diff --git a/engines/dfc_provider/app/controllers/api/dfc_provider/products_controller.rb b/engines/dfc_provider/app/controllers/api/dfc_provider/products_controller.rb
index c0e24eb6f9..a3b9e2e399 100644
--- a/engines/dfc_provider/app/controllers/api/dfc_provider/products_controller.rb
+++ b/engines/dfc_provider/app/controllers/api/dfc_provider/products_controller.rb
@@ -1,26 +1,32 @@
-module Api::DfcProvider
-  class ProductsController < ActionController::Base
-    before_filter :set_enterprise
+# frozen_string_literal: true
 
-    def index
-      products = @enterprise.inventory_variants
-                            .includes(:product, :inventory_items)
+# Controller used to provide the API products for the DFC application
+module Api
+  module DfcProvider
+    class ProductsController < Api::BaseController
+      before_filter :set_enterprise
 
-      products_json = DfcProvider::ProductSerializer
-                      .new(@enterprise, products, base_url)
-                      .serialized_json
+      def index
+        products = @enterprise.
+          inventory_variants.
+          includes(:product, :inventory_items)
 
-      render json: products_json
-    end
+        products_json = ::DfcProvider::ProductSerializer.
+          new(@enterprise, products, base_url).
+          serialized_json
 
-    private
+        render json: products_json
+      end
 
-    def set_enterprise
-      @enterprise = ::Enterprise.find(params[:enterprise_id])
-    end
+      private
 
-    def base_url
-      "#{root_url}api/dfc_provider"
+      def set_enterprise
+        @enterprise = ::Enterprise.find(params[:enterprise_id])
+      end
+
+      def base_url
+        "#{root_url}api/dfc_provider"
+      end
     end
   end
 end
diff --git a/engines/dfc_provider/app/serializers/dfc_provider/product_serializer.rb b/engines/dfc_provider/app/serializers/dfc_provider/product_serializer.rb
index 1422f72f02..8bd33abed6 100644
--- a/engines/dfc_provider/app/serializers/dfc_provider/product_serializer.rb
+++ b/engines/dfc_provider/app/serializers/dfc_provider/product_serializer.rb
@@ -1,3 +1,7 @@
+# frozen_string_literal: true
+
+# Serializer used to render the products passed
+# into JSON-LD format based on DFC ontology
 module DfcProvider
   class ProductSerializer
     def initialize(enterprise, products, base_url)
@@ -9,20 +13,26 @@ module DfcProvider
     def serialized_json
       {
         "@context" =>
-          {
-            "DFC" => "http://datafoodconsortium.org/ontologies/DFC_FullModel.owl#",
-            "@base" => @base_url
-          },
-         "@id" => "/enterprises/#{@enterprise.id}/products",
-         "DFC:supplies" => @products.map do |variant|
-            {
-              "DFC:description" => variant.name,
-              "DFC:quantity" => variant.total_on_hand,
-              "@id" => variant.id,
-              "DFC:hasUnit" => {"@id" => "/unit/#{variant.unit_description.presence || 'piece' }"}
-            }
-          end
-        }.to_json
+        {
+          "DFC" => "http://datafoodconsortium.org/ontologies/DFC_FullModel.owl#",
+          "@base" => @base_url
+        },
+        "@id" => "/enterprises/#{@enterprise.id}/products",
+        "DFC:supplies" => serialized_products
+      }.to_json
+    end
+
+    private
+
+    def serialized_products
+      @products.map do |variant|
+        {
+          "DFC:description" => variant.name,
+          "DFC:quantity" => variant.total_on_hand,
+          "@id" => variant.id,
+          "DFC:hasUnit" => { "@id" => "/unit/#{variant.unit_description.presence || 'piece'}" }
+        }
+      end
     end
   end
 end
diff --git a/engines/dfc_provider/config/routes.rb b/engines/dfc_provider/config/routes.rb
index 800435932a..1d7ab6b87f 100644
--- a/engines/dfc_provider/config/routes.rb
+++ b/engines/dfc_provider/config/routes.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 DfcProvider::Engine.routes.draw do
   namespace :api do
     namespace :dfc_provider do
diff --git a/engines/dfc_provider/dfc_provider.gemspec b/engines/dfc_provider/dfc_provider.gemspec
index d14ab9db5f..4bf510bed5 100644
--- a/engines/dfc_provider/dfc_provider.gemspec
+++ b/engines/dfc_provider/dfc_provider.gemspec
@@ -1,4 +1,6 @@
-$:.push File.expand_path("../lib", __FILE__)
+# frozen_string_literal: true
+
+$LOAD_PATH.push File.expand_path('lib', __dir__)
 
 # Maintain your gem's version:
 require "dfc_provider/version"
@@ -9,7 +11,7 @@ Gem::Specification.new do |s|
   s.version     = DfcProvider::VERSION
   s.authors     = ['Admin OFF']
   s.email       = ['admin@openfoodfrance.org']
-  s.summary     = 'Provdes an API stack implementing DFC semantic specifications'
+  s.summary     = 'Provides an API stack implementing DFC semantic specifications'
 
   s.files = Dir["{app,config,db,lib}/**/*"] + ['MIT-LICENSE', 'Rakefile', 'README.rdoc']
   s.test_files = Dir['test/**/*']
diff --git a/engines/dfc_provider/lib/dfc_provider.rb b/engines/dfc_provider/lib/dfc_provider.rb
index feda25b81c..b0cf98121a 100644
--- a/engines/dfc_provider/lib/dfc_provider.rb
+++ b/engines/dfc_provider/lib/dfc_provider.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "dfc_provider/engine"
 
 module DfcProvider
diff --git a/engines/dfc_provider/lib/dfc_provider/engine.rb b/engines/dfc_provider/lib/dfc_provider/engine.rb
index 9ad5163c30..fedaef351a 100644
--- a/engines/dfc_provider/lib/dfc_provider/engine.rb
+++ b/engines/dfc_provider/lib/dfc_provider/engine.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module DfcProvider
   class Engine < ::Rails::Engine
     isolate_namespace DfcProvider
diff --git a/engines/dfc_provider/lib/dfc_provider/version.rb b/engines/dfc_provider/lib/dfc_provider/version.rb
index bfe289fbeb..3b891391e3 100644
--- a/engines/dfc_provider/lib/dfc_provider/version.rb
+++ b/engines/dfc_provider/lib/dfc_provider/version.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module DfcProvider
-  VERSION = "0.0.1"
+  VERSION = '0.0.1'
 end