jsonapi add jsonapi_paginate method

lib/jsonapi/pagination.rb

@@ -57,6 +57,7 @@ def jsonapi_pagination(resources)
     #
     # @return [Hash] with the first, previous, next, current, last page numbers
     def jsonapi_pagination_builder(resources)
+      return @_numbers if @_numbers
       return {} unless JSONAPI::Rails.is_collection?(resources)
 
       _, limit, page = jsonapi_pagination_params
@@ -95,7 +96,7 @@ def jsonapi_pagination_builder(resources)
         numbers[:total_page] = last_page
       end
 
-      numbers
+      @_numbers = numbers
     end
 
     def jsonapi_pagination_meta(resources)

lib/jsonapi/rails.rb

@@ -4,14 +4,21 @@
 # Rails integration
 module JSONAPI
   module Rails
-    JSONAPI_METHODS_MAPPING = {
+    JSONAPI_PAGINATE_METHODS_MAPPING = {
       meta: :jsonapi_meta,
       links: :jsonapi_pagination,
       fields: :jsonapi_fields,
       include: :jsonapi_include,
       params: :jsonapi_serializer_params
     }
 
+    JSONAPI_METHODS_MAPPING = {
+      meta: :jsonapi_meta,
+      fields: :jsonapi_fields,
+      include: :jsonapi_include,
+      params: :jsonapi_serializer_params
+    }
+
     # Updates the mime types and registers the renderers
     #
     # @return [NilClass]
@@ -89,6 +96,35 @@ def self.add_errors_renderer!
     #
     # @return [NilClass]
     def self.add_renderer!
+      ActionController::Renderers.add(:jsonapi_paginate) do |resource, options|
+        self.content_type ||= Mime[:jsonapi]
+
+        JSONAPI_PAGINATE_METHODS_MAPPING.to_a[0..1].each do |opt, method_name|
+          next unless respond_to?(method_name, true)
+          options[opt] ||= send(method_name, resource)
+        end
+
+        # If it's an empty collection, return it directly.
+        many = JSONAPI::Rails.is_collection?(resource, options[:is_collection])
+        if many && !resource.any?
+          return options.slice(:meta, :links).merge(data: []).to_json
+        end
+
+        JSONAPI_PAGINATE_METHODS_MAPPING.to_a[2..-1].each do |opt, method_name|
+          options[opt] ||= send(method_name) if respond_to?(method_name, true)
+        end
+
+        if respond_to?(:jsonapi_serializer_class, true)
+          serializer_class = jsonapi_serializer_class(resource, many)
+        else
+          serializer_class = JSONAPI::Rails.serializer_class(resource, many)
+        end
+
+        JSONAPI::Rails.serializer_to_json(
+          serializer_class.new(resource, options)
+        )
+      end
+
       ActionController::Renderers.add(:jsonapi) do |resource, options|
         self.content_type ||= Mime[:jsonapi]
 
@@ -117,6 +153,7 @@ def self.add_renderer!
           serializer_class.new(resource, options)
         )
       end
+
     end
 
     # Checks if an object is a collection

lib/jsonapi/version.rb

@@ -1,3 +1,3 @@
 module JSONAPI
-  VERSION = '2.0.0'
+  VERSION = '2.1.0'
 end