Ruby get values from nested json response by using the json gem

Question

I have a json response like this:

@response = {"result":{"amount":0.0}}

How can I get the value of amount into a variable?

I've tried:

@response['result']['amount']
@response['result'][0] 
@response[0][0]

I'm using the json gem.

I get syntax error with this @response = {"result":{"amount":0.0}} — Jagdeep Singh
– Jagdeep Singh, Commented Dec 14, 2017 at 11:16
You can indeed use bracket notation [] to access values from a json response. Just check all the available keys that can be passed into [] by calling @response.keys. — Jagdeep Singh
– Jagdeep Singh, Commented Dec 14, 2017 at 11:17

Abdullah · Accepted Answer · 2017-12-14 11:21:53Z

1

Try this

@response[:result][:amount]

the keys in @response object are :symbols not strings

For more info: What's the difference between a string and a symbol in Ruby?

edited Dec 14, 2017 at 11:21

answered Dec 14, 2017 at 11:12

Abdullah

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Comments

Lauri · Accepted Answer · 2017-12-14 12:14:06Z

1

With nested Hashes Ruby's Hash#dig method is very handy since it is returning nil if any intermediate step is nil.

@response.dig(:result, :amount)

If you are not sure is the key string or symbol you can use ActiveSupport::HashWithIndifferentAccess that provides Hash#with_indifferent_access (Rails will include this by default). Then you can get the value with both symbol and string formatted key.

answered Dec 14, 2017 at 12:14

Lauri

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