Rails render object in json with model associations

Question

I'm trying to render the user model along with the posts model, but I'm having trouble figuring out what the syntax for it would be

class Post < ApplicationRecord
   belongs_to :user
end

class User < ApplicationRecord
   has_many :posts, dependent: :destroy
end

Controller

  def map_locations
    @posts = Post.where.not(location: [nil, ""])
    render :json => @posts.as_json(only: [:topic, :location, :latitude, :longitude],)
  end

Output:

[{"topic":"Garret ATX","location":"Hornitos, CA, USA","latitude":37.5021592,"longitude":-120.238241}]

Desired Output:

[{"user_name":"Randy","topic":"Garret ATX","location":"Hornitos, CA, USA","latitude":37.5021592,"longitude":-120.238241}

The user model has @user.user_name which is the one I need for each post. How do I render the user associated with each post?

Satishakumar Awati · Accepted Answer · 2018-03-12 05:33:34Z

2

I hope this works

def map_locations
  @posts = Post.where.not(location: [nil, ""])
  render :json => @posts.as_json(:only => [:topic, :location, :latitude, :longitude], :include => {:user => {:only => :user_name}})
end

Please check the apidock for more details.

answered Mar 12, 2018 at 5:33

Satishakumar Awati

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