hasMany(Customer::class); } public function items() { return $this->hasMany(Item::class); } public function invoices() { return $this->hasMany(Invoice::class); } public function estimates() { return $this->hasMany(Estimate::class); } public function expenses() { return $this->hasMany(Expense::class); } public function payments() { return $this->hasMany(Payment::class); } public function recurringInvoices() { return $this->hasMany(RecurringInvoice::class); } }