Laravel - get data out from many to many relations - php

Question

I have a many to many relation
public function products()
{
return $this->belongsToMany(Product::class); // relation between books and categories
}
public function parts()
{
return $this->belongsToMany(Part::class); // relation between books and categories
}
my migrations :
public function up()
{
Schema::create('products', function (Blueprint $table) {
$table->increments('id');
$table->unsignedInteger('user_id');
$table->string('link')->default('anohe.com');
$table->string('pname')->default('product');
$table->timestamps();
$table->string('description',3000)->nullable();
$table->string('smalldescription',500)->nullable();
});
}
public function up()
{
Schema::create('parts', function (Blueprint $table) {
$table->increments('id');
$table->string('name');
$table->timestamps();
});
}
public function up()
{
Schema::create('part_product', function (Blueprint $table) {
$table->increments('id');
$table->unsignedInteger('product_id');
$table->unsignedInteger('part_id');
$table->timestamps();
$table
->foreign('product_id')
->references('id')
->on('products')
->onDelete('cascade');
$table
->foreign('part_id')
->references('id')
->on('parts')
->onDelete('cascade');
});
}
How can I get products that have a special part_id?

Answer 1

If your relations are correct, that should work:
$specialPartIds = [1];
$products = Product::whereHas('parts', function ($query) use ($specialPartIds) {
$query->whereIn('id', $specialPartIds);
})->get();
dd($products->toArray());