User.php

<?php

namespace App\Models;

use Illuminate\Notifications\Notifiable;
use Illuminate\Foundation\Auth\User as Authenticatable;
use App\Notifications\ResetPassword;
use Illuminate\Support\Facades\Auth;

class User extends Authenticatable
{
    use Notifiable;

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'name', 'email', 'password',
    ];

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


    public function gravatar($size = '100')
    {
        $hash = md5(strtolower(trim($this->attributes['email'])));
        return "http://www.gravatar.com/avatar/$hash?s=$size";
    }


    public static function boot()
    {
        parent::boot();

        static::creating(function ($user) {
            $user->activation_token = str_random(30);
        });
    }


    public function sendPasswordResetNotification($token){
        $this->notify(new ResetPassword($token));
    }


    public function feed()
    {
        $user_ids = Auth::user()->followings->pluck('id')->toArray();
        array_push($user_ids, Auth::user()->id);
        return Status::whereIn('user_id', $user_ids)
            ->with('user')
            ->orderBy('created_at', 'desc');
    }

    /**
     * 关注(成为粉丝)
     * @param $user_ids
     */
    public function follow($user_ids)
    {
        $this->followings()->sync((array)$user_ids, false);
    }

    /**
     * 取消关注
     * @param $user_ids
     */
    public function unfollow($user_ids)
    {
        $this->followings()->detach((array)$user_ids);
    }

    /**
     * 一个用户有多个粉丝
     * @return \Illuminate\Database\Eloquent\Relations\BelongsToMany
     */
    public function followers()
    {
        return $this->belongsToMany(User::Class, 'followers', 'user_id', 'follower_id');
    }

    /**
     * 一个粉丝可以关注多个用户
     * @return \Illuminate\Database\Eloquent\Relations\BelongsToMany
     */
    public function followings()
    {
        return $this->belongsToMany(User::Class, 'followers', 'follower_id', 'user_id');
    }


    /**
     * 判断当前用户有没有关注$usr_id用户
     * @param $user_id 被关注的用户id
     * @return mixed
     */
    public function isFollowing($user_id)
    {
        return $this->followings->contains($user_id);
    }

    /**
     * 指定一个用户有多条微博
     */
    public function statuses(){
        return $this->hasMany(Status::class);
    }
}