How Can You Handle Errors in Defer with Returning Values?

Handling Errors in Defer with Returning Values

In situations where you have a function that connects to a database and returns the connection or an error, you may employ defer to handle error handling. However, ignoring the error returned by the Sync method of the logger is not best practice.

One approach to avoid linter errors without suppressing the error is to use an anonymous function, as seen below:

logger := zap.NewExample().Sugar()
defer func() {
    _ = logger.Sync()
}()

While this approach addresses the linter issue, it does not provide a means to analyze the returned error in the calling function.

A more robust solution is to initialize an error variable named err anywhere within the function and use named return values:

func OpenDbConnection(connectionString string, logSql bool) (db *gorm.DB, err error) {

    logger := zap.NewExample().Sugar()
    defer func() {
        err = logger.Sync()
    }()

    // Some logic here

    return db, err

}

This method allows you to capture the error and return it to the calling function, enabling proper error analysis.

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