How to avoid repetition when defining this nested map

In one of my json schema, I have a map like this

var deviceSchemaJson = map[string]interface{}{
	"additionalProperties": false,
	"properties": map[string]interface{}{
		"application": map[string]string{
			"type": "string",
		},
		"hostname": map[string]string{
			"type": "string",
		},
		"ipaddress": map[string]interface{}{
			"oneOf": []map[string]string{{"format": "ipv4"},{"format": "ipv6"}},
			"type": "string",
		},
		"kernel_version": map[string]string{
			"type": "string",
		},
	},
	"type": "object",
}

How can I avoid defining map[string]string every time?

try this if that suites you better

package main

import (
	"fmt"
)

func main() {
	fmt.Printf("%#v\n",deviceSchemaJson)
}

var deviceSchemaJson = value{
	"additionalProperties": false,
	"properties": value{
		"application": value{
			"type": "string",
		},
		"hostname": value{
			"type": "string",
		},
		"ipaddress": value{
			"oneOf": []valuestring{{"format": "ipv4"}, {"format": "ipv6"}},
			"type":  "string",
		},
		"kernel_version": valuestring{
			"type": "string",
		},
	},
	"type": "object",
}

type value map[string]interface{}

type valuestring map[string]string

https://play.golang.org/p/6Kq5pvXYvNm

> How can I avoid defining map[string]string every time?

By defining types which represent your data structure.

type DeviceSchema struct {
	AdditionalProperties bool
	Properties Properties
	Type string
}

type Properties struct {
	Application string
	Hostname string
	IpAddress []map[string]string
	KernelVersion string
}

func main() {
	deviceSchemaData := DeviceSchema{
		AdditionalProperties: false,
		Properties: Properties{
			IpAddress: []map[string]string{{"format": "ipv4"},{"format": "ipv6"}},
		},
		Type: "object",
	}
	fmt.Println(deviceSchemaData)
}

https://play.golang.org/p/iHfoft1zyAn

One way to simplify the definition would be:

func stringMap(s...string) map[string]string {
  ret:=map[string]string{}
  for i:=0; i<len(s);i+=2 {
     ret
展开收缩
]=s[i+1]
  }
  return ret
}

var deviceSchemaJson = map[string]interface{}{
    "additionalProperties": false,
    "properties": map[string]interface{}{
        "application": stringMap("type","string"),
        "hostname": stringMap("type","string"),
        "ipaddress": map[string]interface{}{
            "oneOf": []map[string]string{stringMap("format","ipv4"),stringMap("format","ipv6")},
            "type": "string",
        },
        "kernel_version": stringMap("type","string"),
    },
    "type": "object",
}

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