(Ruby) JSON: Nested Objects

Here we have a JSON object that contains nested JSON objects. This example demonstrates how to access the contents of the nested objects.

{
  "name": "donut",
  "image":
    {
    "fname": "donut.jpg",
    "w": 200,
    "h": 200
    },
  "thumbnail":
    {
    "fname": "donutThumb.jpg",
    "w": 32,
    "h": 32
    }
}

Chilkat Ruby Downloads Ruby Library for Linux and MAC OS X

require 'chilkat'

json = Chilkat::CkJsonObject.new()

#  This is the above JSON with whitespace chars removed (SPACE, TAB, CR, and LF chars).
#  The presence of whitespace chars for pretty-printing makes no difference to the Load
#  method.
jsonStr = "{\"name\": \"donut\",\"image\":{\"fname\": \"donut.jpg\",\"w\": 200,\"h\": 200},\"thumbnail\":{\"fname\": \"donutThumb.jpg\",\"w\": 32,\"h\": 32}}"

success = json.Load(jsonStr)
if (success != true)
    print json.lastErrorText() + "\n";
    exit
end

#  Get the "image" object.
# imageObj is a CkJsonObject
imageObj = json.ObjectOf("image")
if (imageObj == nil )
    print "image object not found." + "\n";
    exit
end

print "image: fname=" + imageObj.stringOf("fname") + ", width=" + imageObj.IntOf("w").to_s() + ", height=" + 
    imageObj.IntOf("h").to_s() + "\n";

#  Get the "thumbnail" object.
# thumbObj is a CkJsonObject
thumbObj = json.ObjectOf("thumbnail")
if (thumbObj == nil )
    print "thumbnail object not found." + "\n";
    exit
end

print "thumbnail: fname=" + thumbObj.stringOf("fname") + ", width=" + thumbObj.IntOf("w").to_s() + ", height=" + 
    thumbObj.IntOf("h").to_s() + "\n";