How to add new key/value pair to existing JSON object in Ruby -

how append new key/value pair existing json object in ruby?

my output is

{     "2d967df3-ee07-4e40-8f65-7bbff59bbb7e": {         "name": "book1",         "author": "author1"     } } 

i want achieve when add new key/value pair

{     "2d967df3-ee07-4e40-8f65-7bbff59bbb7e": {         "name": "book1",         "author": "author1"     },     "c55a3632-9bed-4a41-ae40-c1abfe0f332a": {         "name": "book2",         "author": "author2"     } } 

method write json file

def create_book(name, author)     temphash = {         securerandom.uuid => {             "name" => name,             "author" => author             }     }      file.open("./books/book.json","w") |f|       f.write(json.pretty_generate(temphash))     end end 

how append new key/value pair existing json object in ruby?

if want add existing file should read json first, extract data it, add new hash array. maybe solve problem:

def create_book(name, author)   temphash = {   securerandom.uuid => {     "name" => name,     "author" => author     }   }    data_from_json = json[file.read("./books/book.json")]   data_from_json = [data_from_json] if data_from_json.class != array   file.open("./books/book.json","w") |f|     f.write(json.pretty_generate(data_from_json << temphash))   end end 

there other ways manipulating json common string safety should extract data , create new json one.