rails: how to include additional fields in json response

Question

I am using acts_as_follower in my rails application so that a user can follow a book. My controller is given below. I also have a current_user method.

I want to add an additional field "isFolowing" to the pages response ,This is to check if the current user is following that particular page or not. acts_as_follower gem provides a method user.following?(book) to check if a user is following a particular book.

Please help me to add this additional field "isFollowing" to the response

class BooksController < ApplicationController
   def index
       @books=Book.all
       render json: @books
   end
end

if you want to have isFollowing in response, render json: {isFollowing: current_user.isFollowing?(book)}. — Saravanan
– Saravanan, Commented Dec 14, 2014 at 17:06
Saravanan, I want to see isFollowing for each of the books in the index action response — Kallan
– Kallan, Commented Dec 14, 2014 at 17:27

Saravanan · Accepted Answer · 2014-12-14 18:01:10Z

3

I think, you need to have a method in Book class,

def attributes_with_following_flag(user)
     as_json.merge({is_following: user.is_following(this)})
end

And in controller,

 render json: @books.collect{|b| b.attributes_with_following_flag(current_user)}

edited Dec 14, 2014 at 18:01

answered Dec 14, 2014 at 17:51

Saravanan

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4 Comments

Prakash Murthy Over a year ago

In the controller method, it should be current_user instead of user

Kallan Over a year ago

thanks a lot for reply @Saravanan .but the user.following?(book) method provided by the gem acts_as_follower is only working if you call from controller and not inside the model. is there anyway we can do this using the "joins" and "includes"

Saravanan Over a year ago

act_as_follower also provides, book.followed_by? method.

Kallan Over a year ago

Sorry about the confusion @Saravanan your code is right. i wasnt getting current user in my controller. fixed it. :)

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