Go中的嵌套数据结构-等同于Python

Question

I can create this data structure in Python really easily:

data = {'Locations': [],
 'Dates': [],
 'Properties': [{'key': 'data1', 'value': 'data2'}],
 'Category': 'all'}

Which can then be marshalled to JSON in Python just as easily. e.g.

print json.dumps(data)

{"Category": "all", "Dates": [], "Locations": [], "Properties": [{"value": "data2", "key": "data1"}]}

However, I'm tearing my hair out trying to create the same structure then convert it to JSON in Go. Go looks to be very promising and just what I need for creating cross platform applications, but boy this stuff seems to be frustratingly difficult.

This is what I've tried, however I cant get the structure to include the square brackets that should surround the properties element.

import (
"fmt"
"encoding/json"
)

func main() {

data := map[string]interface{}{"Offset": "0", "Properties": map[string]string{"value": "data2", "key": "data1"}, "Category": "all", "Locations": []string{}, "Dates": []string{} }
    data_json, _ := json.Marshal(data)
fmt.Println(string(data_json))
}

Which outputs:

{"Category":"all","Dates":[],"Locations":[],"Offset":"0","Properties":{"key":"data1","value":"data2"}}

Heres a demo: http://play.golang.org/p/49Kytg6v_C

Answer 1

You just need to create a slice of map[string]string:

data := map[string]interface{}{
    "Offset":     "0",
    "Properties": []map[string]string{{"value": "data2", "key": "data1"}},
    "Category":   "all",
    "Locations":  []string{},
    "Dates":      []string{},
}

<kbd>playground</kbd>