CODEWITHSUNDEEP
ruby-on-railsrubyjsonapiruby-grape
Big_Bird
Big_Bird

Reputation: 427

Grape API gem: How to display associated Models as nested JSON

I'm currently building a API to access all posts on a blog for a specific owner. I'd like to display them as nested json under the Blog model.

class API < Grape::API
format :json
prefix "api"
resource "posts" do
  get ':id' do
    owner = Owner.find(params[:id])
    present owner.blogs.each do |b|
        present b
        b.posts.each do  |p|
            present p
        end
    end
  end
end
end

It's safe to assume that a Owner has many blogs & in turn has many posts.

source: https://github.com/intridea/grape

Upvotes: 1

Views: 3613

Answers (1)

zeroed
zeroed

Reputation: 548

Maybe you could find useful the grape-entity gem: https://github.com/intridea/grape-entity

With that you can define a "nested entity" for your model:

module YourApp
  module Entities
    class Blog < Grape::Entity
      expose :id, :blog_title
      expose :posts, using: YourApp::Entities::Post
    end

    class Post < Grape::Entity
      expose :id, :post_title
    end
  end
end

And than, in the endpoint:

# ...
present owner.blogs, with: YourApp::Entities::Blog
# ...

I hope this helps.

Upvotes: 5

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