Handling errors in defer

问题

I have a function which open db connection and return it. Or error, if something happened:

OpenDbConnection(connectionString string, logSql bool) (*gorm.DB, error) 

In this function I am using logger:

logger := zap.NewExample().Sugar()
defer logger.Sync()

Method Sync() returns error and I am ignoring this error.

What is the best strategy in this case ?

I can rewrite my code to avoid linter error, but I am still ignore error:

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

I can return error, but I am have correct db connection and I need to analyze this error in the calling function to understand what to do.

回答1:

You can name your returning error variable and initialize anywhere inside the function.

check this test code here

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

}

来源：https://stackoverflow.com/questions/57740428/handling-errors-in-defer