重复formData to Go结构

Question

I am submitting a repeating form, where the resulting formData is parsed as:

"Name":  {"John", "Jake"},
"Phone": {"999-999-999", "12312-123-123"}, 

However, I want to structure to be

{ Name: "John", Phone: "999-999-999" }, 
{ Name: "Jake", Phone: "12312-123-123" }.

I'm told gorilla/schema, is a good fit, but I tried it below and it produces an empty slice. Is there something I am missing?

package main

import (
        "fmt"

        "github.com/gorilla/schema"
)

type Person struct {
        Name  string
        Phone string
}

func main() {
        values := map[string][]string{
                "Name":  {"John", "Jake"},
                "Phone": {"999-999-999", "12312-123-123"},
        }
        var persons []Person
        decoder := schema.NewDecoder()
        decoder.Decode(persons, values)
        fmt.Println(persons)
}

Answer 1

In your provided data of json each key contains two values. That's the reason behind empty slices. Use slice of string in your struct to unmarshal the value.

package main

import (
    "fmt"

    "github.com/gorilla/schema"
)

type Person struct {
    Name  []string // this should be a slice since the key contains multiple values
    Phone []string
}

type Person2 struct {
    Name  string
    Phone string
}

func main() {
    values := map[string][]string{
        "Name":  {"John", "Jake"},
        "Phone": {"999-999-999", "12312-123-123"},
    }
    person := new(Person)
    decoder := schema.NewDecoder()
    decoder.Decode(person, values)
    fmt.Println(person)
}

Output:

&{[John Jake] [999-999-999 12312-123-123]}

For required structure

{ Name: "John", Phone: "999-999-999" }, 
{ Name: "Jake", Phone: "12312-123-123" }

Edited:

Process the data coming from form to change the format of your structure.

type Person2 struct {
    Name  string
    Phone string
}

func processData(person *Person) {
    var result []Person2
    var person2 Person2
    for i := 0; i < len(person.Name); i++ {
        person2.Name = person.Name[i]
        person2.Phone = person.Phone[i]
        result = append(result, person2)
    }
    fmt.Printf("%#v
", result)
}

Output:

[]stack.Person2{stack.Person2{Name:"John", Phone:"999-999-999"}, stack.Person2{Name:"Jake", Phone:"12312-123-123"}}

Playground Example to process the data

As @Adrain suggested it is better to use some kind of indexing with the field names for the form. It is also provided in gorilla/schema package to name the values with indexes for saving multiple records.

<form>
    <input type="text" name="Name">
    <input type="text" name="Phones.0.Label">
    <input type="text" name="Phones.0.Number">
    <input type="text" name="Phones.1.Label">
    <input type="text" name="Phones.1.Number">
    <input type="text" name="Phones.2.Label">
    <input type="text" name="Phones.2.Number">
</form>

Above form can be parsed to below struct which contains a slice of Phone:

type Person struct {
    Name   string
    Phones []Phone
}