Question

我在获取数据库时遇到问题。我有两个型号User，Follower。

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

    class Follower extends Model

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

<?php

namespace App;

use Illuminate\Contracts\Auth\Authenticatable;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Facades\App;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\DB;
use App\Friend;
use App\Follower;

class User extends Model implements Authenticatable
{
public function followers()
   {
       return $this->hasMany('App\Follower','mentor_id','id');
   }

   public function follows()
   {
       return $this->hasMany('App\Follower','user_id','id');
   }
}

数据库＆＃39;粉丝＆＃39;

   <?php

use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreateFollowerTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('followers', function (Blueprint $table) {
            $table->increments('id');
            $table->integer('user_id');
            $table->integer('mentor_id');
            $table->rememberToken();
            $table->timestamps();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('followers');

    }
}

我通过我的FollowerController

获取数据

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Follower;
use Illuminate\Support\Facades\Auth;
use App\User;
class FollowerController extends Controller
{
    public function getFollows(Request $request)
    {
        $follows=Auth::user()->follows()->get();
        return view('follows',['follows' => $follows]);
    }
    public function getFollowers(Request $request)
    {
        $followers=Auth::user()->followers()->get();
        return view('followers',['followers' => $followers]);
    }
}

在这里，我得到了这样的错误 enter image description here

我不知道为什么，但它在SQL请求中添加了＆＃39;用户。＆＃39; 如果你帮助我，我会非常愉快的

Answer 1

你这很复杂。您只需要一个数据透视表来保存关注者信息。

添加follows数据透视表

Schema::create('follows', function (Blueprint $table) {
    $table->unsignedInteger('follower_id');
    $table->unsignedInteger('followed_id');
    $table->timestamps();

    $table->primary(['follower_id', 'followed_id']);

    $table->foreign('follower_id')
        ->references('id')
        ->on('users')
        ->onDelete('cascade');

    $table->foreign('followed_id')
        ->references('id')
        ->on('users')
        ->onDelete('cascade');
});

将此添加到User模型。

public function following()
{
    return $this->belongsToMany(User::class, 'follows', 'follower_id', 'followed_id')->withTimestamps();
}

public function followers()
{
    return $this->belongsToMany(User::class, 'follows', 'followed_id', 'follower_id')->withTimestamps();
}

在您的控制器中执行此操作。

public function getFollows()
{
    $follows = auth()->user()->following;
    return view('follows', ['follows' => $follows]);
}

public function getFollowers()
{
    $followers = auth()->user()->followers;
    return view('followers', ['followers' => $followers]);
}

我基于我的一个OSS项目中实现的以下功能的代码。您可以查看它以了解更多信息。

https://github.com/gothinkster/laravel-realworld-example-app/blob/master/database/migrations/2017_04_27_200850_create_follows_table.php

https://github.com/gothinkster/laravel-realworld-example-app/blob/master/app/RealWorld/Follow/Followable.php

注意：您无需为数据透视表定义模型。您将从用户模型关系中获得关注者和以下信息。

Laravel关系错误

1 个答案: