How to convert associative array to key:value?

问题

I need to convert associative array, to put them to Json, but I can't understanf how to do it. Method to!string add unnecessary slashes.

int[string] name;
name["Python"] = 5;
Json tags = Json.emptyObject; //Json object
tags["tags"] = name.to!string;
writeln(tags);

{"tags":"[\"Python\":1]"}

I need to get: {"tags":{"Python":1}}

Also I am thinking about using tuples so if there is any solution for them I would like to look at it.

回答1:

to!string is the wrong approach. You don't want to convert to a generic string, but to JSON.

My first idea would be tags["tags"] = name;. But vibe.d's JSON doesn't seem to have an opAssign that takes a generic associative array.

Second idea, loop over name and assign its items to tags["name"]:

import vibe.data.json;
import std.stdio;

void main()
{
    int[string] name;
    name["Python"] = 5;
    Json tags = Json.emptyObject; //Json object

    tags["tags"] = Json.emptyObject;
    foreach (k, v; name) tags["tags"][k] = v;

    writeln(tags);
}

来源：https://stackoverflow.com/questions/32680906/how-to-convert-associative-array-to-keyvalue