Inserting to multiple table with foreign key in Laravel Eloquent - php

Question

These is my first time using the laravel framework and so far it is well structure than others i have used. But these have left me struck in an error i have been debugging a while.
I have a Post model that have sub model Post Images and Post Location. I am trying to insert data to the Post Images and then get the id of the save data into the base Model Post so i can make the relationship these are my code
Post Model
class Post extends Model {
protected $table = 'posts';
public $primaryKey = 'id';
public function user(){
return $this->belongsTo('App\User');
}
public function post_image(){
return $this->belongsTo('App\PostImage');
}
public function location(){
return $this->belongsTo('App\PostLocation');
}
}
Migrated From create post
public function up(){
Schema::create('posts', function (Blueprint $table) {
$table->increments('id');
$table->string('name');
$table->integer('user_id')->unsigned();
$table->integer('location_id')->unsigned();
$table->integer('post_image_id')->unsigned();
$table->timestamps();
});
Base model Relationship are
class PostImage extends Model{
protected $table = 'post_images';
public $primaryKey = 'id';
public function post(){
return $this->belongsTo('App\Post');
}
}
class PostLocation extends Model{
protected $table = 'location';
public $primaryKey = 'id';
public function post(){
return $this->belongsTo('App\Location');
}
}
In the Post Controller store method. I am saving the post image first and then try to reference the inserted table id as the foreign key and error occur after a while i try to different combination it doesnt work. The images are sucecfully save but the reference dosent work
Post controller store code
public function store(Request $request){
$this->validate($request, [
// Validation work here
]);
// Function to save images work perfectly and return the an array containg image
$images = $this->uploadAssetImages($request);
$post= new Post();
$image = new PostImage();
$image->image1 = $images[0];
$image->image2 = $images[1];
$image->image3 = $images[2];
$image->save();//$image->id()
//I have try these: $image_id = Response::json(array('success' => true, 'last_insert_id' => $image->id), 200);
$asset->description = $request->input('description');
$asset->user_id = auth()->user()->id;
$asset->post_image()->save($image);// After debuging error is found here
$asset->save();
Hope these can be resolve?