Laravel - create on hasmany not working - php

Question

The inserted row key,value are empty !!
\App\Product::find(1)->getProductMeta()->create([
'key' => 'a key',
'value' => 'a value'
]);
query SQL :
insert into `product_metas` (`product_id`) values (?)
Product:
function getProductMeta(){
return $this->hasMany('App\ProductMeta');
}
ProductMeta:
protected $fillable = ['key','value'];
Migration:
Schema::create('product_metas', function (Blueprint $table) {
$table->increments('id');
$table->integer('product_id')->unsigned()->index();
$table->foreign('product_id')->references('id')->on('products')->onDelete('cascade');;
$table->string('key')->index();
$table->text('value')->nullable();
});

Answer 1

I don't see anything wrong with your code. Just try one of these methods to create the relationship item.
Add this to ProductMeta model
protected $fillable = ['key', 'value', 'product_id'];
In your controller do this so that you can get a valid product.
$product = Product::findOrFail(1);
Then
$product->getProductMeta()->create([
'key' => 'a key',
'value' => 'a value'
]);
Or
\App\ProductMeta::create([
'key' => 'a key',
'value' => 'a value',
'product_id' => $product->id
]);
Or
$productMeta = new \App\ProductMeta;
$productMeta->key = 'a key';
$productMeta->value = 'a value';
$productMeta->product_id = $product->id;
$productMeta->save();

Answer 2

i'v solved my problem with remove function __construct in my Model .
I don't know why i'v made a __construct method !

Answer 3

you have to make relation in both models eg. Product model and admin model
for example you say in your product model
public function admin(){
return $this->belongsTo(Admin::class, 'admin_id');
}
and in your admin model
public function product(){
return $this->hasMany(Product::class);
}
like this both tables and models will be related to each other.
PS: I don't know your exact model and tables so i just assume admins as publishers and products as post you can change it to your table names.