Using JBuilder (Ruby), how to create an array of hashes

Question

I am using JBuilder Ruby, and I want to create a JSON hash that looks like this, as an end result:

"must" : {
   "ids" : {
       "values" : [1,2]
   },
   "range" : {
       "visits" : 
         {
           "gte" : 10
         }

   }
}

Keep in mind I have no existing array to iterate over. All the examples I've looked at assume I have an array. I don't. I want to create this JSON on the fly.

I have no input, that's what I mean when I say I have no existing array. I want to create this JSON on the fly. I have zero objects. Assume I have a blank slate to work with and I want to create a JSON response that looks exactly like the one I pasted above, with hard-coded values. — Henley Wing Chiu
– Henley Wing Chiu, Commented Jul 9, 2015 at 15:19

fny · Accepted Answer · 2015-07-10 01:47:00Z

1

I don't recommend using Jbuilder for static data. The whole point of Jbuilder is to provide a DSL for converting complex object graphs into JSON. In this case, you might as well just convert a Ruby hash into JSON directly:

require 'json' # You'll need some type of JSON library which provides `Hash#to_json`
{
  must: {
    ids: {
      values: [1, 2]
    },
    range: {
      visits: {
        gte: 10
      }
    }
  }
}.to_json

For learning's sake, here's how you'd build the same JSON string with Jbuilder manually:

json = Jbuilder.new

json.set! :object do
  json.set! :must do
    json.set! :ids, [1, 2]
  end
  json.set! :range do
    json.set! :visits do
      json.set! :gte, 10
    end
  end
end.to_json # Note that Jbuilder even returns a Hash that need to be converted

edited Jul 10, 2015 at 1:47

answered Jul 9, 2015 at 15:27

fny

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