Merging and manipulating JSON arrays in ruby

Question

In my model i'm getting two Json arrays from both the facebook's and twitter's api.

facebook_friends = { "data": 
  [{"name": "Friend Joe", "id": "123"}, 
   {"name": "Friend Jane", "id": "12342"}]}
twitter_friends = { "users": 
  [{"name": "Other friend joe", "id": "333"}, 
   {"name": "Other friend Jane", "id": "456"}]}

And I want to build an array like this (NB: i'm appending the provider key to identify the source of the data)

all_friends = [
  {"name": "Friend Joe", "id": "123", "provider": "facebook"},
  {"name": "Friend Jane", "id": "12342", "provider": "facebook"}, 
  {"name": "Other friend joe", "id": "333", "provider": "twitter"},
  {"name": "Other friend Jane", "id": "456", "provider": "twitter"}]

I can do this with jquery like this -> http://jsfiddle.net/gm3jJ/ but how do i do it in ruby?
Thanks

acsmith · Accepted Answer · 2014-06-21 19:32:28Z

1

If you want to combine stuff, you can just do it like this:

# Get the array of friends from each service and add provider
fb = JSON.parse(facebook_friends)["data"].map {|x| x["provider"] = "facebook"}
tw = JSON.parse(twitter_friends)["users"].map {|x| x["provider"] = "twitter"}
# Concatenate them into one array
fb + tw

answered Jun 21, 2014 at 19:32

acsmith

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sidney · Accepted Answer · 2014-06-21 19:41:40Z

1

You can do this using those lines:

facebook_array = JSON.parse('{ "data": [{"name": "Friend Joe", "id": "123"}, {"name": "Friend Jane", "id": "12342"}]}')["data"].map{|h| h.merge({'provider' => 'facebook'})}
twitter_array = (JSON.parse('[{"name": "Other friend joe", "id": "333"}, {"name": "Other friend Jane", "id": "456"}]').map{|h| h.merge({'provider' => 'twitter'})})
final_array = facebook_array.concat(twitter_array)

Edit: Don't forget to require json, like this before executing the above code: require 'json'

edited Jun 21, 2014 at 19:41

answered Jun 21, 2014 at 19:29

sidney

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3 Comments

Saff Over a year ago

Thanks, is final_array a json array?

sidney Over a year ago

no, it isn't a json array, it is a ruby array. You can get a json array back by doing final_array.to_json, and it will be yours :)

sidney Over a year ago

All the pleasure is mine Don't forget to click on "accepted answer" on the left of my answer please :-)

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