Add hook for automatic pagination links. (#35)

Author: beauby

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

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