Today I Learned

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Serialize With fast_jsonapi In A Rails App

Netflix put out a Ruby gem for super fast JSON serialization — fast_jsonapi. It is great for serializing JSON responses for Rails API endpoints.

First, add gem 'fast_jsonapi' to your Gemfile and bundle install.

Then create the app/serializers directory for housing all of your JSON serializers.

Next you can create a serializer that corresponds to the model you want to serialize:

# app/serializers/recipe_serializer.rb
class RecipeSerializer
  include FastJsonapi::ObjectSerializer

  set_id :id
  attributes :name, :source_url
end

Last, use it to generate a JSON response in your controller:

# app/controllers/recipes_controller.rb
class RecipesController < ApiController
  def index
    render json: RecipeSerializer.new(@current_user.recipes)
  end
end

Requests to that endpoint will receive a response that looks something like this:

{
  data: [
    {
      id: 1,
      attributes: { name: "Old Fashioned", source_url: "http://..." },
    },
    {
      id: 2,
      attributes: { name: "Sazerac", source_url: "http://..." },
    },
  ]
}
Looking for help? Hashrocket has been an industry leader in Ruby on Rails since 2008. Rails is a core skill for each developer at Hashrocket and we'd love to take a look at your project. Contact us and find out how we can help you.