How to print the value of a key containing dots

Question

I\'m trying to print the values of a map, whose keys have a dot (.) on it.

Example map:

type TemplateData struct {
    Data map[string] int
         


        

Answer 1

As fabrizioM has stated, it's against the specs of the package, however there's nothing stopping you creating your own accessor to use dot notation using a function map:

package main

import (
    "fmt"
    "html/template"
    "os"
)

type TemplateData struct {
    Data map[string]int
}

var funcMap = template.FuncMap{
    "dotNotation": dotNotation,
}

func main() {
    data := TemplateData{map[string]int{"core.value": 1, "test": 100}}

    t, err := template.New("foo").Funcs(funcMap).Parse(`{{dotNotation .Data "core.value"}}`)

    if err != nil {
        fmt.Println(err)
    }

    err = t.Execute(os.Stdout, data)

    if err != nil {
        fmt.Println(err)
    }
}

func dotNotation(m map[string]int, key string) int {
    // Obviously you'll need to validate existence / nil map
    return m[key]
}

http://play.golang.org/p/-rlKFx3Ayt