Question

我试图通过id从另一个表中获取列，但是每当我在视图中使用foreach时，都会出现此错误

属性[id]在此集合实例上不存在。（视图：C：\ xampp \ htdocs \ myUniMentor \ resources \ views \ userProfile \ viewUserProfilePage.blade.php）

但是如果我运行的代码没有foreach这样的$users->reviews命令，则会得到review表的数组以及该特定ID的所有相关内容，然后执行$users->reviews->comments给我一个错误

属性[comments]在此集合实例上不存在。（视图：C：\ xampp \ htdocs \ myUniMentor \ resources \ views \ userProfile \ viewUserProfilePage.blade.php）

我的问题是：

如何使用模型显示评论？
$users->reviews如何仅返回与ID关联的列？是因为我在belongsTo()中传递了ID？

ReviewController.php

public function showUserProfile($id) {

        $users = User::find($id);

        // echo $users->first_name;

        return view('userProfile.viewUserProfilePage', compact('users'));
    }
}

 public function addNewReview($id) {

        $stars = Input::get("rating");
        $message = Input::get("message");

        // $users = User::find($id);

        $users = User::where('id', $id)->first();
        // echo $stars;
        // echo $message;
        // echo $users;
        // echo $users->id;
        // echo Auth::user()->id;
        // die();
        $reviews = new Review();
        $reviews->user_id = $users->id;
        $reviews->given_by = Auth::user()->first_name . ' ' . Auth::user()->last_name;
        $reviews->stars = $stars;
        $reviews->comments = $message;

        $reviews->save();

        Session::flash('message','Your Review has been added to the Mentor');
        return redirect('show-user-profile/' . $users->id);
    }

show-user-profile.blade.php

@section('content2')

<h3>Reviews</h3>
<p>{{ $users->reviews->comments }}</p> 

@endsection

Review.php

namespace App;

use Illuminate\Database\Eloquent\Model;
use App\User;

class Review extends Model
{
    protected $fillable = [
        'comments', 'stars', 'given_by',
    ];

    public function users()
     {
         return $this->belongsTo('App\User', 'user_id','id');
     }
}

User.php

<?php

namespace App;

use Illuminate\Notifications\Notifiable;
use Illuminate\Contracts\Auth\MustVerifyEmail;
use Illuminate\Foundation\Auth\User as Authenticatable;

use App\UserType;
use App\Subject;
use App\SubjectKeyword;
use App\Review;

class User extends Authenticatable
{
    use Notifiable;

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'first_name', 'last_name', 'type', 'username', 'password',
    ];

    /**
     * The attributes that should be hidden for arrays.
     *
     * @var array
     */
    protected $hidden = [
        'password', 'remember_token',
    ];

    /**
     * The attributes that should be cast to native types.
     *
     * @var array
     */
    protected $casts = [
        'email_verified_at' => 'datetime',
    ];

    public function getAllUsers() {
        return User::all();
     }

    public function userTypes()
    {
            return $this->belongsTo('App\Users');
    }

    // public function subjects()
    // {
    //     return $this->belongsToMany('App\Subject');
    // }

    public function subjects(){
        return $this->belongsTo('App\Subject','subject_id','id');
    }

    public function reviews(){
        return $this->hasMany('App\Review');
    }

    public function subjectKeywords(){
        return $this->hasMany('App\SubjectKeyword');
    }
}

Answer 1

目前尚不清楚您要在刀片文件中执行的操作。但是，如果您要打印用户所有评论的所有评论。

显示用户个人资料刀片

@section('content2')

    <h3>Reviews</h3>
    @foreach($user->reviews as $review)
        <p>{{ $review->comments }}</p>
    @endforeach 

@endsection

说明

reviews()是user的一对多关系，$user->reviews是一个集合。因此，如果要访问review的任何属性，则需要遍历集合。

Answer 2

请更改以下内容：

在您的HTML中

@foreach($users->reviews as $review)
 <p>{{ $review->comments }}</p> 
@endforeach

在您的Review.php中，由于评论属于用户，因此更改为

public function user()
{
  return $this->belongsTo('App\User');
}

我正在尝试从数组中获取列，但可以在laravel中获取它

2 个答案: