Generate String() methods for model types

[leventov]

Would be nice if gqlgen generated String() methods for model types. GraphQL's Boolean, Float, Int translate into Go's *bool, *float64, *int which are not printed well by Go's "%#v" formatting.

[frederikhors]

Can you write here an example, please? We can help then with PR.

[leventov]

GraphQL type:

type MyType {
  flag: Boolean
}

Generated Go code:

type MyType struct {
	flag *bool
}

func (t *MyType) String() string {
	flagS := "null"
	if (t.flag != nil) {
		flagS := strconv.FormatBool(*t.flag)
	}
	return fmt.Sprintf("MyType{flag: %s}", flagS)
}

[frederikhors]

Where are they using “%#v”?

Are they using this for bool for example? https://github.com/99designs/gqlgen/blob/master/graphql/bool.go

[leventov]

Who are "they"?

We are using %#v because this is the best we can have (for debug logging, for example) in the absence of generated String() method, but it doesn't print the values of all the optional fields (and optional sub-structures) because %#v doesn't dereference pointers in Go.