();
        $table->timestamps();
    });

and model 'User':

Schema::create('users', function (Blueprint $table) {
        $table->increments('id');
        $table->string('first_name');
        $table->string('last_name');
        $table->string('email')->unique();
        $table->string('password');
        $table->timestamp('email_verified_at')->nullable();
        $table->timestamps();
        $table->rememberToken();
    });

These models should have a many-to-many relationship, so i've created a pivot table named 'group_user':

Schema::create('group_user', function (Blueprint $table) {
        $table->increments('id');

        $table->integer('group_id')->unsigned();
        $table->foreign('group_id')->references('id')->on('groups')->onDelete('cascade');

        $table->integer('user_id')->unsigned();
        $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');

        $table->timestamps();
    });

Next i defined the many-to-many relationship:

In the 'Group' model:

 public function members()
{
    return $this->belongsToMany('App\User', 'group_user', 'group_id', 'user_id')->withTimestamps();
}

In the 'User' model:

public function groups() {
    return $this->belongsToMany('App\Group', 'group_user', 'user_id', 'group_id')->withTimestamps();
}

In my database i have a pivot record, that links group 1 to user 1:

+----+----------+---------+------------+------------+
| id | group_id | user_id | created_at | updated_at |
+----+----------+---------+------------+------------+
|  1 |        1 |       1 | NULL       | NULL       |
+----+----------+---------+------------+------------+

So far so good, but when i try to print the members of group 1:

@foreach($group->members() as $user)
   <p>{{ $user->first_name }}</p>
@endforeach

i get this error:

Trying to get property 'first_name' of non-object

When i print the user object like this

 @foreach($group->members() as $user)
   <p>{{ $user }}</p>
@endforeach

I get the result 1 , which is the user_id of the member. Can anyone point out where i messed up? Been looking at it for hours, but i just can't see it. Thanks in advance!

Answer 1

try $group->members instead of $group->members() . Because $group->members() return the relationship builder.