How to provide string formatting for structs?

Question

I've a struct called item

type Item struct {
    Limit int
    Skip int
    Fields string
}



item := Item {
            Limit: 3,
            Skip: 5,
            Fields: "Valuie",
    }

how could I get the field name, value and join it into a string.

something like:

item := Item {
            Limit: 3,
            Skip: 5,
            Fields: "Valuie",
    }

to a string something like

"Limit=3&Skip=5&Fields=Valuie"

---

And I've try reflections to get convert interface to field value map so far. Am I going the right way? Cause I think there might have some better solutions. And thanks!

m, _ = reflections.Items(data)
for k, v := range m {
    fmt.Printf("%s : %s\n", k, v)
}

I've got

Limit : %!s(int=3)
Skip : %!s(int=5)
Fields : Valuie

Answer 1

You can use %v instead of %s. %s will assume a string, something that can be converted to a string (i.e. byte array) or an object with a String() method. Using %v will check the type and display it correctly.

Example of the String() method call with %s with your example: http://play.golang.org/p/bxE91IaVKj