How to properly create JSON with variables?

Question

I have several variables, not literals, that I want include in a json string. This doesn't work:

a1 = get_email
a2 = get_user_name

json1 = '{"email": a1, "username": a2}'

because the variables aren't evaluated.

And doing this the other way around will make json invalid because single quotation marks aren't allowed in json:

a1 = get_email
a2 = get_user_name

json1 = "{'email': a1, 'username': a2}"

How can I create a json with those variables?

Possible duplicate of [How to convert a ruby hash object to JSON?](https://stackoverflow.com/questions/3183786/how-to-convert-a-ruby-hash-object-to-json) — David Maze, Aug 02 '18 at 02:04
You can create the hash with the a's values, `{email: a1, ...}`. Try that. — Sebastián Palma, Aug 02 '18 at 02:15

score 6 · Answer 1 · answered Aug 02 '18 at 03:34

6

Easiest way to do this is to first use a hash:

a1 = get_email
a2 = get_user_name

json1 = {'email'=> a1, 'username'=> a2}.to_json

answered Aug 02 '18 at 03:34

adrienbourgeois

score 2 · Answer 2 · answered Aug 02 '18 at 03:40

2

Using to_json as in adrienbourgeois's answer is the correct way after all, but going along the lines of what you suggested, you should have done:

json1 = "{\"email\": #{a1}, \"username\": #{a2}}"

provided that a1.to_s and a2.to_s give the JSON format of whatever object you have in it (which you have not made clear in your question).

answered Aug 02 '18 at 03:40

sawa

2 Answers2