belongsTo relationship in laravel 5.8 - php

Question

I want to make a relation between post and user to be able to get all posts by this way $user->posts() and to get user by this way $post->user()
I made belongsTo function but i need a way so when i get the user i can find all his posts somehow
also when i get the post i used \App\Post::find(1)->user()->name it return nothing
Post Model
class Post extends Model
{
public function user() {
return $this->belongsTo('App\User',null,'userid');
}
}
Post DB Structure
Schema::create('posts', function (Blueprint $table) {
$table->bigIncrements('id');
$table->string('title');
$table->longText('body');
$table->string('thumbnail');
$table->integer('views');
$table->integer('likes');
$table->bigInteger('userid');
$table->integer('categoryid');
$table->timestamps();
});
User Model has nothing in it rather than laravel defaults because user has no columns that refer to posts
User DB Structure is Laravel Default
Foreach code:
#foreach(\App\Post::find(4)->user() as $user)
<p>{{$user->name}}</p>
#endforeach
i expected it to get the user name but it didn't..

Answer 1

Use the hasMany relationship.
Within user model:
public function posts()
{
return $this->hasMany(Post::class, 'userid', 'id');
}
Now, you are able to get all user posts:
$posts = User::find($someId)->posts()->get();
//or
$posts = User::find($someId)->posts;
Docs about has many relationship
Hope it helps.

Answer 2

In User model
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
use App\User;
class Post extends Model
{
/**
* Get the comments for the blog post.
*/
public function user()
{
return $this->belongsTo('App\User');
}
}
In User model
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
use App\Post;
class User extends Model
{
/**
* Get the posts for the user.
*/
public function comments()
{
return $this->hasMany('App\Post');
}
}
Now you can access posts of user as App\User::find(id)->posts