Appending to JSON array in Ruby

Question

I am looking to append to a JSON array in ruby. The JSON array looks like this:

{"data" : [{"name":"Chris","long":10,"lat":19}, {"name":"Scott","long":9,"lat":18}]}

I want to be able to append another object to this array e.g

{"name":"John","long":20,"lat":45}

How can I do this?

Saravanan · Accepted Answer · 2014-04-01 19:20:02Z

10

First convert the JSON to a Ruby hash this way:

require 'json'
rb_hash = JSON.parse('<your json>');
rb_hash["data"] << { name: "John", long: 20, lat: 45 }

rb_hash.to_json

edited Apr 1, 2014 at 19:20

answered Apr 1, 2014 at 18:18

Saravanan

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11 Comments

user456814 Over a year ago

You can't put the keys of a hash in strings in Ruby, not unless you use the fat arrow =>. Your code won't parse. You can fix it by using { name: "John", long: 20, lat: 45 }, or { "name" => "John", "long" => 20, "lat" => 45 }.

Saravanan Over a year ago

you can't define json like that in ruby. it will give sytax error. it should be as string. if it is a string, JSON.parse will work.

Cj1m Over a year ago

Wait, how do I then write it to the file?

user456814 Over a year ago

@user1614998 I don't mean in the call to JSON.parse, I mean where you append to the array. I tested it out using Ruby 1.9.3 and it works like the way I said, it won't work the way you had it originally.

Saravanan Over a year ago

@Cj1m try JSON.parse(File.open('<file_path>').read) to read json

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S.Yadav · Accepted Answer · 2019-09-03 06:36:34Z

2

If you want to append existing hash, we can do as below-

hash = {}

I have another hash as-

sub_hash = {}

then-

hash.merge!(sub_hash)

will work great!!!

answered Sep 3, 2019 at 6:36

S.Yadav

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