Question

I am new to rails. I have two models users and languages and i have list of languages in language model.

class User < ActiveRecord::Base
 has_and_belongs_to_many :languages

and

class Language < ActiveRecord::Base
 has_and_belongs_to_many :users

I have two questions :

• how can i add an existing language to a user’s language list ?
• how can i include the languages into the user’s json representation ?

I do not have any form i use curl to post and receive json as response as shown below :

curl -H ‘Content-Type: application/json’ -H ‘Accept:
application/json’ -X GET htt://localhost:3000/profile.json -d “{
“auth_token” : “teafa52qsasTDGaahawa” }”

Please help me. Thanks in advance.

Answer 1

use @user.languages << @languages_to_add to create the records needed in the join table when updating your record.

use @user.to_json( include: :languages ) in your controller to include the languages in your JSON response.