inserting a new transaction

internal/models/models.go

@@ -113,3 +113,31 @@ func (m *DBModel) GetWidget(id int) (Widget, error) {
 	}
 	return widget, nil
 }
+
+// InsertTransaction inserts a new txn, and returns its id
+func (m *DBModel) InsertTransaction(txn Transaction) (int, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
+	defer cancel()
+
+	stmt := `INSERT INTO transactions
+             (amount, currency, last_four, bank_return_code,
+             transaction_status_id, created_at, updated_at)
+             VALUES (?, ?, ?, ?, ?, ?, ?)`
+
+	result, err := m.DB.ExecContext(ctx, stmt,
+		txn.Amount,
+		txn.Currency,
+		txn.LastFour,
+		txn.BankReturnCode,
+		txn.TransactionStatusID,
+		txn.CreatedAt,
+		txn.UpdatedAt)
+	if err != nil {
+		return 0, err
+	}
+	id, err := result.LastInsertId()
+	if err != nil {
+		return 0, err
+	}
+	return int(id), nil
+}