Laravel 5.2另存關係屬於關聯一對多

Question

您好我有User Model這樣

<?php 

namespace App\Models; 

use Illuminate\Foundation\Auth\User as Authenticatable; 

class User extends Authenticatable 
{ 
    /** 
    * The attributes that are mass assignable. 
    * 
    * @var array 
    */ 
    protected $fillable = [ 
     'role_id', 
     'email', 
     'password', 
     'full_name', 
     'address', 
     'phone', 
     'family_name', 
     'family_address', 
     'family_phone', 
     'idcard', 
     'status', 
     'balance', 
    ]; 

    /** 
    * The attributes excluded from the model's JSON form. 
    * 
    * @var array 
    */ 
    protected $hidden = [ 
     'password', 'remember_token', 
    ]; 

    public function posts(){ 
     return $this->hasMany(Post::class); 
    } 

，我有Post Model這樣

<?php 

namespace App\Models; 

use Illuminate\Database\Eloquent\Model; 

class Post extends Model 
{ 
    protected $fillable = [ 
     'user_id', 
     'title', 
     'content',  
    ]; 

    public function user(){ 
     return $this->belongsTo(User::class);  
    } 
} 

，並在我的Posts Controller

public function store(CreatePostRequest $request) 
{ 
    $user = Auth::user(); 

    $post = Post::create([ 
     'title' => $request->title, 
     'content' => $request->content,   
    ]); 

    $post->user()->associate($user); 

    return redirect()->route('admin.posts.index')->with('success', 'Post berhasil disimpan.'); 
} 

我得到這個錯誤

SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails (`rentcar`.`posts`, CONSTRAINT `posts_user_id_foreign` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE CASCADE ON UPDATE CASCADE) (SQL: insert into `posts` (`title`, `content`, `updated_at`, `created_at`) values (Judul, <p>Isi</p>, 2016-10-20 11:10:31, 2016-10-20 11:10:31)) 

我的商店方法代碼有什麼問題？

如果我想保存文章並將其與當前登錄用戶相關聯，我的代碼應該如何顯示？

Answer 1

create方法立即保存。

因此，無論您指定的USER_ID的創建數組，或者你使用

$post = new Post(); 
$post->title = $request->title; 
$post->content = $request->content; 

$post->user()->associate($user); 

$post->save(); 

Answer 2

確保您在posts表中的外鍵可以爲空。

$table->integer('user_id')->unsigned()->nullable(); 

Answer 3

試試這一個。

public function store(CreatePostRequest $request) 
{ 
    $user = Auth::user(); 

$post = Post::create([ 
    'title' => $request->title, 
    'content' => $request->content, 
    'user_id' => $user->id;  
]); 

return redirect()->route('admin.posts.index')->with('success', 'Post berhasil disimpan.'); 
}