Add values to Ruby JSON Object

Question

I am working on Ruby on Rails. I have JSON object like this in my database:

{"data":[
    {"name":"A", "available":"1"},
    {"name":"B", "available":"0"}
]}

I want to update this by adding another record and it should look like:

{"data":[
        {"name":"A", "available":"1"},
        {"name":"B", "available":"0"},
        {"name":"C","available":"1"}
    ]}

How can I do this?

The other record I am creating based on user input in my website. — Sonali Gupta
– Sonali Gupta, Commented Mar 15, 2016 at 13:01
Is there any thing special about this object? I think this is just a basic array and hash manipulation which you know already if you have used Ruby for a while. You mention "database" and I think you might want to do something with it — The Lazy Log
– The Lazy Log, Commented Mar 15, 2016 at 13:02

Rohit Jangid · Accepted Answer · 2016-03-15 12:59:58Z

8

You could try this

json = { "data" => [
         {"name" => "A", "available" => "1"},
         {"name" => "B", "available" => "0"}
       ]}
json["data"].push({"name" => "C", "available" => "1"})

answered Mar 15, 2016 at 12:59

Rohit Jangid

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Abhishek Patel · Accepted Answer · 2016-03-15 13:27:50Z

0

If you are using ActiveRecord Serialize(Or Rails 5 attribute api), The the value will already be converted to hash.

class Model
 serialize :some_field, JSON
end

record = Model.find(id)

record.some_field ==>
{"data":[
    {"name":"A", "available":"1"},
    {"name":"B", "available":"0"}
]}

record.some_field["data"] << {"name" => "C", "available" => "1"}
record.save

answered Mar 15, 2016 at 13:27

Abhishek Patel

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