Feat[BE-261,265]: createing BOP and BOP realization(Unfinished)

internal/modules/expenses/repositories/expense.repository.go

@@ -11,6 +11,8 @@ import (
 type ExpenseRepository interface {
 	repository.BaseRepository[entity.Expense]
 	IdExists(ctx context.Context, id uint64) (bool, error)
+	GetNextSequence(ctx context.Context) (int, error)
+	GetWithSupplier(ctx context.Context, id uint64) (*entity.Expense, error)
 }
 
 type ExpenseRepositoryImpl struct {
@@ -26,3 +28,24 @@ func NewExpenseRepository(db *gorm.DB) ExpenseRepository {
 func (r *ExpenseRepositoryImpl) IdExists(ctx context.Context, id uint64) (bool, error) {
 	return repository.Exists[entity.Expense](ctx, r.DB(), uint(id))
 }
+
+func (r *ExpenseRepositoryImpl) GetNextSequence(ctx context.Context) (int, error) {
+	var sequence int
+	err := r.DB().Raw("SELECT nextval('expenses_ref_seq')").Scan(&sequence).Error
+	if err != nil {
+		return 0, err
+	}
+	return sequence, nil
+}
+
+func (r *ExpenseRepositoryImpl) GetWithSupplier(ctx context.Context, id uint64) (*entity.Expense, error) {
+	var expense entity.Expense
+	err := r.DB().WithContext(ctx).
+		Where("id = ?", id).
+		Preload("Supplier").
+		First(&expense).Error
+	if err != nil {
+		return nil, err
+	}
+	return &expense, nil
+}