Active record preload

Gemfile

@@ -12,6 +12,7 @@ gem 'puma', '~> 3.0'
 # Use GraphQL!
 gem 'graphql', github: 'rmosolgo/graphql-ruby', ref: 'a655714240c59e86c84bb22b82d776be02eddb8f'
 gem 'graphql-batch'
+gem 'graphql-active_record_batcher'
 # GraphiQL Interface
 gem 'graphiql-rails', '~> 1.4.1'
 

Gemfile.lock

@@ -58,11 +58,15 @@ GEM
       activesupport (>= 4.1.0)
     graphiql-rails (1.4.1)
       rails
+    graphql-active_record_batcher (0.3.1)
+      activerecord
+      graphql
+      graphql-batch
+      promise.rb
     graphql-batch (0.3.1)
       graphql (>= 0.8, < 2)
       promise.rb (~> 0.7.2)
     i18n (0.8.0)
-    json (2.0.2)
     listen (3.0.8)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
@@ -129,9 +133,8 @@ GEM
     thread_safe (0.3.5)
     tzinfo (1.2.2)
       thread_safe (~> 0.1)
-    uglifier (2.7.2)
-      execjs (>= 0.3.0)
-      json (>= 1.8.0)
+    uglifier (3.0.4)
+      execjs (>= 0.3.0, < 3)
     web-console (3.4.0)
       actionview (>= 5.0)
       activemodel (>= 5.0)
@@ -149,6 +152,7 @@ DEPENDENCIES
   byebug
   graphiql-rails (~> 1.4.1)
   graphql!
+  graphql-active_record_batcher
   graphql-batch
   listen (~> 3.0.5)
   pg
@@ -162,4 +166,4 @@ DEPENDENCIES
   web-console (>= 3.3.0)
 
 BUNDLED WITH
-   1.14.3
+   1.14.4

app/models/graph/schema.rb

@@ -1,5 +1,7 @@
 module Graph
   Schema = GraphQL::Schema.define do
+    enable_active_record_batching
+
     query Graph::Types::Query
     mutation Graph::Mutations::Mutation
 
@@ -23,8 +25,5 @@ module Graph
       model = Object.const_get(gid.model_name)
       Graph::FindLoader.for(model).load(gid.model_id.to_i)
     end
-
-    lazy_resolve(Promise, :sync)
-    instrument(:query, GraphQL::Batch::Setup)
   end
 end

app/models/graph/types/person.rb

@@ -3,6 +3,7 @@ module Types
     Person = GraphQL::ObjectType.define do
       name "Person"
       description "An individual person or character within the Star Wars universe."
+      model ::Person
 
       interfaces [GraphQL::Relay::Node.interface]
 
@@ -33,11 +34,15 @@ module Types
         property: :hair_color
 
       field :height, types.Int, "The height of the person in centimeters."
+
       field :homeworld, Planet, "A planet that this person was born on or inhabits." do
-        resolve -> (person, _, _) do
-          Graph::AssociationLoader.for(::Person, :homeworld).load(person)
-        end
+        preloads :homeworld
+      end
+
+      field :species, Species, "The species of this person." do
+        preloads :species
       end
+
       field :mass, types.Int, "The mass of the person in kilograms."
       field :name, !types.String, "The name of this person."
       field :skinColor, types.String, "The skin color of this person.", property: :skin_color

app/models/graph/types/rating.rb

@@ -3,11 +3,18 @@ module Types
     Rating = GraphQL::ObjectType.define do
       name "Rating"
       description "A rating made by a user on a film."
+      model ::Rating
 
       interfaces [GraphQL::Relay::Node.interface]
 
-      field :user, !Graph::Types::User, "The critic."
-      field :film, !Graph::Types::Film, "The rated film."
+      field :user, !Graph::Types::User, "The critic." do
+        preloads :user
+      end
+
+      field :film, !Graph::Types::Film, "The rated film." do
+        preloads :film
+      end
+
       field :rating, !types.Int, "A film rating from 0 to 5."
       field :createdAt, !types.String,
         "The ISO 8601 date format of the time that this resource was created.", property: :created_at

app/models/graph/types/species.rb

@@ -3,6 +3,7 @@ module Types
     Species = GraphQL::ObjectType.define do
       name "Species"
       description "A type of person or character within the Star Wars Universe."
+      model ::Species
 
       interfaces [GraphQL::Relay::Node.interface]
 
@@ -51,9 +52,7 @@ module Types
 
       field :language, types.String, "The language commonly spoken by this species."
       field :homeworld, Graph::Types::Planet, "A planet that this species originates from type." do
-        resolve -> (species, _, _) do
-          Graph::AssociationLoader.for(::Species, :homeworld).load(species)
-        end
+        preloads :homeworld
       end
     end
   end

db/schema.graphql

@@ -284,6 +284,9 @@ type Person implements Node {
   # A planet that this person was born on or inhabits.
   homeworld: Planet
 
+  # The species of this person.
+  species: Species
+
   # The mass of the person in kilograms.
   mass: Int