Add Fast JSON Api

Gemfile

@@ -8,6 +8,7 @@ gem "grape"
 gem "grape-active_model_serializers"
 gem "grape-swagger"
 gem "grape-swagger-rails"
+gem "grape_fast_jsonapi"
 gem "jbuilder", "~> 2.5"
 gem "pg", ">= 0.18", "< 2.0"
 gem "puma", "~> 3.11"

Gemfile.lock

@@ -112,6 +112,8 @@ GEM
     equalizer (0.0.11)
     erubi (1.7.1)
     execjs (2.7.0)
+    fast_jsonapi (1.5)
+      activesupport (>= 4.2)
     ffi (1.9.25)
     globalid (0.4.1)
       activesupport (>= 4.2.0)
@@ -129,6 +131,9 @@ GEM
       grape (>= 0.16.2)
     grape-swagger-rails (0.3.0)
       railties (>= 3.2.12)
+    grape_fast_jsonapi (0.1.0)
+      fast_jsonapi
+      grape
     haml (5.0.4)
       temple (>= 0.8.0)
       tilt
@@ -325,6 +330,7 @@ DEPENDENCIES
   grape-active_model_serializers
   grape-swagger
   grape-swagger-rails
+  grape_fast_jsonapi
   haml-lint
   jbuilder (~> 2.5)
   letter_opener_web

app/controllers/api/v1/defaults.rb

@@ -9,7 +9,7 @@ module Defaults
         default_format :json
         format :json
         formatter :json,
-                  Grape::Formatter::ActiveModelSerializers
+                  Grape::Formatter::FastJsonapi
 
         helpers do
           def permitted_params

app/serializers/user_serializer.rb

@@ -1,4 +1,5 @@
-class UserSerializer < ActiveModel::Serializer
+class UserSerializer
+  include FastJsonapi::ObjectSerializer
   attributes :id, :username, :email, :last_seen,
              :last_sign_in_ip, :sign_in_count,
              :created_at, :updated_at