belongsTo(Invoice::class); } public function unitPriceSubcategories() { return $this->hasMany(UnitPriceSubcategory::class)->orderBy('sequence_number', 'asc')->orderBy('id', 'desc'); } public function budgetPlans() { return $this->belongsToMany(BudgetPlan::class, 'budget_plan_prices') ->using(BudgetPlanPrice::class) ->withPivot('id', 'price', 'qty', 'subtotal', 'images'); } }