Laravel hasOne (one to one relationship) - laravel

Question

I am trying to learn Laravel-> one to one relationship.
In given code link(join) should be dependent on name(user2s table) and title(post2s table) but the link(join) is dependent on my_id(user2s table) and title(post2s table)
My full codes
Migrations:-
user2s table
Schema::create('user2s', function (Blueprint $table) {
$table->increments('my_id');
$table->string('name');
$table->string('email');
$table->string('password');
$table->string('remember_token');
$table->timestamps();
});
post2u table:
Schema::create('post2s', function (Blueprint $table) {
$table->increments('id');
$table->integer('user_id')->unsigned();
$table->string('title');
$table->text('content');
$table->timestamps();
$table->tinyInteger('is_admin');
});
Model User2
protected $primaryKey = 'my_id';
public function postx(){
return $this->hasOne(Post2::class, 'title', 'name');
}
My Route Code
Route::get('user/{id}/post', function($id){
return User2::find($id)->postx;
});
http://localhost:8000/user/abc/post
error: Trying to get property of non-object
user2s table
post2s table

Answer 1

Let me explain what is your issue.
error: Trying to get property of non-object, it means it can't find the result. The result object is null, so when you looking for null->postx, it can't get them anything.
You search for User2::find($id), when you use find(), it is looking for primary key. And you User2 Model primary key is my_id, and you are looking for Post2->title. It not able to find it.
More infor about find()
https://laravel.com/docs/5.5/eloquent#retrieving-single-models
Since you are looking for the Post2 title. And you are referencing from User2. It is not correct.
What you should do is
In your route.php
Route::get('user/{title}/post', function($title){
//return Post2::all();
$post = Post2::with('userx')->where('title', $title)->first();
dump($post);
dump($post->userx)//<- you can get user info via
});
In Post2 Model.
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Post2 extends Model
{
public function userx(){
return $this->belongsTo(User2::class, 'user_id');
}
}