Adding multiple objects to json file with ruby

Question

I'm trying to get daily values from google rate exchange API (http://rate-exchange.appspot.com/currency?from=USD&to=EUR) and write the values to a JSON file. What I have so far is:

quote = agent.get("http://rate-exchange.appspot.com/currency?from=USD&to=EUR").body
parsed = JSON.parse(quote)
stored = {:date => Time.now, :rate => parsed['rate']}
File.open("ruby_test.json", "w") { |f| f.write(JSON.pretty_generate(stored)) }

But this will overwrite my json file everytime I run it, the error is the way I am creating the ruby hash or the way I'm writing the json file?

infused · Accepted Answer · 2014-08-19 21:50:50Z

1

To append to the file, open it with a file open mode of a instead of w:

File.open("ruby_test.json", "a") { |f| f.write(JSON.pretty_generate(stored)) }

answered Aug 19, 2014 at 21:50

infused

24.5k13 gold badges71 silver badges80 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Cássio Godinho Over a year ago

But this will give me an invalid json file, I think this way I'm just appending two strings together

Collectives™ on Stack Overflow

Adding multiple objects to json file with ruby

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related