Get Many Through and reverse in Laravel 9 - laravel

Question

I am building an app that has multiple vendors selling products. I need to isolate the customers who have placed an order with that particular vendor.
I have 3 models; Vendor, Customer, Order.
Vendor 'hasMany' Orders.
Order 'belongsTo' Vendor
Order 'belongsTo' Customer
Customer 'hasMany' Orders
class Vendor extends Model
{
/**
* #return HasMany
*/
public function orders(): HasMany
{
return $this->hasMany(Order::class);
}
}
class Order extends Model
{
/**
* #return BelongsTo
*/
public function customer() : BelongsTo
{
return $this->belongsTo(Customer::class);
}
/**
* #return BelongsTo
*/
public function vendor() : BelongsTo
{
return $this->belongsTo(Vendor::class);
}
}
class Customer extends Model
{
/**
* #return HasMany
*/
public function orders(): HasMany
{
return $this->hasMany(Order::class);
}
}
I would like to get all of the orders for a vendor, something like:
class Vendor extends Model
{
/**
* #return HasManyThrough
*/
public function customers(): HasManyThrough
{
return $this->hasManyThrough(Customer::class, Order::class);
}
}
What is the best way to do this?
I have tried hasManyThrough, however as the relationships are not one directional, it doesn't appear to work.
Edit: Here's the relevant migrations:
Vendor
Schema::create('vendors', function (Blueprint $table) {
$table->id();
$table->string('name')->nullable();
$table->string('logo')->nullable();
$table->string('business_type', 32);
$table->string('address', 128)->nullable();
$table->string('postcode', 16);
$table->bigInteger('town_id')->unsigned()->index();
$table->string('website', 128)->nullable();
$table->string('telephone', 64)->nullable();
$table->tinyInteger('approved')->default(0);
$table->timestamps();
});
Customer
Schema::create('customers', function (Blueprint $table) {
$table->id();
$table->string('email')->unique();
$table->string('first_name');
$table->string('last_name');
$table->timestamp('email_verified_at')->nullable();
$table->string('password');
$table->boolean('is_active');
$table->string('country');
$table->timestamps();
});
Order
Schema::create('orders', function (Blueprint $table) {
$table->id();
$table->string('status')->index();
$table->bigInteger('customer_id')->unsigned()->nullable()->index();
$table->bigInteger('vendor_id')->unsigned()->index()->nullable();
$table->string('reference')->nullable()->unique()->index();
$table->decimal('sub_total')->default(0);
$table->decimal('discount_total')->default(0);
$table->decimal('shipping_total')->default(0);
$table->decimal('tax_total')->default(0);
$table->decimal('grand_total')->default(0);
$table->timestamps();
});

Answer 1

I would like to get all of the orders for a vendor
Then you need to fix your Vendor model as follow (same for Customer model)
class Vendor extends Model
{
public function orders()
{
return $this->hasMany(Order::class);
}
}
If your order belongs to more relationships than now, you should consider Polymorphic Relationships