How to add key/value pair in hash with ruby laungage - ruby

Question

I am using ruby 2.0.0, At present i have one demo.json file with following hash values:
{
"users":
{
"#jon" :
{
"name": "pradeep",
"Email": "pradeep#yahoo.com",
"area": "#jon",
"location": "#newyork"
},
"#smith" :
{
"name": "Smith",
"Email": "Joe#yahoo.com",
"area": "#smith",
"location": "#lverginia"
}
}
}
now i am taking json values in object using following codes:
require 'json'
json = File.read('demo.json')
obj = JSON.parse(json)
here #jon and #smith is usernames, Now i wants to take usernames via keyboard inputs and than all the other values inside of #jon with same keyboard.
Suppose i have one new user #david and his other values are like:
"name": "pradeep",
"Email": "pradeep#yahoo.com",
"area": "#jon",
"location": "#newyork"
i wants to add this in above demo.json file without remove other values, Any idea how can i do?
I tried to do this in this way:
obj["users"]
But as i got username via input so i cant hard code username after user key on "obj" object, Hope this make sense..

Answer 1

Read this JSON also .
I'd do as below :
require 'json'
json = JSON.parse(File.read("test.json"))
new_information_arry = ["users", "name", "Email", "area", "location"].map do |elem|
puts "please give the value of #{elem}"
[elem,gets.chomp]
end
new_information_hash = Hash[new_information_arry[1..-1]]
json['users'][new_information_arry.first.last] = new_information_hash
File.write("outputfile.json",JSON.pretty_generate(json))
I put the below content to my file 'test.json' :
{
"users":
{
"#jon" :
{
"name": "pradeep",
"Email": "pradeep#yahoo.com",
"area": "#jon",
"location": "#newyork"
},
"#smith" :
{
"name": "Smith",
"Email": "Joe#yahoo.com",
"area": "#smith",
"location": "#lverginia"
}
}
}
Then I ran the above code as below :
please give the value of users
#david
please give the value of name
pradeep
please give the value of Email
pradeep#yahoo.com
please give the value of area
#jon
please give the value of location
#newyor
And now my output file outputfile.json contains :
{
"users": {
"#jon": {
"name": "pradeep",
"Email": "pradeep#yahoo.com",
"area": "#jon",
"location": "#newyork"
},
"#smith": {
"name": "Smith",
"Email": "Joe#yahoo.com",
"area": "#smith",
"location": "#lverginia"
},
"#david": {
"name": "pradeep",
"Email": "pradeep#yahoo.com",
"area": "#jon",
"location": "#newyor"
}
}
}