How do you create a JSON object within a JSON array using Ruby's json_builder?

Question

How do I use Ruby's json_builder to create a JSON object within a JSON array? For example, how do I create the following structure?

{
  Object: [
    "x",
    { 
      "Foo" : "Bar" 
    },
    "y"
  ]
}

Note: these types of structures are used in AWS's Cloud Formation API

Are there any similar ruby JSON templating DSLs that can do this cleanly? — jnorris
– jnorris, Commented Feb 7, 2012 at 5:39

Garrett · Accepted Answer · 2012-06-05 06:57:46Z

4

Here is the example code needed to generate a JSON object as shown in the question.

require 'rubygems'
require 'json_builder'

json = JSONBuilder::Compiler.generate(:pretty => true) do
 Object ['x', { :Foo => 'Bar' }, 'y']
end

puts json

As the author of json_builder, let me know if you need any other help, but the README is fairly straightforward and could always use improvement if you have a hard time finding example usage.

answered Jun 5, 2012 at 6:57

Garrett

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Comments

Swanand · Accepted Answer · 2012-02-07 05:47:32Z

2

I would recommend JBuilder over json_builder. It is targeted at Rails applications, but its a Ruby gem and can be used otherwise.

The github page also has links to other json builder gems.

answered Feb 7, 2012 at 5:47

Swanand

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3 Comments

Garrett Over a year ago

Any particular reason you recommend JBuilder over json_builder? As the author of json_builder, I spent a lot of time on the API of the library and would like to think it's the simplest JSON generating library out there without sacrificing features or speed.

Swanand Over a year ago

Actually, I should have mentioned it here, I only recommended it because it was made a Rails default.

Swanand Over a year ago

Also, the API being similar to the XML builder API is a minor, but added advantage of JBuilder.

jnorris · Accepted Answer · 2012-02-07 06:15:57Z

0

Interestly, "regular" require 'json' works well as a DSL:

require 'json'

json = {
  :Object => [
    "x",
    {
      :Foo => "Bar"
    },
    "y"
  ]
}

puts JSON.pretty_generate(json)

answered Feb 7, 2012 at 6:15

jnorris

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