On Saturday, August 24, 2019 at 3:39:27 AM UTC-4, Lee Rick wrote:
>
> think that there are two struct, they have different fields, hope that
> there has a function merge(a,b interface{}) interface{}, input param are
> any two struct, they may have same-type, or have different-type. output
> param is a struct that composed the two input struct, example type A
> sturct{Name string}, type B struct{Age int}, a,b :=A{"xxx"},B{10} called
> c:= merge(a,b), c is interface{}, and
>
> import "github.com/google/go-querystring/query",
>
> v, _ := query.Values(opt)
> fmt.Print(v.Encode()) // will output: "name=xxx&age=10"
>
>
>
This still sounds very much like the XY Problem <http://xyproblem.info/>.
If you goal is really to combine two structs for the purpose of encoding
them using the net/url Value type, then the using reflection to create a
new type is probably overly complicated and inefficient. A much simpler,
and more idiomatic, way to achieve the same result would be to merege the
url.Value's created from two calls to query.Values(). Something like:
package main
import "fmt"
import "github.com/google/go-querystring/query"
type A struct{ Name string }
type B struct{ Age int }
func main() {
a := A{Name: "foo"}
b := B{Age: 7}
va, _ := query.Values(a)
vb, _ := query.Values(b)
for k, vslice := range vb {
fmt.Println("Key: ", k, "Value: ", vslice)
for _, v := range vslice {
va.Add(k, v)
}
}
fmt.Print(va.Encode())
}
This is just an example, and the combining logic could be pulled out into a
general function.
If on the other hand, you have a situation where you are passing an
interface{} to code *over which you have no control*, then reflection *may *be
the best way. However, you should probably refernce the specific code (over
which you have no control) so others could help find a possible solution
based on you actual problem.
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