From 8fc7474e5d4b5a8419811c05a53055439e88e7ea Mon Sep 17 00:00:00 2001
From: Lucas <lucas.hosseini@gmail.com>
Date: Sat, 15 Jul 2017 07:12:42 +0200
Subject: [PATCH] Add hook for automatic pagination links.

---
 lib/jsonapi/rails/action_controller.rb | 4 ++++
 lib/jsonapi/rails/railtie.rb           | 6 ++++++
 2 files changed, 10 insertions(+)

diff --git a/lib/jsonapi/rails/action_controller.rb b/lib/jsonapi/rails/action_controller.rb
index 746f423..67716bc 100644
--- a/lib/jsonapi/rails/action_controller.rb
+++ b/lib/jsonapi/rails/action_controller.rb
@@ -42,6 +42,10 @@ def deserializable_resource(key, options = {}, &block)
         end
       end
 
+      def jsonapi_pagination(_collection)
+        nil
+      end
+
       def jsonapi_pointers
         request.env[JSONAPI_POINTERS_KEY]
       end
diff --git a/lib/jsonapi/rails/railtie.rb b/lib/jsonapi/rails/railtie.rb
index 4653642..4a46d65 100644
--- a/lib/jsonapi/rails/railtie.rb
+++ b/lib/jsonapi/rails/railtie.rb
@@ -30,6 +30,12 @@ class Railtie < ::Rails::Railtie
           ::ActionController::Renderers.add(:jsonapi) do |resources, options|
             self.content_type ||= Mime[:jsonapi]
 
+            # Renderer proc is evaluated in the controller context, so it
+            # has access to the jsonapi_pagination method.
+            if (pagination_links = jsonapi_pagination(resources))
+              (options[:links] ||= {}).merge!(pagination_links)
+            end
+
             RENDERERS[:jsonapi].render(resources, options).to_json
           end